#define DEBUG_TYPE "simplify-libcalls"
#include "llvm/Transforms/Scalar.h"
+#include "llvm/Transforms/Utils/BuildLibCalls.h"
+#include "llvm/IRBuilder.h"
#include "llvm/Intrinsics.h"
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/Pass.h"
-#include "llvm/Support/IRBuilder.h"
-#include "llvm/Analysis/ValueTracking.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/SmallPtrSet.h"
-#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Support/CommandLine.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/raw_ostream.h"
-#include "llvm/Config/config.h"
+#include "llvm/DataLayout.h"
+#include "llvm/Target/TargetLibraryInfo.h"
+#include "llvm/Config/config.h" // FIXME: Shouldn't depend on host!
using namespace llvm;
STATISTIC(NumSimplified, "Number of library calls simplified");
STATISTIC(NumAnnotated, "Number of attributes added to library functions");
+static cl::opt<bool> UnsafeFPShrink("enable-double-float-shrink", cl::Hidden,
+ cl::init(false),
+ cl::desc("Enable unsafe double to float "
+ "shrinking for math lib calls"));
//===----------------------------------------------------------------------===//
// Optimizer Base Class
//===----------------------------------------------------------------------===//
class LibCallOptimization {
protected:
Function *Caller;
- const TargetData *TD;
+ const DataLayout *TD;
+ const TargetLibraryInfo *TLI;
LLVMContext* Context;
public:
LibCallOptimization() { }
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B)
=0;
- Value *OptimizeCall(CallInst *CI, const TargetData *TD, IRBuilder<> &B) {
+ Value *OptimizeCall(CallInst *CI, const DataLayout *TD,
+ const TargetLibraryInfo *TLI, IRBuilder<> &B) {
Caller = CI->getParent()->getParent();
this->TD = TD;
+ this->TLI = TLI;
if (CI->getCalledFunction())
Context = &CI->getCalledFunction()->getContext();
- return CallOptimizer(CI->getCalledFunction(), CI, B);
- }
- /// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*.
- Value *CastToCStr(Value *V, IRBuilder<> &B);
-
- /// EmitStrLen - Emit a call to the strlen function to the builder, for the
- /// specified pointer. Ptr is required to be some pointer type, and the
- /// return value has 'intptr_t' type.
- Value *EmitStrLen(Value *Ptr, IRBuilder<> &B);
-
- /// EmitStrChr - Emit a call to the strchr function to the builder, for the
- /// specified pointer and character. Ptr is required to be some pointer type,
- /// and the return value has 'i8*' type.
- Value *EmitStrChr(Value *Ptr, char C, IRBuilder<> &B);
-
- /// EmitStrCpy - Emit a call to the strcpy function to the builder, for the
- /// specified pointer arguments.
- Value *EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B);
-
- /// EmitMemCpy - Emit a call to the memcpy function to the builder. This
- /// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
- Value *EmitMemCpy(Value *Dst, Value *Src, Value *Len,
- unsigned Align, IRBuilder<> &B);
-
- /// EmitMemMove - Emit a call to the memmove function to the builder. This
- /// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
- Value *EmitMemMove(Value *Dst, Value *Src, Value *Len,
- unsigned Align, IRBuilder<> &B);
-
- /// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is
- /// a pointer, Val is an i32 value, and Len is an 'intptr_t' value.
- Value *EmitMemChr(Value *Ptr, Value *Val, Value *Len, IRBuilder<> &B);
-
- /// EmitMemCmp - Emit a call to the memcmp function.
- Value *EmitMemCmp(Value *Ptr1, Value *Ptr2, Value *Len, IRBuilder<> &B);
-
- /// EmitMemSet - Emit a call to the memset function
- Value *EmitMemSet(Value *Dst, Value *Val, Value *Len, IRBuilder<> &B);
-
- /// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name'
- /// (e.g. 'floor'). This function is known to take a single of type matching
- /// 'Op' and returns one value with the same type. If 'Op' is a long double,
- /// 'l' is added as the suffix of name, if 'Op' is a float, we add a 'f'
- /// suffix.
- Value *EmitUnaryFloatFnCall(Value *Op, const char *Name, IRBuilder<> &B,
- const AttrListPtr &Attrs);
-
- /// EmitPutChar - Emit a call to the putchar function. This assumes that Char
- /// is an integer.
- Value *EmitPutChar(Value *Char, IRBuilder<> &B);
-
- /// EmitPutS - Emit a call to the puts function. This assumes that Str is
- /// some pointer.
- void EmitPutS(Value *Str, IRBuilder<> &B);
-
- /// EmitFPutC - Emit a call to the fputc function. This assumes that Char is
- /// an i32, and File is a pointer to FILE.
- void EmitFPutC(Value *Char, Value *File, IRBuilder<> &B);
-
- /// EmitFPutS - Emit a call to the puts function. Str is required to be a
- /// pointer and File is a pointer to FILE.
- void EmitFPutS(Value *Str, Value *File, IRBuilder<> &B);
-
- /// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is
- /// a pointer, Size is an 'intptr_t', and File is a pointer to FILE.
- void EmitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &B);
+ // We never change the calling convention.
+ if (CI->getCallingConv() != llvm::CallingConv::C)
+ return NULL;
+ return CallOptimizer(CI->getCalledFunction(), CI, B);
+ }
};
} // End anonymous namespace.
-/// CastToCStr - Return V if it is an i8*, otherwise cast it to i8*.
-Value *LibCallOptimization::CastToCStr(Value *V, IRBuilder<> &B) {
- return B.CreateBitCast(V, Type::getInt8PtrTy(*Context), "cstr");
-}
-
-/// EmitStrLen - Emit a call to the strlen function to the builder, for the
-/// specified pointer. This always returns an integer value of size intptr_t.
-Value *LibCallOptimization::EmitStrLen(Value *Ptr, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[2];
- AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
- Attribute::NoUnwind);
-
- Constant *StrLen =M->getOrInsertFunction("strlen", AttrListPtr::get(AWI, 2),
- TD->getIntPtrType(*Context),
- Type::getInt8PtrTy(*Context),
- NULL);
- CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen");
- if (const Function *F = dyn_cast<Function>(StrLen->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
-
- return CI;
-}
-
-/// EmitStrChr - Emit a call to the strchr function to the builder, for the
-/// specified pointer and character. Ptr is required to be some pointer type,
-/// and the return value has 'i8*' type.
-Value *LibCallOptimization::EmitStrChr(Value *Ptr, char C, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI =
- AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
-
- const Type *I8Ptr = Type::getInt8PtrTy(*Context);
- const Type *I32Ty = Type::getInt32Ty(*Context);
- Constant *StrChr = M->getOrInsertFunction("strchr", AttrListPtr::get(&AWI, 1),
- I8Ptr, I8Ptr, I32Ty, NULL);
- CallInst *CI = B.CreateCall2(StrChr, CastToCStr(Ptr, B),
- ConstantInt::get(I32Ty, C), "strchr");
- if (const Function *F = dyn_cast<Function>(StrChr->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
- return CI;
-}
-
-/// EmitStrCpy - Emit a call to the strcpy function to the builder, for the
-/// specified pointer arguments.
-Value *LibCallOptimization::EmitStrCpy(Value *Dst, Value *Src, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[2];
- AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
- const Type *I8Ptr = Type::getInt8PtrTy(*Context);
- Value *StrCpy = M->getOrInsertFunction("strcpy", AttrListPtr::get(AWI, 2),
- I8Ptr, I8Ptr, I8Ptr, NULL);
- CallInst *CI = B.CreateCall2(StrCpy, CastToCStr(Dst, B), CastToCStr(Src, B),
- "strcpy");
- if (const Function *F = dyn_cast<Function>(StrCpy->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
- return CI;
-}
-
-/// EmitMemCpy - Emit a call to the memcpy function to the builder. This always
-/// expects that the size has type 'intptr_t' and Dst/Src are pointers.
-Value *LibCallOptimization::EmitMemCpy(Value *Dst, Value *Src, Value *Len,
- unsigned Align, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- const Type *Ty = Len->getType();
- Value *MemCpy = Intrinsic::getDeclaration(M, Intrinsic::memcpy, &Ty, 1);
- Dst = CastToCStr(Dst, B);
- Src = CastToCStr(Src, B);
- return B.CreateCall4(MemCpy, Dst, Src, Len,
- ConstantInt::get(Type::getInt32Ty(*Context), Align));
-}
-
-/// EmitMemMove - Emit a call to the memmove function to the builder. This
-/// always expects that the size has type 'intptr_t' and Dst/Src are pointers.
-Value *LibCallOptimization::EmitMemMove(Value *Dst, Value *Src, Value *Len,
- unsigned Align, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- const Type *Ty = TD->getIntPtrType(*Context);
- Value *MemMove = Intrinsic::getDeclaration(M, Intrinsic::memmove, &Ty, 1);
- Dst = CastToCStr(Dst, B);
- Src = CastToCStr(Src, B);
- Value *A = ConstantInt::get(Type::getInt32Ty(*Context), Align);
- return B.CreateCall4(MemMove, Dst, Src, Len, A);
-}
-
-/// EmitMemChr - Emit a call to the memchr function. This assumes that Ptr is
-/// a pointer, Val is an i32 value, and Len is an 'intptr_t' value.
-Value *LibCallOptimization::EmitMemChr(Value *Ptr, Value *Val,
- Value *Len, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI;
- AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
-
- Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1),
- Type::getInt8PtrTy(*Context),
- Type::getInt8PtrTy(*Context),
- Type::getInt32Ty(*Context),
- TD->getIntPtrType(*Context),
- NULL);
- CallInst *CI = B.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr");
-
- if (const Function *F = dyn_cast<Function>(MemChr->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
-
- return CI;
-}
-
-/// EmitMemCmp - Emit a call to the memcmp function.
-Value *LibCallOptimization::EmitMemCmp(Value *Ptr1, Value *Ptr2,
- Value *Len, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[3];
- AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
- AWI[2] = AttributeWithIndex::get(~0u, Attribute::ReadOnly |
- Attribute::NoUnwind);
-
- Value *MemCmp = M->getOrInsertFunction("memcmp", AttrListPtr::get(AWI, 3),
- Type::getInt32Ty(*Context),
- Type::getInt8PtrTy(*Context),
- Type::getInt8PtrTy(*Context),
- TD->getIntPtrType(*Context), NULL);
- CallInst *CI = B.CreateCall3(MemCmp, CastToCStr(Ptr1, B), CastToCStr(Ptr2, B),
- Len, "memcmp");
-
- if (const Function *F = dyn_cast<Function>(MemCmp->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
-
- return CI;
-}
-
-/// EmitMemSet - Emit a call to the memset function
-Value *LibCallOptimization::EmitMemSet(Value *Dst, Value *Val,
- Value *Len, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- Intrinsic::ID IID = Intrinsic::memset;
- const Type *Tys[1];
- Tys[0] = Len->getType();
- Value *MemSet = Intrinsic::getDeclaration(M, IID, Tys, 1);
- Value *Align = ConstantInt::get(Type::getInt32Ty(*Context), 1);
- return B.CreateCall4(MemSet, CastToCStr(Dst, B), Val, Len, Align);
-}
-
-/// EmitUnaryFloatFnCall - Emit a call to the unary function named 'Name' (e.g.
-/// 'floor'). This function is known to take a single of type matching 'Op' and
-/// returns one value with the same type. If 'Op' is a long double, 'l' is
-/// added as the suffix of name, if 'Op' is a float, we add a 'f' suffix.
-Value *LibCallOptimization::EmitUnaryFloatFnCall(Value *Op, const char *Name,
- IRBuilder<> &B,
- const AttrListPtr &Attrs) {
- char NameBuffer[20];
- if (!Op->getType()->isDoubleTy()) {
- // If we need to add a suffix, copy into NameBuffer.
- unsigned NameLen = strlen(Name);
- assert(NameLen < sizeof(NameBuffer)-2);
- memcpy(NameBuffer, Name, NameLen);
- if (Op->getType()->isFloatTy())
- NameBuffer[NameLen] = 'f'; // floorf
- else
- NameBuffer[NameLen] = 'l'; // floorl
- NameBuffer[NameLen+1] = 0;
- Name = NameBuffer;
- }
-
- Module *M = Caller->getParent();
- Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
- Op->getType(), NULL);
- CallInst *CI = B.CreateCall(Callee, Op, Name);
- CI->setAttributes(Attrs);
- if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
-
- return CI;
-}
-
-/// EmitPutChar - Emit a call to the putchar function. This assumes that Char
-/// is an integer.
-Value *LibCallOptimization::EmitPutChar(Value *Char, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- Value *PutChar = M->getOrInsertFunction("putchar", Type::getInt32Ty(*Context),
- Type::getInt32Ty(*Context), NULL);
- CallInst *CI = B.CreateCall(PutChar,
- B.CreateIntCast(Char,
- Type::getInt32Ty(*Context),
- /*isSigned*/true,
- "chari"),
- "putchar");
-
- if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
- return CI;
-}
-
-/// EmitPutS - Emit a call to the puts function. This assumes that Str is
-/// some pointer.
-void LibCallOptimization::EmitPutS(Value *Str, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[2];
- AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
-
- Value *PutS = M->getOrInsertFunction("puts", AttrListPtr::get(AWI, 2),
- Type::getInt32Ty(*Context),
- Type::getInt8PtrTy(*Context),
- NULL);
- CallInst *CI = B.CreateCall(PutS, CastToCStr(Str, B), "puts");
- if (const Function *F = dyn_cast<Function>(PutS->stripPointerCasts()))
- CI->setCallingConv(F->getCallingConv());
-
-}
-
-/// EmitFPutC - Emit a call to the fputc function. This assumes that Char is
-/// an integer and File is a pointer to FILE.
-void LibCallOptimization::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[2];
- AWI[0] = AttributeWithIndex::get(2, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
- Constant *F;
- if (isa<PointerType>(File->getType()))
- F = M->getOrInsertFunction("fputc", AttrListPtr::get(AWI, 2),
- Type::getInt32Ty(*Context),
- Type::getInt32Ty(*Context), File->getType(),
- NULL);
- else
- F = M->getOrInsertFunction("fputc",
- Type::getInt32Ty(*Context),
- Type::getInt32Ty(*Context),
- File->getType(), NULL);
- Char = B.CreateIntCast(Char, Type::getInt32Ty(*Context), /*isSigned*/true,
- "chari");
- CallInst *CI = B.CreateCall2(F, Char, File, "fputc");
-
- if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
- CI->setCallingConv(Fn->getCallingConv());
-}
-
-/// EmitFPutS - Emit a call to the puts function. Str is required to be a
-/// pointer and File is a pointer to FILE.
-void LibCallOptimization::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[3];
- AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(2, Attribute::NoCapture);
- AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
- Constant *F;
- if (isa<PointerType>(File->getType()))
- F = M->getOrInsertFunction("fputs", AttrListPtr::get(AWI, 3),
- Type::getInt32Ty(*Context),
- Type::getInt8PtrTy(*Context),
- File->getType(), NULL);
- else
- F = M->getOrInsertFunction("fputs", Type::getInt32Ty(*Context),
- Type::getInt8PtrTy(*Context),
- File->getType(), NULL);
- CallInst *CI = B.CreateCall2(F, CastToCStr(Str, B), File, "fputs");
-
- if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
- CI->setCallingConv(Fn->getCallingConv());
-}
-
-/// EmitFWrite - Emit a call to the fwrite function. This assumes that Ptr is
-/// a pointer, Size is an 'intptr_t', and File is a pointer to FILE.
-void LibCallOptimization::EmitFWrite(Value *Ptr, Value *Size, Value *File,
- IRBuilder<> &B) {
- Module *M = Caller->getParent();
- AttributeWithIndex AWI[3];
- AWI[0] = AttributeWithIndex::get(1, Attribute::NoCapture);
- AWI[1] = AttributeWithIndex::get(4, Attribute::NoCapture);
- AWI[2] = AttributeWithIndex::get(~0u, Attribute::NoUnwind);
- Constant *F;
- if (isa<PointerType>(File->getType()))
- F = M->getOrInsertFunction("fwrite", AttrListPtr::get(AWI, 3),
- TD->getIntPtrType(*Context),
- Type::getInt8PtrTy(*Context),
- TD->getIntPtrType(*Context),
- TD->getIntPtrType(*Context),
- File->getType(), NULL);
- else
- F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(*Context),
- Type::getInt8PtrTy(*Context),
- TD->getIntPtrType(*Context),
- TD->getIntPtrType(*Context),
- File->getType(), NULL);
- CallInst *CI = B.CreateCall4(F, CastToCStr(Ptr, B), Size,
- ConstantInt::get(TD->getIntPtrType(*Context), 1), File);
-
- if (const Function *Fn = dyn_cast<Function>(F->stripPointerCasts()))
- CI->setCallingConv(Fn->getCallingConv());
-}
//===----------------------------------------------------------------------===//
// Helper Functions
//===----------------------------------------------------------------------===//
-/// GetStringLengthH - If we can compute the length of the string pointed to by
-/// the specified pointer, return 'len+1'. If we can't, return 0.
-static uint64_t GetStringLengthH(Value *V, SmallPtrSet<PHINode*, 32> &PHIs) {
- // Look through noop bitcast instructions.
- if (BitCastInst *BCI = dyn_cast<BitCastInst>(V))
- return GetStringLengthH(BCI->getOperand(0), PHIs);
-
- // If this is a PHI node, there are two cases: either we have already seen it
- // or we haven't.
- if (PHINode *PN = dyn_cast<PHINode>(V)) {
- if (!PHIs.insert(PN))
- return ~0ULL; // already in the set.
-
- // If it was new, see if all the input strings are the same length.
- uint64_t LenSoFar = ~0ULL;
- for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
- uint64_t Len = GetStringLengthH(PN->getIncomingValue(i), PHIs);
- if (Len == 0) return 0; // Unknown length -> unknown.
-
- if (Len == ~0ULL) continue;
-
- if (Len != LenSoFar && LenSoFar != ~0ULL)
- return 0; // Disagree -> unknown.
- LenSoFar = Len;
- }
-
- // Success, all agree.
- return LenSoFar;
- }
-
- // strlen(select(c,x,y)) -> strlen(x) ^ strlen(y)
- if (SelectInst *SI = dyn_cast<SelectInst>(V)) {
- uint64_t Len1 = GetStringLengthH(SI->getTrueValue(), PHIs);
- if (Len1 == 0) return 0;
- uint64_t Len2 = GetStringLengthH(SI->getFalseValue(), PHIs);
- if (Len2 == 0) return 0;
- if (Len1 == ~0ULL) return Len2;
- if (Len2 == ~0ULL) return Len1;
- if (Len1 != Len2) return 0;
- return Len1;
- }
-
- // If the value is not a GEP instruction nor a constant expression with a
- // GEP instruction, then return unknown.
- User *GEP = 0;
- if (GetElementPtrInst *GEPI = dyn_cast<GetElementPtrInst>(V)) {
- GEP = GEPI;
- } else if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V)) {
- if (CE->getOpcode() != Instruction::GetElementPtr)
- return 0;
- GEP = CE;
- } else {
- return 0;
- }
-
- // Make sure the GEP has exactly three arguments.
- if (GEP->getNumOperands() != 3)
- return 0;
-
- // Check to make sure that the first operand of the GEP is an integer and
- // has value 0 so that we are sure we're indexing into the initializer.
- if (ConstantInt *Idx = dyn_cast<ConstantInt>(GEP->getOperand(1))) {
- if (!Idx->isZero())
- return 0;
- } else
- return 0;
-
- // If the second index isn't a ConstantInt, then this is a variable index
- // into the array. If this occurs, we can't say anything meaningful about
- // the string.
- uint64_t StartIdx = 0;
- if (ConstantInt *CI = dyn_cast<ConstantInt>(GEP->getOperand(2)))
- StartIdx = CI->getZExtValue();
- else
- return 0;
-
- // The GEP instruction, constant or instruction, must reference a global
- // variable that is a constant and is initialized. The referenced constant
- // initializer is the array that we'll use for optimization.
- GlobalVariable* GV = dyn_cast<GlobalVariable>(GEP->getOperand(0));
- if (!GV || !GV->isConstant() || !GV->hasInitializer() ||
- GV->mayBeOverridden())
- return 0;
- Constant *GlobalInit = GV->getInitializer();
-
- // Handle the ConstantAggregateZero case, which is a degenerate case. The
- // initializer is constant zero so the length of the string must be zero.
- if (isa<ConstantAggregateZero>(GlobalInit))
- return 1; // Len = 0 offset by 1.
-
- // Must be a Constant Array
- ConstantArray *Array = dyn_cast<ConstantArray>(GlobalInit);
- if (!Array || !Array->getType()->getElementType()->isInteger(8))
- return false;
-
- // Get the number of elements in the array
- uint64_t NumElts = Array->getType()->getNumElements();
-
- // Traverse the constant array from StartIdx (derived above) which is
- // the place the GEP refers to in the array.
- for (unsigned i = StartIdx; i != NumElts; ++i) {
- Constant *Elt = Array->getOperand(i);
- ConstantInt *CI = dyn_cast<ConstantInt>(Elt);
- if (!CI) // This array isn't suitable, non-int initializer.
- return 0;
- if (CI->isZero())
- return i-StartIdx+1; // We found end of string, success!
- }
-
- return 0; // The array isn't null terminated, conservatively return 'unknown'.
-}
-
-/// GetStringLength - If we can compute the length of the string pointed to by
-/// the specified pointer, return 'len+1'. If we can't, return 0.
-static uint64_t GetStringLength(Value *V) {
- if (!isa<PointerType>(V->getType())) return 0;
-
- SmallPtrSet<PHINode*, 32> PHIs;
- uint64_t Len = GetStringLengthH(V, PHIs);
- // If Len is ~0ULL, we had an infinite phi cycle: this is dead code, so return
- // an empty string as a length.
- return Len == ~0ULL ? 1 : Len;
-}
-
/// IsOnlyUsedInZeroEqualityComparison - Return true if it only matters that the
/// value is equal or not-equal to zero.
static bool IsOnlyUsedInZeroEqualityComparison(Value *V) {
return true;
}
+static bool CallHasFloatingPointArgument(const CallInst *CI) {
+ for (CallInst::const_op_iterator it = CI->op_begin(), e = CI->op_end();
+ it != e; ++it) {
+ if ((*it)->getType()->isFloatingPointTy())
+ return true;
+ }
+ return false;
+}
+
+/// IsOnlyUsedInEqualityComparison - Return true if it is only used in equality
+/// comparisons with With.
+static bool IsOnlyUsedInEqualityComparison(Value *V, Value *With) {
+ for (Value::use_iterator UI = V->use_begin(), E = V->use_end();
+ UI != E; ++UI) {
+ if (ICmpInst *IC = dyn_cast<ICmpInst>(*UI))
+ if (IC->isEquality() && IC->getOperand(1) == With)
+ continue;
+ // Unknown instruction.
+ return false;
+ }
+ return true;
+}
+
//===----------------------------------------------------------------------===//
// String and Memory LibCall Optimizations
//===----------------------------------------------------------------------===//
-//===---------------------------------------===//
-// 'strcat' Optimizations
namespace {
-struct StrCatOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strcat" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
- FT->getParamType(0) != FT->getReturnType() ||
- FT->getParamType(1) != FT->getReturnType())
- return 0;
-
- // Extract some information from the instruction
- Value *Dst = CI->getOperand(1);
- Value *Src = CI->getOperand(2);
-
- // See if we can get the length of the input string.
- uint64_t Len = GetStringLength(Src);
- if (Len == 0) return 0;
- --Len; // Unbias length.
-
- // Handle the simple, do-nothing case: strcat(x, "") -> x
- if (Len == 0)
- return Dst;
-
- // These optimizations require TargetData.
- if (!TD) return 0;
-
- EmitStrLenMemCpy(Src, Dst, Len, B);
- return Dst;
- }
-
- void EmitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B) {
- // We need to find the end of the destination string. That's where the
- // memory is to be moved to. We just generate a call to strlen.
- Value *DstLen = EmitStrLen(Dst, B);
-
- // Now that we have the destination's length, we must index into the
- // destination's pointer to get the actual memcpy destination (end of
- // the string .. we're concatenating).
- Value *CpyDst = B.CreateGEP(Dst, DstLen, "endptr");
-
- // We have enough information to now generate the memcpy call to do the
- // concatenation for us. Make a memcpy to copy the nul byte with align = 1.
- EmitMemCpy(CpyDst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len+1), 1, B);
- }
-};
-
//===---------------------------------------===//
-// 'strncat' Optimizations
+// 'strcpy' Optimizations
-struct StrNCatOpt : public StrCatOpt {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strncat" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 3 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
- FT->getParamType(0) != FT->getReturnType() ||
- FT->getParamType(1) != FT->getReturnType() ||
- !isa<IntegerType>(FT->getParamType(2)))
- return 0;
+struct StrCpyOpt : public LibCallOptimization {
+ bool OptChkCall; // True if it's optimizing a __strcpy_chk libcall.
- // Extract some information from the instruction
- Value *Dst = CI->getOperand(1);
- Value *Src = CI->getOperand(2);
- uint64_t Len;
+ StrCpyOpt(bool c) : OptChkCall(c) {}
- // We don't do anything if length is not constant
- if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getOperand(3)))
- Len = LengthArg->getZExtValue();
- else
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Verify the "strcpy" function prototype.
+ unsigned NumParams = OptChkCall ? 3 : 2;
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != NumParams ||
+ FT->getReturnType() != FT->getParamType(0) ||
+ FT->getParamType(0) != FT->getParamType(1) ||
+ FT->getParamType(0) != B.getInt8PtrTy())
return 0;
- // See if we can get the length of the input string.
- uint64_t SrcLen = GetStringLength(Src);
- if (SrcLen == 0) return 0;
- --SrcLen; // Unbias length.
-
- // Handle the simple, do-nothing cases:
- // strncat(x, "", c) -> x
- // strncat(x, c, 0) -> x
- if (SrcLen == 0 || Len == 0) return Dst;
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) // strcpy(x,x) -> x
+ return Src;
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
- // We don't optimize this case
- if (Len < SrcLen) return 0;
+ // See if we can get the length of the input string.
+ uint64_t Len = GetStringLength(Src);
+ if (Len == 0) return 0;
- // strncat(x, s, c) -> strcat(x, s)
- // s is constant so the strcat can be optimized further
- EmitStrLenMemCpy(Src, Dst, SrcLen, B);
+ // We have enough information to now generate the memcpy call to do the
+ // concatenation for us. Make a memcpy to copy the nul byte with align = 1.
+ if (!OptChkCall ||
+ !EmitMemCpyChk(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len),
+ CI->getArgOperand(2), B, TD, TLI))
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len), 1);
return Dst;
}
};
//===---------------------------------------===//
-// 'strchr' Optimizations
-
-struct StrChrOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strchr" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 ||
- FT->getReturnType() != Type::getInt8PtrTy(*Context) ||
- FT->getParamType(0) != FT->getReturnType())
- return 0;
-
- Value *SrcStr = CI->getOperand(1);
-
- // If the second operand is non-constant, see if we can compute the length
- // of the input string and turn this into memchr.
- ConstantInt *CharC = dyn_cast<ConstantInt>(CI->getOperand(2));
- if (CharC == 0) {
- // These optimizations require TargetData.
- if (!TD) return 0;
-
- uint64_t Len = GetStringLength(SrcStr);
- if (Len == 0 || !FT->getParamType(1)->isInteger(32)) // memchr needs i32.
- return 0;
-
- return EmitMemChr(SrcStr, CI->getOperand(2), // include nul.
- ConstantInt::get(TD->getIntPtrType(*Context), Len), B);
- }
-
- // Otherwise, the character is a constant, see if the first argument is
- // a string literal. If so, we can constant fold.
- std::string Str;
- if (!GetConstantStringInfo(SrcStr, Str))
- return 0;
-
- // strchr can find the nul character.
- Str += '\0';
- char CharValue = CharC->getSExtValue();
+// 'stpcpy' Optimizations
- // Compute the offset.
- uint64_t i = 0;
- while (1) {
- if (i == Str.size()) // Didn't find the char. strchr returns null.
- return Constant::getNullValue(CI->getType());
- // Did we find our match?
- if (Str[i] == CharValue)
- break;
- ++i;
- }
-
- // strchr(s+n,c) -> gep(s+n+i,c)
- Value *Idx = ConstantInt::get(Type::getInt64Ty(*Context), i);
- return B.CreateGEP(SrcStr, Idx, "strchr");
- }
-};
+struct StpCpyOpt: public LibCallOptimization {
+ bool OptChkCall; // True if it's optimizing a __stpcpy_chk libcall.
-//===---------------------------------------===//
-// 'strcmp' Optimizations
+ StpCpyOpt(bool c) : OptChkCall(c) {}
-struct StrCmpOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strcmp" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 ||
- !FT->getReturnType()->isInteger(32) ||
+ // Verify the "stpcpy" function prototype.
+ unsigned NumParams = OptChkCall ? 3 : 2;
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != NumParams ||
+ FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context))
+ FT->getParamType(0) != B.getInt8PtrTy())
return 0;
- Value *Str1P = CI->getOperand(1), *Str2P = CI->getOperand(2);
- if (Str1P == Str2P) // strcmp(x,x) -> 0
- return ConstantInt::get(CI->getType(), 0);
-
- std::string Str1, Str2;
- bool HasStr1 = GetConstantStringInfo(Str1P, Str1);
- bool HasStr2 = GetConstantStringInfo(Str2P, Str2);
-
- if (HasStr1 && Str1.empty()) // strcmp("", x) -> *x
- return B.CreateZExt(B.CreateLoad(Str2P, "strcmpload"), CI->getType());
-
- if (HasStr2 && Str2.empty()) // strcmp(x,"") -> *x
- return B.CreateZExt(B.CreateLoad(Str1P, "strcmpload"), CI->getType());
-
- // strcmp(x, y) -> cnst (if both x and y are constant strings)
- if (HasStr1 && HasStr2)
- return ConstantInt::get(CI->getType(),
- strcmp(Str1.c_str(),Str2.c_str()));
-
- // strcmp(P, "x") -> memcmp(P, "x", 2)
- uint64_t Len1 = GetStringLength(Str1P);
- uint64_t Len2 = GetStringLength(Str2P);
- if (Len1 && Len2) {
- // These optimizations require TargetData.
- if (!TD) return 0;
+ // These optimizations require DataLayout.
+ if (!TD) return 0;
- return EmitMemCmp(Str1P, Str2P,
- ConstantInt::get(TD->getIntPtrType(*Context),
- std::min(Len1, Len2)), B);
+ Value *Dst = CI->getArgOperand(0), *Src = CI->getArgOperand(1);
+ if (Dst == Src) { // stpcpy(x,x) -> x+strlen(x)
+ Value *StrLen = EmitStrLen(Src, B, TD, TLI);
+ return StrLen ? B.CreateInBoundsGEP(Dst, StrLen) : 0;
}
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'strncmp' Optimizations
-
-struct StrNCmpOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strncmp" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 3 ||
- !FT->getReturnType()->isInteger(32) ||
- FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
- !isa<IntegerType>(FT->getParamType(2)))
- return 0;
-
- Value *Str1P = CI->getOperand(1), *Str2P = CI->getOperand(2);
- if (Str1P == Str2P) // strncmp(x,x,n) -> 0
- return ConstantInt::get(CI->getType(), 0);
-
- // Get the length argument if it is constant.
- uint64_t Length;
- if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getOperand(3)))
- Length = LengthArg->getZExtValue();
- else
- return 0;
-
- if (Length == 0) // strncmp(x,y,0) -> 0
- return ConstantInt::get(CI->getType(), 0);
-
- std::string Str1, Str2;
- bool HasStr1 = GetConstantStringInfo(Str1P, Str1);
- bool HasStr2 = GetConstantStringInfo(Str2P, Str2);
-
- if (HasStr1 && Str1.empty()) // strncmp("", x, n) -> *x
- return B.CreateZExt(B.CreateLoad(Str2P, "strcmpload"), CI->getType());
-
- if (HasStr2 && Str2.empty()) // strncmp(x, "", n) -> *x
- return B.CreateZExt(B.CreateLoad(Str1P, "strcmpload"), CI->getType());
-
- // strncmp(x, y) -> cnst (if both x and y are constant strings)
- if (HasStr1 && HasStr2)
- return ConstantInt::get(CI->getType(),
- strncmp(Str1.c_str(), Str2.c_str(), Length));
- return 0;
- }
-};
-
-
-//===---------------------------------------===//
-// 'strcpy' Optimizations
-
-struct StrCpyOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Verify the "strcpy" function prototype.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || FT->getReturnType() != FT->getParamType(0) ||
- FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context))
- return 0;
-
- Value *Dst = CI->getOperand(1), *Src = CI->getOperand(2);
- if (Dst == Src) // strcpy(x,x) -> x
- return Src;
-
- // These optimizations require TargetData.
- if (!TD) return 0;
-
// See if we can get the length of the input string.
uint64_t Len = GetStringLength(Src);
if (Len == 0) return 0;
+ Value *LenV = ConstantInt::get(TD->getIntPtrType(*Context), Len);
+ Value *DstEnd = B.CreateGEP(Dst,
+ ConstantInt::get(TD->getIntPtrType(*Context),
+ Len - 1));
+
// We have enough information to now generate the memcpy call to do the
- // concatenation for us. Make a memcpy to copy the nul byte with align = 1.
- EmitMemCpy(Dst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len), 1, B);
- return Dst;
+ // copy for us. Make a memcpy to copy the nul byte with align = 1.
+ if (!OptChkCall || !EmitMemCpyChk(Dst, Src, LenV, CI->getArgOperand(2), B,
+ TD, TLI))
+ B.CreateMemCpy(Dst, Src, LenV, 1);
+ return DstEnd;
}
};
struct StrNCpyOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
- !isa<IntegerType>(FT->getParamType(2)))
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ !FT->getParamType(2)->isIntegerTy())
return 0;
- Value *Dst = CI->getOperand(1);
- Value *Src = CI->getOperand(2);
- Value *LenOp = CI->getOperand(3);
+ Value *Dst = CI->getArgOperand(0);
+ Value *Src = CI->getArgOperand(1);
+ Value *LenOp = CI->getArgOperand(2);
// See if we can get the length of the input string.
uint64_t SrcLen = GetStringLength(Src);
if (SrcLen == 0) {
// strncpy(x, "", y) -> memset(x, '\0', y, 1)
- EmitMemSet(Dst, ConstantInt::get(Type::getInt8Ty(*Context), '\0'), LenOp,
- B);
+ B.CreateMemSet(Dst, B.getInt8('\0'), LenOp, 1);
return Dst;
}
if (Len == 0) return Dst; // strncpy(x, y, 0) -> x
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
// Let strncpy handle the zero padding
if (Len > SrcLen+1) return 0;
// strncpy(x, s, c) -> memcpy(x, s, c, 1) [s and c are constant]
- EmitMemCpy(Dst, Src,
- ConstantInt::get(TD->getIntPtrType(*Context), Len), 1, B);
+ B.CreateMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len), 1);
return Dst;
}
struct StrLenOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 1 ||
- FT->getParamType(0) != Type::getInt8PtrTy(*Context) ||
- !isa<IntegerType>(FT->getReturnType()))
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ !FT->getReturnType()->isIntegerTy())
return 0;
- Value *Src = CI->getOperand(1);
+ Value *Src = CI->getArgOperand(0);
// Constant folding: strlen("xyz") -> 3
if (uint64_t Len = GetStringLength(Src))
}
};
+
+//===---------------------------------------===//
+// 'strpbrk' Optimizations
+
+struct StrPBrkOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ FT->getReturnType() != FT->getParamType(0))
+ return 0;
+
+ StringRef S1, S2;
+ bool HasS1 = getConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = getConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strpbrk(s, "") -> NULL
+ // strpbrk("", s) -> NULL
+ if ((HasS1 && S1.empty()) || (HasS2 && S2.empty()))
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2) {
+ size_t I = S1.find_first_of(S2);
+ if (I == std::string::npos) // No match.
+ return Constant::getNullValue(CI->getType());
+
+ return B.CreateGEP(CI->getArgOperand(0), B.getInt64(I), "strpbrk");
+ }
+
+ // strpbrk(s, "a") -> strchr(s, 'a')
+ if (TD && HasS2 && S2.size() == 1)
+ return EmitStrChr(CI->getArgOperand(0), S2[0], B, TD, TLI);
+
+ return 0;
+ }
+};
+
//===---------------------------------------===//
// 'strto*' Optimizations. This handles strtol, strtod, strtof, strtoul, etc.
struct StrToOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)))
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy())
return 0;
- Value *EndPtr = CI->getOperand(2);
+ Value *EndPtr = CI->getArgOperand(1);
if (isa<ConstantPointerNull>(EndPtr)) {
- CI->setOnlyReadsMemory();
- CI->addAttribute(1, Attribute::NoCapture);
+ // With a null EndPtr, this function won't capture the main argument.
+ // It would be readonly too, except that it still may write to errno.
+ CI->addAttribute(1, Attributes::get(Callee->getContext(),
+ Attributes::NoCapture));
}
return 0;
}
};
+//===---------------------------------------===//
+// 'strspn' Optimizations
+
+struct StrSpnOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ StringRef S1, S2;
+ bool HasS1 = getConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = getConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strspn(s, "") -> 0
+ // strspn("", s) -> 0
+ if ((HasS1 && S1.empty()) || (HasS2 && S2.empty()))
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2) {
+ size_t Pos = S1.find_first_not_of(S2);
+ if (Pos == StringRef::npos) Pos = S1.size();
+ return ConstantInt::get(CI->getType(), Pos);
+ }
+
+ return 0;
+ }
+};
+
+//===---------------------------------------===//
+// 'strcspn' Optimizations
+
+struct StrCSpnOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 ||
+ FT->getParamType(0) != B.getInt8PtrTy() ||
+ FT->getParamType(1) != FT->getParamType(0) ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ StringRef S1, S2;
+ bool HasS1 = getConstantStringInfo(CI->getArgOperand(0), S1);
+ bool HasS2 = getConstantStringInfo(CI->getArgOperand(1), S2);
+
+ // strcspn("", s) -> 0
+ if (HasS1 && S1.empty())
+ return Constant::getNullValue(CI->getType());
+
+ // Constant folding.
+ if (HasS1 && HasS2) {
+ size_t Pos = S1.find_first_of(S2);
+ if (Pos == StringRef::npos) Pos = S1.size();
+ return ConstantInt::get(CI->getType(), Pos);
+ }
+
+ // strcspn(s, "") -> strlen(s)
+ if (TD && HasS2 && S2.empty())
+ return EmitStrLen(CI->getArgOperand(0), B, TD, TLI);
+
+ return 0;
+ }
+};
+
//===---------------------------------------===//
// 'strstr' Optimizations
struct StrStrOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 2 ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !isa<PointerType>(FT->getReturnType()))
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isPointerTy())
return 0;
// fold strstr(x, x) -> x.
- if (CI->getOperand(1) == CI->getOperand(2))
- return B.CreateBitCast(CI->getOperand(1), CI->getType());
+ if (CI->getArgOperand(0) == CI->getArgOperand(1))
+ return B.CreateBitCast(CI->getArgOperand(0), CI->getType());
+
+ // fold strstr(a, b) == a -> strncmp(a, b, strlen(b)) == 0
+ if (TD && IsOnlyUsedInEqualityComparison(CI, CI->getArgOperand(0))) {
+ Value *StrLen = EmitStrLen(CI->getArgOperand(1), B, TD, TLI);
+ if (!StrLen)
+ return 0;
+ Value *StrNCmp = EmitStrNCmp(CI->getArgOperand(0), CI->getArgOperand(1),
+ StrLen, B, TD, TLI);
+ if (!StrNCmp)
+ return 0;
+ for (Value::use_iterator UI = CI->use_begin(), UE = CI->use_end();
+ UI != UE; ) {
+ ICmpInst *Old = cast<ICmpInst>(*UI++);
+ Value *Cmp = B.CreateICmp(Old->getPredicate(), StrNCmp,
+ ConstantInt::getNullValue(StrNCmp->getType()),
+ "cmp");
+ Old->replaceAllUsesWith(Cmp);
+ Old->eraseFromParent();
+ }
+ return CI;
+ }
// See if either input string is a constant string.
- std::string SearchStr, ToFindStr;
- bool HasStr1 = GetConstantStringInfo(CI->getOperand(1), SearchStr);
- bool HasStr2 = GetConstantStringInfo(CI->getOperand(2), ToFindStr);
+ StringRef SearchStr, ToFindStr;
+ bool HasStr1 = getConstantStringInfo(CI->getArgOperand(0), SearchStr);
+ bool HasStr2 = getConstantStringInfo(CI->getArgOperand(1), ToFindStr);
// fold strstr(x, "") -> x.
if (HasStr2 && ToFindStr.empty())
- return B.CreateBitCast(CI->getOperand(1), CI->getType());
+ return B.CreateBitCast(CI->getArgOperand(0), CI->getType());
// If both strings are known, constant fold it.
if (HasStr1 && HasStr2) {
std::string::size_type Offset = SearchStr.find(ToFindStr);
- if (Offset == std::string::npos) // strstr("foo", "bar") -> null
+ if (Offset == StringRef::npos) // strstr("foo", "bar") -> null
return Constant::getNullValue(CI->getType());
// strstr("abcd", "bc") -> gep((char*)"abcd", 1)
- Value *Result = CastToCStr(CI->getOperand(1), B);
+ Value *Result = CastToCStr(CI->getArgOperand(0), B);
Result = B.CreateConstInBoundsGEP1_64(Result, Offset, "strstr");
return B.CreateBitCast(Result, CI->getType());
}
// fold strstr(x, "y") -> strchr(x, 'y').
- if (HasStr2 && ToFindStr.size() == 1)
- return B.CreateBitCast(EmitStrChr(CI->getOperand(1), ToFindStr[0], B),
- CI->getType());
+ if (HasStr2 && ToFindStr.size() == 1) {
+ Value *StrChr= EmitStrChr(CI->getArgOperand(0), ToFindStr[0], B, TD, TLI);
+ return StrChr ? B.CreateBitCast(StrChr, CI->getType()) : 0;
+ }
return 0;
}
};
struct MemCmpOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 3 || !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !FT->getReturnType()->isInteger(32))
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 3 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy(32))
return 0;
- Value *LHS = CI->getOperand(1), *RHS = CI->getOperand(2);
+ Value *LHS = CI->getArgOperand(0), *RHS = CI->getArgOperand(1);
if (LHS == RHS) // memcmp(s,s,x) -> 0
return Constant::getNullValue(CI->getType());
// Make sure we have a constant length.
- ConstantInt *LenC = dyn_cast<ConstantInt>(CI->getOperand(3));
+ ConstantInt *LenC = dyn_cast<ConstantInt>(CI->getArgOperand(2));
if (!LenC) return 0;
uint64_t Len = LenC->getZExtValue();
if (Len == 0) // memcmp(s1,s2,0) -> 0
return Constant::getNullValue(CI->getType());
- if (Len == 1) { // memcmp(S1,S2,1) -> *LHS - *RHS
- Value *LHSV = B.CreateLoad(CastToCStr(LHS, B), "lhsv");
- Value *RHSV = B.CreateLoad(CastToCStr(RHS, B), "rhsv");
- return B.CreateSExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
+ // memcmp(S1,S2,1) -> *(unsigned char*)LHS - *(unsigned char*)RHS
+ if (Len == 1) {
+ Value *LHSV = B.CreateZExt(B.CreateLoad(CastToCStr(LHS, B), "lhsc"),
+ CI->getType(), "lhsv");
+ Value *RHSV = B.CreateZExt(B.CreateLoad(CastToCStr(RHS, B), "rhsc"),
+ CI->getType(), "rhsv");
+ return B.CreateSub(LHSV, RHSV, "chardiff");
}
// Constant folding: memcmp(x, y, l) -> cnst (all arguments are constant)
- std::string LHSStr, RHSStr;
- if (GetConstantStringInfo(LHS, LHSStr) &&
- GetConstantStringInfo(RHS, RHSStr)) {
+ StringRef LHSStr, RHSStr;
+ if (getConstantStringInfo(LHS, LHSStr) &&
+ getConstantStringInfo(RHS, RHSStr)) {
// Make sure we're not reading out-of-bounds memory.
- if (Len > LHSStr.length() || Len > RHSStr.length())
+ if (Len > LHSStr.size() || Len > RHSStr.size())
return 0;
uint64_t Ret = memcmp(LHSStr.data(), RHSStr.data(), Len);
return ConstantInt::get(CI->getType(), Ret);
struct MemCpyOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
FT->getParamType(2) != TD->getIntPtrType(*Context))
return 0;
// memcpy(x, y, n) -> llvm.memcpy(x, y, n, 1)
- EmitMemCpy(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3), 1, B);
- return CI->getOperand(1);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
+ CI->getArgOperand(2), 1);
+ return CI->getArgOperand(0);
}
};
struct MemMoveOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
FT->getParamType(2) != TD->getIntPtrType(*Context))
return 0;
// memmove(x, y, n) -> llvm.memmove(x, y, n, 1)
- EmitMemMove(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3), 1, B);
- return CI->getOperand(1);
+ B.CreateMemMove(CI->getArgOperand(0), CI->getArgOperand(1),
+ CI->getArgOperand(2), 1);
+ return CI->getArgOperand(0);
}
};
struct MemSetOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<IntegerType>(FT->getParamType(1)) ||
- FT->getParamType(2) != TD->getIntPtrType(*Context))
- return 0;
-
- // memset(p, v, n) -> llvm.memset(p, v, n, 1)
- Value *Val = B.CreateIntCast(CI->getOperand(2), Type::getInt8Ty(*Context),
- false);
- EmitMemSet(CI->getOperand(1), Val, CI->getOperand(3), B);
- return CI->getOperand(1);
- }
-};
-
-//===----------------------------------------------------------------------===//
-// Object Size Checking Optimizations
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------===//
-// 'memcpy_chk' Optimizations
-
-struct MemCpyChkOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
- if (!TD) return 0;
-
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getParamType(3)) ||
- FT->getParamType(2) != TD->getIntPtrType(*Context))
- return 0;
-
- ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(4));
- if (!SizeCI)
- return 0;
- if (SizeCI->isAllOnesValue()) {
- EmitMemCpy(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3), 1, B);
- return CI->getOperand(1);
- }
-
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// 'memset_chk' Optimizations
-
-struct MemSetChkOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
- if (!TD) return 0;
-
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<IntegerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getParamType(3)) ||
- FT->getParamType(2) != TD->getIntPtrType(*Context))
- return 0;
-
- ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(4));
- if (!SizeCI)
+ !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isIntegerTy() ||
+ FT->getParamType(2) != TD->getIntPtrType(*Context))
return 0;
- if (SizeCI->isAllOnesValue()) {
- Value *Val = B.CreateIntCast(CI->getOperand(2), Type::getInt8Ty(*Context),
- false);
- EmitMemSet(CI->getOperand(1), Val, CI->getOperand(3), B);
- return CI->getOperand(1);
- }
- return 0;
+ // memset(p, v, n) -> llvm.memset(p, v, n, 1)
+ Value *Val = B.CreateIntCast(CI->getArgOperand(1), B.getInt8Ty(), false);
+ B.CreateMemSet(CI->getArgOperand(0), Val, CI->getArgOperand(2), 1);
+ return CI->getArgOperand(0);
}
};
+//===----------------------------------------------------------------------===//
+// Math Library Optimizations
+//===----------------------------------------------------------------------===//
+
//===---------------------------------------===//
-// 'memmove_chk' Optimizations
+// Double -> Float Shrinking Optimizations for Unary Functions like 'floor'
-struct MemMoveChkOpt : public LibCallOptimization {
+struct UnaryDoubleFPOpt : public LibCallOptimization {
+ bool CheckRetType;
+ UnaryDoubleFPOpt(bool CheckReturnType): CheckRetType(CheckReturnType) {}
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
- if (!TD) return 0;
-
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getParamType(3)) ||
- FT->getParamType(2) != TD->getIntPtrType(*Context))
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 1 || !FT->getReturnType()->isDoubleTy() ||
+ !FT->getParamType(0)->isDoubleTy())
return 0;
- ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(4));
- if (!SizeCI)
- return 0;
- if (SizeCI->isAllOnesValue()) {
- EmitMemMove(CI->getOperand(1), CI->getOperand(2), CI->getOperand(3),
- 1, B);
- return CI->getOperand(1);
+ if (CheckRetType) {
+ // Check if all the uses for function like 'sin' are converted to float.
+ for (Value::use_iterator UseI = CI->use_begin(); UseI != CI->use_end();
+ ++UseI) {
+ FPTruncInst *Cast = dyn_cast<FPTruncInst>(*UseI);
+ if (Cast == 0 || !Cast->getType()->isFloatTy())
+ return 0;
+ }
}
- return 0;
+ // If this is something like 'floor((double)floatval)', convert to floorf.
+ FPExtInst *Cast = dyn_cast<FPExtInst>(CI->getArgOperand(0));
+ if (Cast == 0 || !Cast->getOperand(0)->getType()->isFloatTy())
+ return 0;
+
+ // floor((double)floatval) -> (double)floorf(floatval)
+ Value *V = Cast->getOperand(0);
+ V = EmitUnaryFloatFnCall(V, Callee->getName(), B, Callee->getAttributes());
+ return B.CreateFPExt(V, B.getDoubleTy());
}
};
-struct StrCpyChkOpt : public LibCallOptimization {
+//===---------------------------------------===//
+// 'cos*' Optimizations
+struct CosOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 3 || FT->getReturnType() != FT->getParamType(0) ||
- !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)))
- return 0;
-
- ConstantInt *SizeCI = dyn_cast<ConstantInt>(CI->getOperand(3));
- if (!SizeCI)
- return 0;
-
- // We don't have any length information, just lower to a plain strcpy.
- if (SizeCI->isAllOnesValue())
- return EmitStrCpy(CI->getOperand(1), CI->getOperand(2), B);
+ Value *Ret = NULL;
+ if (UnsafeFPShrink && Callee->getName() == "cos" &&
+ TLI->has(LibFunc::cosf)) {
+ UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
+ Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
+ }
- return 0;
+ FunctionType *FT = Callee->getFunctionType();
+ // Just make sure this has 1 argument of FP type, which matches the
+ // result type.
+ if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
+ !FT->getParamType(0)->isFloatingPointTy())
+ return Ret;
+
+ // cos(-x) -> cos(x)
+ Value *Op1 = CI->getArgOperand(0);
+ if (BinaryOperator::isFNeg(Op1)) {
+ BinaryOperator *BinExpr = cast<BinaryOperator>(Op1);
+ return B.CreateCall(Callee, BinExpr->getOperand(1), "cos");
+ }
+ return Ret;
}
};
-
-//===----------------------------------------------------------------------===//
-// Math Library Optimizations
-//===----------------------------------------------------------------------===//
-
//===---------------------------------------===//
// 'pow*' Optimizations
struct PowOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ Value *Ret = NULL;
+ if (UnsafeFPShrink && Callee->getName() == "pow" &&
+ TLI->has(LibFunc::powf)) {
+ UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
+ Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
+ }
+
+ FunctionType *FT = Callee->getFunctionType();
// Just make sure this has 2 arguments of the same FP type, which match the
// result type.
if (FT->getNumParams() != 2 || FT->getReturnType() != FT->getParamType(0) ||
FT->getParamType(0) != FT->getParamType(1) ||
- !FT->getParamType(0)->isFloatingPoint())
- return 0;
+ !FT->getParamType(0)->isFloatingPointTy())
+ return Ret;
- Value *Op1 = CI->getOperand(1), *Op2 = CI->getOperand(2);
+ Value *Op1 = CI->getArgOperand(0), *Op2 = CI->getArgOperand(1);
if (ConstantFP *Op1C = dyn_cast<ConstantFP>(Op1)) {
if (Op1C->isExactlyValue(1.0)) // pow(1.0, x) -> 1.0
return Op1C;
}
ConstantFP *Op2C = dyn_cast<ConstantFP>(Op2);
- if (Op2C == 0) return 0;
+ if (Op2C == 0) return Ret;
if (Op2C->getValueAPF().isZero()) // pow(x, 0.0) -> 1.0
return ConstantFP::get(CI->getType(), 1.0);
if (Op2C->isExactlyValue(0.5)) {
// Expand pow(x, 0.5) to (x == -infinity ? +infinity : fabs(sqrt(x))).
// This is faster than calling pow, and still handles negative zero
- // and negative infinite correctly.
+ // and negative infinity correctly.
// TODO: In fast-math mode, this could be just sqrt(x).
// TODO: In finite-only mode, this could be just fabs(sqrt(x)).
Value *Inf = ConstantFP::getInfinity(CI->getType());
Callee->getAttributes());
Value *FAbs = EmitUnaryFloatFnCall(Sqrt, "fabs", B,
Callee->getAttributes());
- Value *FCmp = B.CreateFCmpOEQ(Op1, NegInf, "tmp");
- Value *Sel = B.CreateSelect(FCmp, Inf, FAbs, "tmp");
+ Value *FCmp = B.CreateFCmpOEQ(Op1, NegInf);
+ Value *Sel = B.CreateSelect(FCmp, Inf, FAbs);
return Sel;
}
struct Exp2Opt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ Value *Ret = NULL;
+ if (UnsafeFPShrink && Callee->getName() == "exp2" &&
+ TLI->has(LibFunc::exp2)) {
+ UnaryDoubleFPOpt UnsafeUnaryDoubleFP(true);
+ Ret = UnsafeUnaryDoubleFP.CallOptimizer(Callee, CI, B);
+ }
+
+ FunctionType *FT = Callee->getFunctionType();
// Just make sure this has 1 argument of FP type, which matches the
// result type.
if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
- !FT->getParamType(0)->isFloatingPoint())
- return 0;
+ !FT->getParamType(0)->isFloatingPointTy())
+ return Ret;
- Value *Op = CI->getOperand(1);
+ Value *Op = CI->getArgOperand(0);
// Turn exp2(sitofp(x)) -> ldexp(1.0, sext(x)) if sizeof(x) <= 32
// Turn exp2(uitofp(x)) -> ldexp(1.0, zext(x)) if sizeof(x) < 32
Value *LdExpArg = 0;
if (SIToFPInst *OpC = dyn_cast<SIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() <= 32)
- LdExpArg = B.CreateSExt(OpC->getOperand(0),
- Type::getInt32Ty(*Context), "tmp");
+ LdExpArg = B.CreateSExt(OpC->getOperand(0), B.getInt32Ty());
} else if (UIToFPInst *OpC = dyn_cast<UIToFPInst>(Op)) {
if (OpC->getOperand(0)->getType()->getPrimitiveSizeInBits() < 32)
- LdExpArg = B.CreateZExt(OpC->getOperand(0),
- Type::getInt32Ty(*Context), "tmp");
+ LdExpArg = B.CreateZExt(OpC->getOperand(0), B.getInt32Ty());
}
if (LdExpArg) {
Module *M = Caller->getParent();
Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(),
- Type::getInt32Ty(*Context),NULL);
+ B.getInt32Ty(), NULL);
CallInst *CI = B.CreateCall2(Callee, One, LdExpArg);
if (const Function *F = dyn_cast<Function>(Callee->stripPointerCasts()))
CI->setCallingConv(F->getCallingConv());
return CI;
}
- return 0;
- }
-};
-
-//===---------------------------------------===//
-// Double -> Float Shrinking Optimizations for Unary Functions like 'floor'
-
-struct UnaryDoubleFPOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 1 || !FT->getReturnType()->isDoubleTy() ||
- !FT->getParamType(0)->isDoubleTy())
- return 0;
-
- // If this is something like 'floor((double)floatval)', convert to floorf.
- FPExtInst *Cast = dyn_cast<FPExtInst>(CI->getOperand(1));
- if (Cast == 0 || !Cast->getOperand(0)->getType()->isFloatTy())
- return 0;
-
- // floor((double)floatval) -> (double)floorf(floatval)
- Value *V = Cast->getOperand(0);
- V = EmitUnaryFloatFnCall(V, Callee->getName().data(), B,
- Callee->getAttributes());
- return B.CreateFPExt(V, Type::getDoubleTy(*Context));
+ return Ret;
}
};
struct FFSOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
// Just make sure this has 2 arguments of the same FP type, which match the
// result type.
if (FT->getNumParams() != 1 ||
- !FT->getReturnType()->isInteger(32) ||
- !isa<IntegerType>(FT->getParamType(0)))
+ !FT->getReturnType()->isIntegerTy(32) ||
+ !FT->getParamType(0)->isIntegerTy())
return 0;
- Value *Op = CI->getOperand(1);
+ Value *Op = CI->getArgOperand(0);
// Constant fold.
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
if (CI->getValue() == 0) // ffs(0) -> 0.
return Constant::getNullValue(CI->getType());
- return ConstantInt::get(Type::getInt32Ty(*Context), // ffs(c) -> cttz(c)+1
- CI->getValue().countTrailingZeros()+1);
+ // ffs(c) -> cttz(c)+1
+ return B.getInt32(CI->getValue().countTrailingZeros() + 1);
}
// ffs(x) -> x != 0 ? (i32)llvm.cttz(x)+1 : 0
- const Type *ArgType = Op->getType();
+ Type *ArgType = Op->getType();
Value *F = Intrinsic::getDeclaration(Callee->getParent(),
- Intrinsic::cttz, &ArgType, 1);
- Value *V = B.CreateCall(F, Op, "cttz");
- V = B.CreateAdd(V, ConstantInt::get(V->getType(), 1), "tmp");
- V = B.CreateIntCast(V, Type::getInt32Ty(*Context), false, "tmp");
-
- Value *Cond = B.CreateICmpNE(Op, Constant::getNullValue(ArgType), "tmp");
- return B.CreateSelect(Cond, V,
- ConstantInt::get(Type::getInt32Ty(*Context), 0));
+ Intrinsic::cttz, ArgType);
+ Value *V = B.CreateCall2(F, Op, B.getFalse(), "cttz");
+ V = B.CreateAdd(V, ConstantInt::get(V->getType(), 1));
+ V = B.CreateIntCast(V, B.getInt32Ty(), false);
+
+ Value *Cond = B.CreateICmpNE(Op, Constant::getNullValue(ArgType));
+ return B.CreateSelect(Cond, V, B.getInt32(0));
}
};
struct IsDigitOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
- if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
- !FT->getParamType(0)->isInteger(32))
+ if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
+ !FT->getParamType(0)->isIntegerTy(32))
return 0;
// isdigit(c) -> (c-'0') <u 10
- Value *Op = CI->getOperand(1);
- Op = B.CreateSub(Op, ConstantInt::get(Type::getInt32Ty(*Context), '0'),
- "isdigittmp");
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 10),
- "isdigit");
+ Value *Op = CI->getArgOperand(0);
+ Op = B.CreateSub(Op, B.getInt32('0'), "isdigittmp");
+ Op = B.CreateICmpULT(Op, B.getInt32(10), "isdigit");
return B.CreateZExt(Op, CI->getType());
}
};
struct IsAsciiOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
- if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
- !FT->getParamType(0)->isInteger(32))
+ if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
+ !FT->getParamType(0)->isIntegerTy(32))
return 0;
// isascii(c) -> c <u 128
- Value *Op = CI->getOperand(1);
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 128),
- "isascii");
+ Value *Op = CI->getArgOperand(0);
+ Op = B.CreateICmpULT(Op, B.getInt32(128), "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
struct AbsOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
// We require integer(integer) where the types agree.
- if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
+ if (FT->getNumParams() != 1 || !FT->getReturnType()->isIntegerTy() ||
FT->getParamType(0) != FT->getReturnType())
return 0;
// abs(x) -> x >s -1 ? x : -x
- Value *Op = CI->getOperand(1);
- Value *Pos = B.CreateICmpSGT(Op,
- Constant::getAllOnesValue(Op->getType()),
+ Value *Op = CI->getArgOperand(0);
+ Value *Pos = B.CreateICmpSGT(Op, Constant::getAllOnesValue(Op->getType()),
"ispos");
Value *Neg = B.CreateNeg(Op, "neg");
return B.CreateSelect(Pos, Op, Neg);
struct ToAsciiOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- const FunctionType *FT = Callee->getFunctionType();
+ FunctionType *FT = Callee->getFunctionType();
// We require i32(i32)
if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
- !FT->getParamType(0)->isInteger(32))
+ !FT->getParamType(0)->isIntegerTy(32))
return 0;
// isascii(c) -> c & 0x7f
- return B.CreateAnd(CI->getOperand(1),
+ return B.CreateAnd(CI->getArgOperand(0),
ConstantInt::get(CI->getType(),0x7F));
}
};
// 'printf' Optimizations
struct PrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require one fixed pointer argument and an integer/void result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() < 1 || !isa<PointerType>(FT->getParamType(0)) ||
- !(isa<IntegerType>(FT->getReturnType()) ||
- FT->getReturnType()->isVoidTy()))
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// Check for a fixed format string.
- std::string FormatStr;
- if (!GetConstantStringInfo(CI->getOperand(1), FormatStr))
+ StringRef FormatStr;
+ if (!getConstantStringInfo(CI->getArgOperand(0), FormatStr))
return 0;
// Empty format string -> noop.
return CI->use_empty() ? (Value*)CI :
ConstantInt::get(CI->getType(), 0);
- // printf("x") -> putchar('x'), even for '%'. Return the result of putchar
- // in case there is an error writing to stdout.
+ // Do not do any of the following transformations if the printf return value
+ // is used, in general the printf return value is not compatible with either
+ // putchar() or puts().
+ if (!CI->use_empty())
+ return 0;
+
+ // printf("x") -> putchar('x'), even for '%'.
if (FormatStr.size() == 1) {
- Value *Res = EmitPutChar(ConstantInt::get(Type::getInt32Ty(*Context),
- FormatStr[0]), B);
- if (CI->use_empty()) return CI;
+ Value *Res = EmitPutChar(B.getInt32(FormatStr[0]), B, TD, TLI);
+ if (CI->use_empty() || !Res) return Res;
return B.CreateIntCast(Res, CI->getType(), true);
}
FormatStr.find('%') == std::string::npos) { // no format characters.
// Create a string literal with no \n on it. We expect the constant merge
// pass to be run after this pass, to merge duplicate strings.
- FormatStr.erase(FormatStr.end()-1);
- Constant *C = ConstantArray::get(*Context, FormatStr, true);
- C = new GlobalVariable(*Callee->getParent(), C->getType(), true,
- GlobalVariable::InternalLinkage, C, "str");
- EmitPutS(C, B);
- return CI->use_empty() ? (Value*)CI :
- ConstantInt::get(CI->getType(), FormatStr.size()+1);
+ FormatStr = FormatStr.drop_back();
+ Value *GV = B.CreateGlobalString(FormatStr, "str");
+ Value *NewCI = EmitPutS(GV, B, TD, TLI);
+ return (CI->use_empty() || !NewCI) ?
+ NewCI :
+ ConstantInt::get(CI->getType(), FormatStr.size()+1);
}
// Optimize specific format strings.
- // printf("%c", chr) --> putchar(*(i8*)dst)
- if (FormatStr == "%c" && CI->getNumOperands() > 2 &&
- isa<IntegerType>(CI->getOperand(2)->getType())) {
- Value *Res = EmitPutChar(CI->getOperand(2), B);
+ // printf("%c", chr) --> putchar(chr)
+ if (FormatStr == "%c" && CI->getNumArgOperands() > 1 &&
+ CI->getArgOperand(1)->getType()->isIntegerTy()) {
+ Value *Res = EmitPutChar(CI->getArgOperand(1), B, TD, TLI);
- if (CI->use_empty()) return CI;
+ if (CI->use_empty() || !Res) return Res;
return B.CreateIntCast(Res, CI->getType(), true);
}
// printf("%s\n", str) --> puts(str)
- if (FormatStr == "%s\n" && CI->getNumOperands() > 2 &&
- isa<PointerType>(CI->getOperand(2)->getType()) &&
- CI->use_empty()) {
- EmitPutS(CI->getOperand(2), B);
- return CI;
+ if (FormatStr == "%s\n" && CI->getNumArgOperands() > 1 &&
+ CI->getArgOperand(1)->getType()->isPointerTy()) {
+ return EmitPutS(CI->getArgOperand(1), B, TD, TLI);
+ }
+ return 0;
+ }
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require one fixed pointer argument and an integer/void result.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
+ !(FT->getReturnType()->isIntegerTy() ||
+ FT->getReturnType()->isVoidTy()))
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // printf(format, ...) -> iprintf(format, ...) if no floating point
+ // arguments.
+ if (TLI->has(LibFunc::iprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *IPrintFFn =
+ M->getOrInsertFunction("iprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(IPrintFFn);
+ B.Insert(New);
+ return New;
}
return 0;
}
// 'sprintf' Optimizations
struct SPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed pointer arguments and an integer result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getReturnType()))
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// Check for a fixed format string.
- std::string FormatStr;
- if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
+ StringRef FormatStr;
+ if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
return 0;
// If we just have a format string (nothing else crazy) transform it.
- if (CI->getNumOperands() == 3) {
+ if (CI->getNumArgOperands() == 2) {
// Make sure there's no % in the constant array. We could try to handle
// %% -> % in the future if we cared.
for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
if (FormatStr[i] == '%')
return 0; // we found a format specifier, bail out.
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
// sprintf(str, fmt) -> llvm.memcpy(str, fmt, strlen(fmt)+1, 1)
- EmitMemCpy(CI->getOperand(1), CI->getOperand(2), // Copy the nul byte.
- ConstantInt::get
- (TD->getIntPtrType(*Context), FormatStr.size()+1),1,B);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(1),
+ ConstantInt::get(TD->getIntPtrType(*Context), // Copy the
+ FormatStr.size() + 1), 1); // nul byte.
return ConstantInt::get(CI->getType(), FormatStr.size());
}
// The remaining optimizations require the format string to be "%s" or "%c"
// and have an extra operand.
- if (FormatStr.size() != 2 || FormatStr[0] != '%' || CI->getNumOperands() <4)
+ if (FormatStr.size() != 2 || FormatStr[0] != '%' ||
+ CI->getNumArgOperands() < 3)
return 0;
// Decode the second character of the format string.
if (FormatStr[1] == 'c') {
// sprintf(dst, "%c", chr) --> *(i8*)dst = chr; *((i8*)dst+1) = 0
- if (!isa<IntegerType>(CI->getOperand(3)->getType())) return 0;
- Value *V = B.CreateTrunc(CI->getOperand(3),
- Type::getInt8Ty(*Context), "char");
- Value *Ptr = CastToCStr(CI->getOperand(1), B);
+ if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
+ Value *V = B.CreateTrunc(CI->getArgOperand(2), B.getInt8Ty(), "char");
+ Value *Ptr = CastToCStr(CI->getArgOperand(0), B);
B.CreateStore(V, Ptr);
- Ptr = B.CreateGEP(Ptr, ConstantInt::get(Type::getInt32Ty(*Context), 1),
- "nul");
- B.CreateStore(Constant::getNullValue(Type::getInt8Ty(*Context)), Ptr);
+ Ptr = B.CreateGEP(Ptr, B.getInt32(1), "nul");
+ B.CreateStore(B.getInt8(0), Ptr);
return ConstantInt::get(CI->getType(), 1);
}
if (FormatStr[1] == 's') {
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
// sprintf(dest, "%s", str) -> llvm.memcpy(dest, str, strlen(str)+1, 1)
- if (!isa<PointerType>(CI->getOperand(3)->getType())) return 0;
+ if (!CI->getArgOperand(2)->getType()->isPointerTy()) return 0;
- Value *Len = EmitStrLen(CI->getOperand(3), B);
+ Value *Len = EmitStrLen(CI->getArgOperand(2), B, TD, TLI);
+ if (!Len)
+ return 0;
Value *IncLen = B.CreateAdd(Len,
ConstantInt::get(Len->getType(), 1),
"leninc");
- EmitMemCpy(CI->getOperand(1), CI->getOperand(3), IncLen, 1, B);
+ B.CreateMemCpy(CI->getArgOperand(0), CI->getArgOperand(2), IncLen, 1);
// The sprintf result is the unincremented number of bytes in the string.
return B.CreateIntCast(Len, CI->getType(), false);
}
return 0;
}
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require two fixed pointer arguments and an integer result.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // sprintf(str, format, ...) -> siprintf(str, format, ...) if no floating
+ // point arguments.
+ if (TLI->has(LibFunc::siprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *SIPrintFFn =
+ M->getOrInsertFunction("siprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(SIPrintFFn);
+ B.Insert(New);
+ return New;
+ }
+ return 0;
+ }
};
//===---------------------------------------===//
struct FWriteOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
// Require a pointer, an integer, an integer, a pointer, returning integer.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 4 || !isa<PointerType>(FT->getParamType(0)) ||
- !isa<IntegerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getParamType(2)) ||
- !isa<PointerType>(FT->getParamType(3)) ||
- !isa<IntegerType>(FT->getReturnType()))
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 4 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isIntegerTy() ||
+ !FT->getParamType(2)->isIntegerTy() ||
+ !FT->getParamType(3)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy())
return 0;
// Get the element size and count.
- ConstantInt *SizeC = dyn_cast<ConstantInt>(CI->getOperand(2));
- ConstantInt *CountC = dyn_cast<ConstantInt>(CI->getOperand(3));
+ ConstantInt *SizeC = dyn_cast<ConstantInt>(CI->getArgOperand(1));
+ ConstantInt *CountC = dyn_cast<ConstantInt>(CI->getArgOperand(2));
if (!SizeC || !CountC) return 0;
uint64_t Bytes = SizeC->getZExtValue()*CountC->getZExtValue();
return ConstantInt::get(CI->getType(), 0);
// If this is writing one byte, turn it into fputc.
- if (Bytes == 1) { // fwrite(S,1,1,F) -> fputc(S[0],F)
- Value *Char = B.CreateLoad(CastToCStr(CI->getOperand(1), B), "char");
- EmitFPutC(Char, CI->getOperand(4), B);
- return ConstantInt::get(CI->getType(), 1);
+ // This optimisation is only valid, if the return value is unused.
+ if (Bytes == 1 && CI->use_empty()) { // fwrite(S,1,1,F) -> fputc(S[0],F)
+ Value *Char = B.CreateLoad(CastToCStr(CI->getArgOperand(0), B), "char");
+ Value *NewCI = EmitFPutC(Char, CI->getArgOperand(3), B, TD, TLI);
+ return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
}
return 0;
struct FPutsOpt : public LibCallOptimization {
virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
// Require two pointers. Also, we can't optimize if return value is used.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
!CI->use_empty())
return 0;
// fputs(s,F) --> fwrite(s,1,strlen(s),F)
- uint64_t Len = GetStringLength(CI->getOperand(1));
+ uint64_t Len = GetStringLength(CI->getArgOperand(0));
if (!Len) return 0;
- EmitFWrite(CI->getOperand(1),
- ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
- CI->getOperand(2), B);
- return CI; // Known to have no uses (see above).
+ // Known to have no uses (see above).
+ return EmitFWrite(CI->getArgOperand(0),
+ ConstantInt::get(TD->getIntPtrType(*Context), Len-1),
+ CI->getArgOperand(1), B, TD, TLI);
}
};
// 'fprintf' Optimizations
struct FPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
- // Require two fixed paramters as pointers and integer result.
- const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 2 || !isa<PointerType>(FT->getParamType(0)) ||
- !isa<PointerType>(FT->getParamType(1)) ||
- !isa<IntegerType>(FT->getReturnType()))
- return 0;
-
+ Value *OptimizeFixedFormatString(Function *Callee, CallInst *CI,
+ IRBuilder<> &B) {
// All the optimizations depend on the format string.
- std::string FormatStr;
- if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
+ StringRef FormatStr;
+ if (!getConstantStringInfo(CI->getArgOperand(1), FormatStr))
return 0;
// fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
- if (CI->getNumOperands() == 3) {
+ if (CI->getNumArgOperands() == 2) {
for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
if (FormatStr[i] == '%') // Could handle %% -> % if we cared.
return 0; // We found a format specifier.
- // These optimizations require TargetData.
+ // These optimizations require DataLayout.
if (!TD) return 0;
- EmitFWrite(CI->getOperand(2),
- ConstantInt::get(TD->getIntPtrType(*Context),
- FormatStr.size()),
- CI->getOperand(1), B);
- return ConstantInt::get(CI->getType(), FormatStr.size());
+ Value *NewCI = EmitFWrite(CI->getArgOperand(1),
+ ConstantInt::get(TD->getIntPtrType(*Context),
+ FormatStr.size()),
+ CI->getArgOperand(0), B, TD, TLI);
+ return NewCI ? ConstantInt::get(CI->getType(), FormatStr.size()) : 0;
}
// The remaining optimizations require the format string to be "%s" or "%c"
// and have an extra operand.
- if (FormatStr.size() != 2 || FormatStr[0] != '%' || CI->getNumOperands() <4)
+ if (FormatStr.size() != 2 || FormatStr[0] != '%' ||
+ CI->getNumArgOperands() < 3)
return 0;
// Decode the second character of the format string.
if (FormatStr[1] == 'c') {
- // fprintf(F, "%c", chr) --> *(i8*)dst = chr
- if (!isa<IntegerType>(CI->getOperand(3)->getType())) return 0;
- EmitFPutC(CI->getOperand(3), CI->getOperand(1), B);
- return ConstantInt::get(CI->getType(), 1);
+ // fprintf(F, "%c", chr) --> fputc(chr, F)
+ if (!CI->getArgOperand(2)->getType()->isIntegerTy()) return 0;
+ Value *NewCI = EmitFPutC(CI->getArgOperand(2), CI->getArgOperand(0), B,
+ TD, TLI);
+ return NewCI ? ConstantInt::get(CI->getType(), 1) : 0;
}
if (FormatStr[1] == 's') {
- // fprintf(F, "%s", str) -> fputs(str, F)
- if (!isa<PointerType>(CI->getOperand(3)->getType()) || !CI->use_empty())
+ // fprintf(F, "%s", str) --> fputs(str, F)
+ if (!CI->getArgOperand(2)->getType()->isPointerTy() || !CI->use_empty())
return 0;
- EmitFPutS(CI->getOperand(3), CI->getOperand(1), B);
- return CI;
+ return EmitFPutS(CI->getArgOperand(2), CI->getArgOperand(0), B, TD, TLI);
+ }
+ return 0;
+ }
+
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require two fixed paramters as pointers and integer result.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() != 2 || !FT->getParamType(0)->isPointerTy() ||
+ !FT->getParamType(1)->isPointerTy() ||
+ !FT->getReturnType()->isIntegerTy())
+ return 0;
+
+ if (Value *V = OptimizeFixedFormatString(Callee, CI, B)) {
+ return V;
+ }
+
+ // fprintf(stream, format, ...) -> fiprintf(stream, format, ...) if no
+ // floating point arguments.
+ if (TLI->has(LibFunc::fiprintf) && !CallHasFloatingPointArgument(CI)) {
+ Module *M = B.GetInsertBlock()->getParent()->getParent();
+ Constant *FIPrintFFn =
+ M->getOrInsertFunction("fiprintf", FT, Callee->getAttributes());
+ CallInst *New = cast<CallInst>(CI->clone());
+ New->setCalledFunction(FIPrintFFn);
+ B.Insert(New);
+ return New;
+ }
+ return 0;
+ }
+};
+
+//===---------------------------------------===//
+// 'puts' Optimizations
+
+struct PutsOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // Require one fixed pointer argument and an integer/void result.
+ FunctionType *FT = Callee->getFunctionType();
+ if (FT->getNumParams() < 1 || !FT->getParamType(0)->isPointerTy() ||
+ !(FT->getReturnType()->isIntegerTy() ||
+ FT->getReturnType()->isVoidTy()))
+ return 0;
+
+ // Check for a constant string.
+ StringRef Str;
+ if (!getConstantStringInfo(CI->getArgOperand(0), Str))
+ return 0;
+
+ if (Str.empty() && CI->use_empty()) {
+ // puts("") -> putchar('\n')
+ Value *Res = EmitPutChar(B.getInt32('\n'), B, TD, TLI);
+ if (CI->use_empty() || !Res) return Res;
+ return B.CreateIntCast(Res, CI->getType(), true);
}
+
return 0;
}
};
/// This pass optimizes well known library functions from libc and libm.
///
class SimplifyLibCalls : public FunctionPass {
+ TargetLibraryInfo *TLI;
+
StringMap<LibCallOptimization*> Optimizations;
// String and Memory LibCall Optimizations
- StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrCmpOpt StrCmp;
- StrNCmpOpt StrNCmp; StrCpyOpt StrCpy; StrNCpyOpt StrNCpy; StrLenOpt StrLen;
- StrToOpt StrTo; StrStrOpt StrStr;
+ StrCpyOpt StrCpy; StrCpyOpt StrCpyChk;
+ StpCpyOpt StpCpy; StpCpyOpt StpCpyChk;
+ StrNCpyOpt StrNCpy;
+ StrLenOpt StrLen; StrPBrkOpt StrPBrk;
+ StrToOpt StrTo; StrSpnOpt StrSpn; StrCSpnOpt StrCSpn; StrStrOpt StrStr;
MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove; MemSetOpt MemSet;
// Math Library Optimizations
- PowOpt Pow; Exp2Opt Exp2; UnaryDoubleFPOpt UnaryDoubleFP;
+ CosOpt Cos; PowOpt Pow; Exp2Opt Exp2;
+ UnaryDoubleFPOpt UnaryDoubleFP, UnsafeUnaryDoubleFP;
// Integer Optimizations
FFSOpt FFS; AbsOpt Abs; IsDigitOpt IsDigit; IsAsciiOpt IsAscii;
ToAsciiOpt ToAscii;
// Formatting and IO Optimizations
SPrintFOpt SPrintF; PrintFOpt PrintF;
FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
-
- // Object Size Checking
- MemCpyChkOpt MemCpyChk; MemSetChkOpt MemSetChk; MemMoveChkOpt MemMoveChk;
- StrCpyChkOpt StrCpyChk;
+ PutsOpt Puts;
bool Modified; // This is only used by doInitialization.
public:
static char ID; // Pass identification
- SimplifyLibCalls() : FunctionPass(&ID) {}
+ SimplifyLibCalls() : FunctionPass(ID), StrCpy(false), StrCpyChk(true),
+ StpCpy(false), StpCpyChk(true),
+ UnaryDoubleFP(false), UnsafeUnaryDoubleFP(true) {
+ initializeSimplifyLibCallsPass(*PassRegistry::getPassRegistry());
+ }
+ void AddOpt(LibFunc::Func F, LibCallOptimization* Opt);
+ void AddOpt(LibFunc::Func F1, LibFunc::Func F2, LibCallOptimization* Opt);
void InitOptimizations();
bool runOnFunction(Function &F);
void setDoesNotAlias(Function &F, unsigned n);
bool doInitialization(Module &M);
+ void inferPrototypeAttributes(Function &F);
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequired<TargetLibraryInfo>();
}
};
- char SimplifyLibCalls::ID = 0;
} // end anonymous namespace.
-static RegisterPass<SimplifyLibCalls>
-X("simplify-libcalls", "Simplify well-known library calls");
+char SimplifyLibCalls::ID = 0;
+
+INITIALIZE_PASS_BEGIN(SimplifyLibCalls, "simplify-libcalls",
+ "Simplify well-known library calls", false, false)
+INITIALIZE_PASS_DEPENDENCY(TargetLibraryInfo)
+INITIALIZE_PASS_END(SimplifyLibCalls, "simplify-libcalls",
+ "Simplify well-known library calls", false, false)
// Public interface to the Simplify LibCalls pass.
FunctionPass *llvm::createSimplifyLibCallsPass() {
return new SimplifyLibCalls();
}
+void SimplifyLibCalls::AddOpt(LibFunc::Func F, LibCallOptimization* Opt) {
+ if (TLI->has(F))
+ Optimizations[TLI->getName(F)] = Opt;
+}
+
+void SimplifyLibCalls::AddOpt(LibFunc::Func F1, LibFunc::Func F2,
+ LibCallOptimization* Opt) {
+ if (TLI->has(F1) && TLI->has(F2))
+ Optimizations[TLI->getName(F1)] = Opt;
+}
+
/// Optimizations - Populate the Optimizations map with all the optimizations
/// we know.
void SimplifyLibCalls::InitOptimizations() {
// String and Memory LibCall Optimizations
- Optimizations["strcat"] = &StrCat;
- Optimizations["strncat"] = &StrNCat;
- Optimizations["strchr"] = &StrChr;
- Optimizations["strcmp"] = &StrCmp;
- Optimizations["strncmp"] = &StrNCmp;
Optimizations["strcpy"] = &StrCpy;
Optimizations["strncpy"] = &StrNCpy;
+ Optimizations["stpcpy"] = &StpCpy;
Optimizations["strlen"] = &StrLen;
+ Optimizations["strpbrk"] = &StrPBrk;
Optimizations["strtol"] = &StrTo;
Optimizations["strtod"] = &StrTo;
Optimizations["strtof"] = &StrTo;
Optimizations["strtoll"] = &StrTo;
Optimizations["strtold"] = &StrTo;
Optimizations["strtoull"] = &StrTo;
+ Optimizations["strspn"] = &StrSpn;
+ Optimizations["strcspn"] = &StrCSpn;
Optimizations["strstr"] = &StrStr;
Optimizations["memcmp"] = &MemCmp;
- Optimizations["memcpy"] = &MemCpy;
+ AddOpt(LibFunc::memcpy, &MemCpy);
Optimizations["memmove"] = &MemMove;
- Optimizations["memset"] = &MemSet;
+ AddOpt(LibFunc::memset, &MemSet);
+
+ // _chk variants of String and Memory LibCall Optimizations.
+ Optimizations["__strcpy_chk"] = &StrCpyChk;
+ Optimizations["__stpcpy_chk"] = &StpCpyChk;
// Math Library Optimizations
+ Optimizations["cosf"] = &Cos;
+ Optimizations["cos"] = &Cos;
+ Optimizations["cosl"] = &Cos;
Optimizations["powf"] = &Pow;
Optimizations["pow"] = &Pow;
Optimizations["powl"] = &Pow;
Optimizations["llvm.exp2.f64"] = &Exp2;
Optimizations["llvm.exp2.f32"] = &Exp2;
-#ifdef HAVE_FLOORF
- Optimizations["floor"] = &UnaryDoubleFP;
-#endif
-#ifdef HAVE_CEILF
- Optimizations["ceil"] = &UnaryDoubleFP;
-#endif
-#ifdef HAVE_ROUNDF
- Optimizations["round"] = &UnaryDoubleFP;
-#endif
-#ifdef HAVE_RINTF
- Optimizations["rint"] = &UnaryDoubleFP;
-#endif
-#ifdef HAVE_NEARBYINTF
- Optimizations["nearbyint"] = &UnaryDoubleFP;
-#endif
+ AddOpt(LibFunc::ceil, LibFunc::ceilf, &UnaryDoubleFP);
+ AddOpt(LibFunc::fabs, LibFunc::fabsf, &UnaryDoubleFP);
+ AddOpt(LibFunc::floor, LibFunc::floorf, &UnaryDoubleFP);
+ AddOpt(LibFunc::rint, LibFunc::rintf, &UnaryDoubleFP);
+ AddOpt(LibFunc::round, LibFunc::roundf, &UnaryDoubleFP);
+ AddOpt(LibFunc::nearbyint, LibFunc::nearbyintf, &UnaryDoubleFP);
+ AddOpt(LibFunc::trunc, LibFunc::truncf, &UnaryDoubleFP);
+
+ if(UnsafeFPShrink) {
+ AddOpt(LibFunc::acos, LibFunc::acosf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::acosh, LibFunc::acoshf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::asin, LibFunc::asinf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::asinh, LibFunc::asinhf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::atan, LibFunc::atanf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::atanh, LibFunc::atanhf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::cbrt, LibFunc::cbrtf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::cosh, LibFunc::coshf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::exp, LibFunc::expf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::exp10, LibFunc::exp10f, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::expm1, LibFunc::expm1f, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::log, LibFunc::logf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::log10, LibFunc::log10f, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::log1p, LibFunc::log1pf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::log2, LibFunc::log2f, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::logb, LibFunc::logbf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::sin, LibFunc::sinf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::sinh, LibFunc::sinhf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::sqrt, LibFunc::sqrtf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::tan, LibFunc::tanf, &UnsafeUnaryDoubleFP);
+ AddOpt(LibFunc::tanh, LibFunc::tanhf, &UnsafeUnaryDoubleFP);
+ }
// Integer Optimizations
Optimizations["ffs"] = &FFS;
// Formatting and IO Optimizations
Optimizations["sprintf"] = &SPrintF;
Optimizations["printf"] = &PrintF;
- Optimizations["fwrite"] = &FWrite;
- Optimizations["fputs"] = &FPuts;
+ AddOpt(LibFunc::fwrite, &FWrite);
+ AddOpt(LibFunc::fputs, &FPuts);
Optimizations["fprintf"] = &FPrintF;
-
- // Object Size Checking
- Optimizations["__memcpy_chk"] = &MemCpyChk;
- Optimizations["__memset_chk"] = &MemSetChk;
- Optimizations["__memmove_chk"] = &MemMoveChk;
- Optimizations["__strcpy_chk"] = &StrCpyChk;
+ Optimizations["puts"] = &Puts;
}
/// runOnFunction - Top level algorithm.
///
bool SimplifyLibCalls::runOnFunction(Function &F) {
+ TLI = &getAnalysis<TargetLibraryInfo>();
+
if (Optimizations.empty())
InitOptimizations();
- const TargetData *TD = getAnalysisIfAvailable<TargetData>();
+ const DataLayout *TD = getAnalysisIfAvailable<DataLayout>();
IRBuilder<> Builder(F.getContext());
// Set the builder to the instruction after the call.
Builder.SetInsertPoint(BB, I);
+ // Use debug location of CI for all new instructions.
+ Builder.SetCurrentDebugLocation(CI->getDebugLoc());
+
// Try to optimize this call.
- Value *Result = LCO->OptimizeCall(CI, TD, Builder);
+ Value *Result = LCO->OptimizeCall(CI, TD, TLI, Builder);
if (Result == 0) continue;
DEBUG(dbgs() << "SimplifyLibCalls simplified: " << *CI;
}
}
+
+void SimplifyLibCalls::inferPrototypeAttributes(Function &F) {
+ FunctionType *FTy = F.getFunctionType();
+
+ StringRef Name = F.getName();
+ switch (Name[0]) {
+ case 's':
+ if (Name == "strlen") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "strchr" ||
+ Name == "strrchr") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isIntegerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ } else if (Name == "strcpy" ||
+ Name == "stpcpy" ||
+ Name == "strcat" ||
+ Name == "strtol" ||
+ Name == "strtod" ||
+ Name == "strtof" ||
+ Name == "strtoul" ||
+ Name == "strtoll" ||
+ Name == "strtold" ||
+ Name == "strncat" ||
+ Name == "strncpy" ||
+ Name == "stpncpy" ||
+ Name == "strtoull") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strxfrm") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strcmp" ||
+ Name == "strspn" ||
+ Name == "strncmp" ||
+ Name == "strcspn" ||
+ Name == "strcoll" ||
+ Name == "strcasecmp" ||
+ Name == "strncasecmp") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strstr" ||
+ Name == "strpbrk") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "strtok" ||
+ Name == "strtok_r") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "scanf" ||
+ Name == "setbuf" ||
+ Name == "setvbuf") {
+ if (FTy->getNumParams() < 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "strdup" ||
+ Name == "strndup") {
+ if (FTy->getNumParams() < 1 || !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "stat" ||
+ Name == "sscanf" ||
+ Name == "sprintf" ||
+ Name == "statvfs") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "snprintf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "setitimer") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "system") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "system" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'm':
+ if (Name == "malloc") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "memcmp") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "memchr" ||
+ Name == "memrchr") {
+ if (FTy->getNumParams() != 3)
+ return;
+ setOnlyReadsMemory(F);
+ setDoesNotThrow(F);
+ } else if (Name == "modf" ||
+ Name == "modff" ||
+ Name == "modfl" ||
+ Name == "memcpy" ||
+ Name == "memccpy" ||
+ Name == "memmove") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "memalign") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotAlias(F, 0);
+ } else if (Name == "mkdir" ||
+ Name == "mktime") {
+ if (FTy->getNumParams() == 0 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'r':
+ if (Name == "realloc") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "read") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; "read" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ } else if (Name == "rmdir" ||
+ Name == "rewind" ||
+ Name == "remove" ||
+ Name == "realpath") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "rename" ||
+ Name == "readlink") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'w':
+ if (Name == "write") {
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; "write" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'b':
+ if (Name == "bcopy") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "bcmp") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "bzero") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'c':
+ if (Name == "calloc") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "chmod" ||
+ Name == "chown" ||
+ Name == "ctermid" ||
+ Name == "clearerr" ||
+ Name == "closedir") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'a':
+ if (Name == "atoi" ||
+ Name == "atol" ||
+ Name == "atof" ||
+ Name == "atoll") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "access") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'f':
+ if (Name == "fopen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "fdopen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "feof" ||
+ Name == "free" ||
+ Name == "fseek" ||
+ Name == "ftell" ||
+ Name == "fgetc" ||
+ Name == "fseeko" ||
+ Name == "ftello" ||
+ Name == "fileno" ||
+ Name == "fflush" ||
+ Name == "fclose" ||
+ Name == "fsetpos" ||
+ Name == "flockfile" ||
+ Name == "funlockfile" ||
+ Name == "ftrylockfile") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "ferror") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setOnlyReadsMemory(F);
+ } else if (Name == "fputc" ||
+ Name == "fstat" ||
+ Name == "frexp" ||
+ Name == "frexpf" ||
+ Name == "frexpl" ||
+ Name == "fstatvfs") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "fgets") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 3);
+ } else if (Name == "fread" ||
+ Name == "fwrite") {
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(3)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 4);
+ } else if (Name == "fputs" ||
+ Name == "fscanf" ||
+ Name == "fprintf" ||
+ Name == "fgetpos") {
+ if (FTy->getNumParams() < 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'g':
+ if (Name == "getc" ||
+ Name == "getlogin_r" ||
+ Name == "getc_unlocked") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "getenv") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setOnlyReadsMemory(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "gets" ||
+ Name == "getchar") {
+ setDoesNotThrow(F);
+ } else if (Name == "getitimer") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "getpwnam") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'u':
+ if (Name == "ungetc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "uname" ||
+ Name == "unlink" ||
+ Name == "unsetenv") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "utime" ||
+ Name == "utimes") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 'p':
+ if (Name == "putc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "puts" ||
+ Name == "printf" ||
+ Name == "perror") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "pread" ||
+ Name == "pwrite") {
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ // May throw; these are valid pthread cancellation points.
+ setDoesNotCapture(F, 2);
+ } else if (Name == "putchar") {
+ setDoesNotThrow(F);
+ } else if (Name == "popen") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "pclose") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'v':
+ if (Name == "vscanf") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "vsscanf" ||
+ Name == "vfscanf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "valloc") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "vprintf") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "vfprintf" ||
+ Name == "vsprintf") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "vsnprintf") {
+ if (FTy->getNumParams() != 4 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(2)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 3);
+ }
+ break;
+ case 'o':
+ if (Name == "open") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ } else if (Name == "opendir") {
+ if (FTy->getNumParams() != 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 't':
+ if (Name == "tmpfile") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "times") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'h':
+ if (Name == "htonl" ||
+ Name == "htons") {
+ setDoesNotThrow(F);
+ setDoesNotAccessMemory(F);
+ }
+ break;
+ case 'n':
+ if (Name == "ntohl" ||
+ Name == "ntohs") {
+ setDoesNotThrow(F);
+ setDoesNotAccessMemory(F);
+ }
+ break;
+ case 'l':
+ if (Name == "lstat") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "lchown") {
+ if (FTy->getNumParams() != 3 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ case 'q':
+ if (Name == "qsort") {
+ if (FTy->getNumParams() != 4 || !FTy->getParamType(3)->isPointerTy())
+ return;
+ // May throw; places call through function pointer.
+ setDoesNotCapture(F, 4);
+ }
+ break;
+ case '_':
+ if (Name == "__strdup" ||
+ Name == "__strndup") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "__strtok_r") {
+ if (FTy->getNumParams() != 3 ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "_IO_getc") {
+ if (FTy->getNumParams() != 1 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "_IO_putc") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ }
+ break;
+ case 1:
+ if (Name == "\1__isoc99_scanf") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "\1stat64" ||
+ Name == "\1lstat64" ||
+ Name == "\1statvfs64" ||
+ Name == "\1__isoc99_sscanf") {
+ if (FTy->getNumParams() < 1 ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1fopen64") {
+ if (FTy->getNumParams() != 2 ||
+ !FTy->getReturnType()->isPointerTy() ||
+ !FTy->getParamType(0)->isPointerTy() ||
+ !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ setDoesNotCapture(F, 1);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1fseeko64" ||
+ Name == "\1ftello64") {
+ if (FTy->getNumParams() == 0 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 1);
+ } else if (Name == "\1tmpfile64") {
+ if (!FTy->getReturnType()->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotAlias(F, 0);
+ } else if (Name == "\1fstat64" ||
+ Name == "\1fstatvfs64") {
+ if (FTy->getNumParams() != 2 || !FTy->getParamType(1)->isPointerTy())
+ return;
+ setDoesNotThrow(F);
+ setDoesNotCapture(F, 2);
+ } else if (Name == "\1open64") {
+ if (FTy->getNumParams() < 2 || !FTy->getParamType(0)->isPointerTy())
+ return;
+ // May throw; "open" is a valid pthread cancellation point.
+ setDoesNotCapture(F, 1);
+ }
+ break;
+ }
+}
+
/// doInitialization - Add attributes to well-known functions.
///
bool SimplifyLibCalls::doInitialization(Module &M) {
Modified = false;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I) {
Function &F = *I;
- if (!F.isDeclaration())
- continue;
-
- if (!F.hasName())
- continue;
-
- const FunctionType *FTy = F.getFunctionType();
-
- StringRef Name = F.getName();
- switch (Name[0]) {
- case 's':
- if (Name == "strlen") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "strcpy" ||
- Name == "stpcpy" ||
- Name == "strcat" ||
- Name == "strtol" ||
- Name == "strtod" ||
- Name == "strtof" ||
- Name == "strtoul" ||
- Name == "strtoll" ||
- Name == "strtold" ||
- Name == "strncat" ||
- Name == "strncpy" ||
- Name == "strtoull") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "strxfrm") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "strcmp" ||
- Name == "strspn" ||
- Name == "strncmp" ||
- Name ==" strcspn" ||
- Name == "strcoll" ||
- Name == "strcasecmp" ||
- Name == "strncasecmp") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "strstr" ||
- Name == "strpbrk") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "strtok" ||
- Name == "strtok_r") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "scanf" ||
- Name == "setbuf" ||
- Name == "setvbuf") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "strdup" ||
- Name == "strndup") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "stat" ||
- Name == "sscanf" ||
- Name == "sprintf" ||
- Name == "statvfs") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "snprintf") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(2)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 3);
- } else if (Name == "setitimer") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(1)) ||
- !isa<PointerType>(FTy->getParamType(2)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- setDoesNotCapture(F, 3);
- } else if (Name == "system") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- // May throw; "system" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- }
- break;
- case 'm':
- if (Name == "malloc") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "memcmp") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "memchr" ||
- Name == "memrchr") {
- if (FTy->getNumParams() != 3)
- continue;
- setOnlyReadsMemory(F);
- setDoesNotThrow(F);
- } else if (Name == "modf" ||
- Name == "modff" ||
- Name == "modfl" ||
- Name == "memcpy" ||
- Name == "memccpy" ||
- Name == "memmove") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "memalign") {
- if (!isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotAlias(F, 0);
- } else if (Name == "mkdir" ||
- Name == "mktime") {
- if (FTy->getNumParams() == 0 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'r':
- if (Name == "realloc") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "read") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- // May throw; "read" is a valid pthread cancellation point.
- setDoesNotCapture(F, 2);
- } else if (Name == "rmdir" ||
- Name == "rewind" ||
- Name == "remove" ||
- Name == "realpath") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "rename" ||
- Name == "readlink") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'w':
- if (Name == "write") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- // May throw; "write" is a valid pthread cancellation point.
- setDoesNotCapture(F, 2);
- }
- break;
- case 'b':
- if (Name == "bcopy") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "bcmp") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "bzero") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'c':
- if (Name == "calloc") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "chmod" ||
- Name == "chown" ||
- Name == "ctermid" ||
- Name == "clearerr" ||
- Name == "closedir") {
- if (FTy->getNumParams() == 0 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'a':
- if (Name == "atoi" ||
- Name == "atol" ||
- Name == "atof" ||
- Name == "atoll") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "access") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'f':
- if (Name == "fopen") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "fdopen") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 2);
- } else if (Name == "feof" ||
- Name == "free" ||
- Name == "fseek" ||
- Name == "ftell" ||
- Name == "fgetc" ||
- Name == "fseeko" ||
- Name == "ftello" ||
- Name == "fileno" ||
- Name == "fflush" ||
- Name == "fclose" ||
- Name == "fsetpos" ||
- Name == "flockfile" ||
- Name == "funlockfile" ||
- Name == "ftrylockfile") {
- if (FTy->getNumParams() == 0 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "ferror") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setOnlyReadsMemory(F);
- } else if (Name == "fputc" ||
- Name == "fstat" ||
- Name == "frexp" ||
- Name == "frexpf" ||
- Name == "frexpl" ||
- Name == "fstatvfs") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "fgets") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(2)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 3);
- } else if (Name == "fread" ||
- Name == "fwrite") {
- if (FTy->getNumParams() != 4 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(3)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 4);
- } else if (Name == "fputs" ||
- Name == "fscanf" ||
- Name == "fprintf" ||
- Name == "fgetpos") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'g':
- if (Name == "getc" ||
- Name == "getlogin_r" ||
- Name == "getc_unlocked") {
- if (FTy->getNumParams() == 0 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "getenv") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setOnlyReadsMemory(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "gets" ||
- Name == "getchar") {
- setDoesNotThrow(F);
- } else if (Name == "getitimer") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "getpwnam") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'u':
- if (Name == "ungetc") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "uname" ||
- Name == "unlink" ||
- Name == "unsetenv") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "utime" ||
- Name == "utimes") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- }
- break;
- case 'p':
- if (Name == "putc") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "puts" ||
- Name == "printf" ||
- Name == "perror") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "pread" ||
- Name == "pwrite") {
- if (FTy->getNumParams() != 4 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- // May throw; these are valid pthread cancellation points.
- setDoesNotCapture(F, 2);
- } else if (Name == "putchar") {
- setDoesNotThrow(F);
- } else if (Name == "popen") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "pclose") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'v':
- if (Name == "vscanf") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "vsscanf" ||
- Name == "vfscanf") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(1)) ||
- !isa<PointerType>(FTy->getParamType(2)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "valloc") {
- if (!isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "vprintf") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "vfprintf" ||
- Name == "vsprintf") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "vsnprintf") {
- if (FTy->getNumParams() != 4 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(2)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 3);
- }
- break;
- case 'o':
- if (Name == "open") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- // May throw; "open" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- } else if (Name == "opendir") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- }
- break;
- case 't':
- if (Name == "tmpfile") {
- if (!isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "times") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'h':
- if (Name == "htonl" ||
- Name == "htons") {
- setDoesNotThrow(F);
- setDoesNotAccessMemory(F);
- }
- break;
- case 'n':
- if (Name == "ntohl" ||
- Name == "ntohs") {
- setDoesNotThrow(F);
- setDoesNotAccessMemory(F);
- }
- break;
- case 'l':
- if (Name == "lstat") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "lchown") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- }
- break;
- case 'q':
- if (Name == "qsort") {
- if (FTy->getNumParams() != 4 ||
- !isa<PointerType>(FTy->getParamType(3)))
- continue;
- // May throw; places call through function pointer.
- setDoesNotCapture(F, 4);
- }
- break;
- case '_':
- if (Name == "__strdup" ||
- Name == "__strndup") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- } else if (Name == "__strtok_r") {
- if (FTy->getNumParams() != 3 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "_IO_getc") {
- if (FTy->getNumParams() != 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "_IO_putc") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- }
- break;
- case 1:
- if (Name == "\1__isoc99_scanf") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "\1stat64" ||
- Name == "\1lstat64" ||
- Name == "\1statvfs64" ||
- Name == "\1__isoc99_sscanf") {
- if (FTy->getNumParams() < 1 ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1fopen64") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getReturnType()) ||
- !isa<PointerType>(FTy->getParamType(0)) ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- setDoesNotCapture(F, 1);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1fseeko64" ||
- Name == "\1ftello64") {
- if (FTy->getNumParams() == 0 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 1);
- } else if (Name == "\1tmpfile64") {
- if (!isa<PointerType>(FTy->getReturnType()))
- continue;
- setDoesNotThrow(F);
- setDoesNotAlias(F, 0);
- } else if (Name == "\1fstat64" ||
- Name == "\1fstatvfs64") {
- if (FTy->getNumParams() != 2 ||
- !isa<PointerType>(FTy->getParamType(1)))
- continue;
- setDoesNotThrow(F);
- setDoesNotCapture(F, 2);
- } else if (Name == "\1open64") {
- if (FTy->getNumParams() < 2 ||
- !isa<PointerType>(FTy->getParamType(0)))
- continue;
- // May throw; "open" is a valid pthread cancellation point.
- setDoesNotCapture(F, 1);
- }
- break;
- }
+ if (F.isDeclaration() && F.hasName())
+ inferPrototypeAttributes(F);
}
return Modified;
}
// * cbrt(sqrt(x)) -> pow(x,1/6)
// * cbrt(sqrt(x)) -> pow(x,1/9)
//
-// cos, cosf, cosl:
-// * cos(-x) -> cos(x)
-//
// exp, expf, expl:
// * exp(log(x)) -> x
//
// * pow(sqrt(x),y) -> pow(x,y*0.5)
// * pow(pow(x,y),z)-> pow(x,y*z)
//
-// puts:
-// * puts("") -> putchar("\n")
-//
// round, roundf, roundl:
// * round(cnst) -> cnst'
//
// * sqrt(Nroot(x)) -> pow(x,1/(2*N))
// * sqrt(pow(x,y)) -> pow(|x|,y*0.5)
//
-// stpcpy:
-// * stpcpy(str, "literal") ->
-// llvm.memcpy(str,"literal",strlen("literal")+1,1)
-// strrchr:
-// * strrchr(s,c) -> reverse_offset_of_in(c,s)
-// (if c is a constant integer and s is a constant string)
-// * strrchr(s1,0) -> strchr(s1,0)
-//
-// strpbrk:
-// * strpbrk(s,a) -> offset_in_for(s,a)
-// (if s and a are both constant strings)
-// * strpbrk(s,"") -> 0
-// * strpbrk(s,a) -> strchr(s,a[0]) (if a is constant string of length 1)
-//
-// strspn, strcspn:
-// * strspn(s,a) -> const_int (if both args are constant)
-// * strspn("",a) -> 0
-// * strspn(s,"") -> 0
-// * strcspn(s,a) -> const_int (if both args are constant)
-// * strcspn("",a) -> 0
-// * strcspn(s,"") -> strlen(a)
-//
+// strchr:
+// * strchr(p, 0) -> strlen(p)
// tan, tanf, tanl:
// * tan(atan(x)) -> x
//