//
// This file implements a simple pass that applies a variety of small
// optimizations for calls to specific well-known function calls (e.g. runtime
-// library functions). For example, a call to the function "exit(3)" that
-// occurs within the main() function can be transformed into a simple "return 3"
-// instruction. Any optimization that takes this form (replace call to library
-// function with simpler code that provides the same result) belongs in this
-// file.
+// library functions). Any optimization that takes the very simple form
+// "replace call to library function with simpler code that provides the same
+// result" belongs in this file.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "simplify-libcalls"
#include "llvm/Transforms/Scalar.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/SmallPtrSet.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Statistic.h"
-#include "llvm/Support/Compiler.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
#include "llvm/Config/config.h"
using namespace llvm;
STATISTIC(NumSimplified, "Number of library calls simplified");
+STATISTIC(NumAnnotated, "Number of attributes added to library functions");
//===----------------------------------------------------------------------===//
// Optimizer Base Class
/// This class is the abstract base class for the set of optimizations that
/// corresponds to one library call.
namespace {
-class VISIBILITY_HIDDEN LibCallOptimization {
+class LibCallOptimization {
protected:
Function *Caller;
const TargetData *TD;
+ LLVMContext* Context;
public:
LibCallOptimization() { }
virtual ~LibCallOptimization() {}
/// performed. If it returns CI, then it transformed the call and CI is to be
/// deleted. If it returns something else, replace CI with the new value and
/// delete CI.
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) =0;
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B)
+ =0;
- Value *OptimizeCall(CallInst *CI, const TargetData &TD, IRBuilder &B) {
+ Value *OptimizeCall(CallInst *CI, const TargetData *TD, IRBuilder<> &B) {
Caller = CI->getParent()->getParent();
- this->TD = &TD;
+ this->TD = TD;
+ 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);
+ 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);
+ Value *EmitStrLen(Value *Ptr, 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);
+ 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);
-
+ 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);
+ 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.
- void EmitPutChar(Value *Char, IRBuilder &B);
+ void 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);
+ 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);
+ 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);
+ 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);
-
+ void EmitFWrite(Value *Ptr, Value *Size, Value *File, IRBuilder<> &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, PointerType::getUnqual(Type::Int8Ty), "cstr");
+Value *LibCallOptimization::CastToCStr(Value *V, IRBuilder<> &B) {
+ return
+ B.CreateBitCast(V, PointerType::getUnqual(Type::getInt8Ty(*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) {
+Value *LibCallOptimization::EmitStrLen(Value *Ptr, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Constant *StrLen =M->getOrInsertFunction("strlen", TD->getIntPtrType(),
- PointerType::getUnqual(Type::Int8Ty),
+ 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),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
NULL);
- return B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen");
+ CallInst *CI = B.CreateCall(StrLen, CastToCStr(Ptr, B), "strlen");
+ if (const Function *F = dyn_cast<Function>(StrLen->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) {
+ unsigned Align, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Intrinsic::ID IID = TD->getIntPtrType() == Type::Int32Ty ?
- Intrinsic::memcpy_i32 : Intrinsic::memcpy_i64;
- Value *MemCpy = Intrinsic::getDeclaration(M, IID);
+ Intrinsic::ID IID = Intrinsic::memcpy;
+ const Type *Tys[1];
+ Tys[0] = Len->getType();
+ Value *MemCpy = Intrinsic::getDeclaration(M, IID, Tys, 1);
return B.CreateCall4(MemCpy, CastToCStr(Dst, B), CastToCStr(Src, B), Len,
- ConstantInt::get(Type::Int32Ty, Align));
+ ConstantInt::get(Type::getInt32Ty(*Context), Align));
}
/// 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) {
+ Value *Len, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Value *MemChr = M->getOrInsertFunction("memchr",
- PointerType::getUnqual(Type::Int8Ty),
- PointerType::getUnqual(Type::Int8Ty),
- Type::Int32Ty, TD->getIntPtrType(),
+ AttributeWithIndex AWI;
+ AWI = AttributeWithIndex::get(~0u, Attribute::ReadOnly | Attribute::NoUnwind);
+
+ Value *MemChr = M->getOrInsertFunction("memchr", AttrListPtr::get(&AWI, 1),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
+ Type::getInt32Ty(*Context), TD->getIntPtrType(*Context),
NULL);
- return B.CreateCall3(MemChr, CastToCStr(Ptr, B), Val, Len, "memchr");
+ 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),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
+ PointerType::getUnqual(Type::getInt8Ty(*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.
/// 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) {
+ IRBuilder<> &B,
+ const AttrListPtr &Attrs) {
char NameBuffer[20];
- if (Op->getType() != Type::DoubleTy) {
+ if (Op->getType() != Type::getDoubleTy(*Context)) {
// 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() == Type::FloatTy)
+ if (Op->getType() == Type::getFloatTy(*Context))
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(),
+ Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
Op->getType(), NULL);
- return B.CreateCall(Callee, Op, Name);
+ 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.
-void LibCallOptimization::EmitPutChar(Value *Char, IRBuilder &B) {
+void LibCallOptimization::EmitPutChar(Value *Char, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Value *F = M->getOrInsertFunction("putchar", Type::Int32Ty,
- Type::Int32Ty, NULL);
- B.CreateCall(F, B.CreateIntCast(Char, Type::Int32Ty, "chari"), "putchar");
+ Value *PutChar = M->getOrInsertFunction("putchar", Type::getInt32Ty(*Context),
+ Type::getInt32Ty(*Context), NULL);
+ CallInst *CI = B.CreateCall(PutChar,
+ B.CreateIntCast(Char, Type::getInt32Ty(*Context), "chari"),
+ "putchar");
+
+ if (const Function *F = dyn_cast<Function>(PutChar->stripPointerCasts()))
+ CI->setCallingConv(F->getCallingConv());
}
/// EmitPutS - Emit a call to the puts function. This assumes that Str is
/// some pointer.
-void LibCallOptimization::EmitPutS(Value *Str, IRBuilder &B) {
+void LibCallOptimization::EmitPutS(Value *Str, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Value *F = M->getOrInsertFunction("puts", Type::Int32Ty,
- PointerType::getUnqual(Type::Int8Ty), NULL);
- B.CreateCall(F, CastToCStr(Str, B), "puts");
+ 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),
+ PointerType::getUnqual(Type::getInt8Ty(*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) {
+void LibCallOptimization::EmitFPutC(Value *Char, Value *File, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Constant *F = M->getOrInsertFunction("fputc", Type::Int32Ty, Type::Int32Ty,
- File->getType(), NULL);
- Char = B.CreateIntCast(Char, Type::Int32Ty, "chari");
- B.CreateCall2(F, Char, File, "fputc");
+ 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), "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) {
+void LibCallOptimization::EmitFPutS(Value *Str, Value *File, IRBuilder<> &B) {
Module *M = Caller->getParent();
- Constant *F = M->getOrInsertFunction("fputs", Type::Int32Ty,
- PointerType::getUnqual(Type::Int8Ty),
- File->getType(), NULL);
- B.CreateCall2(F, CastToCStr(Str, B), File, "fputs");
+ 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),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
+ File->getType(), NULL);
+ else
+ F = M->getOrInsertFunction("fputs", Type::getInt32Ty(*Context),
+ PointerType::getUnqual(Type::getInt8Ty(*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) {
+ IRBuilder<> &B) {
Module *M = Caller->getParent();
- Constant *F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(),
- PointerType::getUnqual(Type::Int8Ty),
- TD->getIntPtrType(), TD->getIntPtrType(),
- File->getType(), NULL);
- B.CreateCall4(F, CastToCStr(Ptr, B), Size,
- ConstantInt::get(TD->getIntPtrType(), 1), File);
+ 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),
+ PointerType::getUnqual(Type::getInt8Ty(*Context)),
+ TD->getIntPtrType(*Context), TD->getIntPtrType(*Context),
+ File->getType(), NULL);
+ else
+ F = M->getOrInsertFunction("fwrite", TD->getIntPtrType(*Context),
+ PointerType::getUnqual(Type::getInt8Ty(*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
//===----------------------------------------------------------------------===//
-/// GetConstantStringInfo - This function computes the length of a
-/// null-terminated C string pointed to by V. If successful, it returns true
-/// and returns the string in Str. If unsuccessful, it returns false.
-static bool GetConstantStringInfo(Value *V, std::string &Str) {
- // Look bitcast instructions.
- if (BitCastInst *BCI = dyn_cast<BitCastInst>(V))
- return GetConstantStringInfo(BCI->getOperand(0), Str);
-
- // If the value is not a GEP instruction nor a constant expression with a
- // GEP instruction, then return false because ConstantArray can't occur
- // any other way
- 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 false;
- GEP = CE;
- } else {
- return false;
- }
-
- // Make sure the GEP has exactly three arguments.
- if (GEP->getNumOperands() != 3)
- return false;
-
- // 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 false;
- } else
- return false;
-
- // 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 false;
-
- // 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())
- return false;
- Constant *GlobalInit = GV->getInitializer();
-
- // Handle the ConstantAggregateZero case
- if (isa<ConstantAggregateZero>(GlobalInit)) {
- // This is a degenerate case. The initializer is constant zero so the
- // length of the string must be zero.
- Str.clear();
- return true;
- }
-
- // Must be a Constant Array
- ConstantArray *Array = dyn_cast<ConstantArray>(GlobalInit);
- if (Array == 0 || Array->getType()->getElementType() != Type::Int8Ty)
- 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 false;
- if (CI->isZero())
- return true; // we found end of string, success!
- Str += (char)CI->getZExtValue();
- }
-
- return false; // The array isn't null terminated.
-}
-
/// 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) {
// 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())
+ if (!GV || !GV->isConstant() || !GV->hasInitializer() ||
+ GV->mayBeOverridden())
return 0;
Constant *GlobalInit = GV->getInitializer();
// Must be a Constant Array
ConstantArray *Array = dyn_cast<ConstantArray>(GlobalInit);
- if (!Array || Array->getType()->getElementType() != Type::Int8Ty)
+ if (!Array ||
+ Array->getType()->getElementType() != Type::getInt8Ty(V->getContext()))
return false;
// Get the number of elements in the array
return true;
}
-//===----------------------------------------------------------------------===//
-// Miscellaneous LibCall Optimizations
-//===----------------------------------------------------------------------===//
-
-//===---------------------------------------===//
-// 'exit' Optimizations
-
-/// ExitOpt - int main() { exit(4); } --> int main() { return 4; }
-struct VISIBILITY_HIDDEN ExitOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
- // Verify we have a reasonable prototype for exit.
- if (Callee->arg_size() == 0 || !CI->use_empty())
- return 0;
-
- // Verify the caller is main, and that the result type of main matches the
- // argument type of exit.
- if (!Caller->isName("main") || !Caller->hasExternalLinkage() ||
- Caller->getReturnType() != CI->getOperand(1)->getType())
- return 0;
-
- TerminatorInst *OldTI = CI->getParent()->getTerminator();
-
- // Create the return after the call.
- ReturnInst *RI = B.CreateRet(CI->getOperand(1));
-
- // Drop all successor phi node entries.
- for (unsigned i = 0, e = OldTI->getNumSuccessors(); i != e; ++i)
- OldTI->getSuccessor(i)->removePredecessor(CI->getParent());
-
- // Erase all instructions from after our return instruction until the end of
- // the block.
- BasicBlock::iterator FirstDead = RI; ++FirstDead;
- CI->getParent()->getInstList().erase(FirstDead, CI->getParent()->end());
- return CI;
- }
-};
-
//===----------------------------------------------------------------------===//
// String and Memory LibCall Optimizations
//===----------------------------------------------------------------------===//
//===---------------------------------------===//
// 'strcat' Optimizations
-
-struct VISIBILITY_HIDDEN StrCatOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() != PointerType::getUnqual(Type::Int8Ty) ||
+ FT->getReturnType() != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
FT->getParamType(0) != FT->getReturnType() ||
FT->getParamType(1) != FT->getReturnType())
return 0;
// See if we can get the length of the input string.
uint64_t Len = GetStringLength(Src);
- if (Len == 0) return false;
+ 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).
- Dst = B.CreateGEP(Dst, DstLen, "endptr");
+ 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(Dst, Src, ConstantInt::get(TD->getIntPtrType(), Len+1), 1, B);
+ EmitMemCpy(CpyDst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len+1), 1, B);
+ }
+};
+
+//===---------------------------------------===//
+// 'strncat' 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() != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
+ FT->getParamType(0) != FT->getReturnType() ||
+ FT->getParamType(1) != FT->getReturnType() ||
+ !isa<IntegerType>(FT->getParamType(2)))
+ return 0;
+
+ // Extract some information from the instruction
+ Value *Dst = CI->getOperand(1);
+ Value *Src = CI->getOperand(2);
+ uint64_t Len;
+
+ // We don't do anything if length is not constant
+ if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(CI->getOperand(3)))
+ Len = LengthArg->getZExtValue();
+ else
+ 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;
+
+ // These optimizations require TargetData.
+ if (!TD) return 0;
+
+ // We don't optimize this case
+ if (Len < SrcLen) return 0;
+
+ // strncat(x, s, c) -> strcat(x, s)
+ // s is constant so the strcat can be optimized further
+ EmitStrLenMemCpy(Src, Dst, SrcLen, B);
return Dst;
}
};
//===---------------------------------------===//
// 'strchr' Optimizations
-struct VISIBILITY_HIDDEN StrChrOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() != PointerType::getUnqual(Type::Int8Ty) ||
+ FT->getReturnType() != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
FT->getParamType(0) != FT->getReturnType())
return 0;
// 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) != Type::Int32Ty) // memchr needs i32.
+ if (Len == 0 || FT->getParamType(1) != Type::getInt32Ty(*Context)) // memchr needs i32.
return 0;
return EmitMemChr(SrcStr, CI->getOperand(2), // include nul.
- ConstantInt::get(TD->getIntPtrType(), Len), B);
+ 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 false;
+ return 0;
// strchr can find the nul character.
Str += '\0';
}
// strchr(s+n,c) -> gep(s+n+i,c)
- Value *Idx = ConstantInt::get(Type::Int64Ty, i);
+ Value *Idx = ConstantInt::get(Type::getInt64Ty(*Context), i);
return B.CreateGEP(SrcStr, Idx, "strchr");
}
};
//===---------------------------------------===//
// 'strcmp' Optimizations
-struct VISIBILITY_HIDDEN StrCmpOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() != Type::Int32Ty ||
+ if (FT->getNumParams() != 2 || FT->getReturnType() != Type::getInt32Ty(*Context) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != PointerType::getUnqual(Type::Int8Ty))
+ FT->getParamType(0) != PointerType::getUnqual(Type::getInt8Ty(*Context)))
return 0;
Value *Str1P = CI->getOperand(1), *Str2P = CI->getOperand(2);
// 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()));
+ 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;
+
+ return EmitMemCmp(Str1P, Str2P,
+ ConstantInt::get(TD->getIntPtrType(*Context),
+ std::min(Len1, Len2)), B);
+ }
+
return 0;
}
};
//===---------------------------------------===//
// 'strncmp' Optimizations
-struct VISIBILITY_HIDDEN StrNCmpOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() != Type::Int32Ty ||
+ if (FT->getNumParams() != 3 || FT->getReturnType() != Type::getInt32Ty(*Context) ||
FT->getParamType(0) != FT->getParamType(1) ||
- FT->getParamType(0) != PointerType::getUnqual(Type::Int8Ty) ||
+ FT->getParamType(0) != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
!isa<IntegerType>(FT->getParamType(2)))
return 0;
//===---------------------------------------===//
// 'strcpy' Optimizations
-struct VISIBILITY_HIDDEN StrCpyOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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) != PointerType::getUnqual(Type::Int8Ty))
+ FT->getParamType(0) != PointerType::getUnqual(Type::getInt8Ty(*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 false;
+ if (Len == 0) return 0;
// 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(), Len), 1, B);
+ EmitMemCpy(Dst, Src,
+ ConstantInt::get(TD->getIntPtrType(*Context), Len), 1, B);
return Dst;
}
};
+//===---------------------------------------===//
+// 'strncpy' Optimizations
+
+struct StrNCpyOpt : 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) ||
+ FT->getParamType(0) != FT->getParamType(1) ||
+ FT->getParamType(0) != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
+ !isa<IntegerType>(FT->getParamType(2)))
+ return 0;
+
+ Value *Dst = CI->getOperand(1);
+ Value *Src = CI->getOperand(2);
+ Value *LenOp = CI->getOperand(3);
+
+ // See if we can get the length of the input string.
+ uint64_t SrcLen = GetStringLength(Src);
+ if (SrcLen == 0) return 0;
+ --SrcLen;
+
+ if (SrcLen == 0) {
+ // strncpy(x, "", y) -> memset(x, '\0', y, 1)
+ EmitMemSet(Dst, ConstantInt::get(Type::getInt8Ty(*Context), '\0'), LenOp, B);
+ return Dst;
+ }
+
+ uint64_t Len;
+ if (ConstantInt *LengthArg = dyn_cast<ConstantInt>(LenOp))
+ Len = LengthArg->getZExtValue();
+ else
+ return 0;
+
+ if (Len == 0) return Dst; // strncpy(x, y, 0) -> x
+
+ // These optimizations require TargetData.
+ 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);
+
+ return Dst;
+ }
+};
//===---------------------------------------===//
// 'strlen' Optimizations
-struct VISIBILITY_HIDDEN StrLenOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct StrLenOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
if (FT->getNumParams() != 1 ||
- FT->getParamType(0) != PointerType::getUnqual(Type::Int8Ty) ||
+ FT->getParamType(0) != PointerType::getUnqual(Type::getInt8Ty(*Context)) ||
!isa<IntegerType>(FT->getReturnType()))
return 0;
}
};
+//===---------------------------------------===//
+// 'strto*' Optimizations
+
+struct StrToOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ const FunctionType *FT = Callee->getFunctionType();
+ if ((FT->getNumParams() != 2 && FT->getNumParams() != 3) ||
+ !isa<PointerType>(FT->getParamType(0)) ||
+ !isa<PointerType>(FT->getParamType(1)))
+ return 0;
+
+ Value *EndPtr = CI->getOperand(2);
+ if (isa<ConstantPointerNull>(EndPtr)) {
+ CI->setOnlyReadsMemory();
+ CI->addAttribute(1, Attribute::NoCapture);
+ }
+
+ return 0;
+ }
+};
+
+
//===---------------------------------------===//
// 'memcmp' Optimizations
-struct VISIBILITY_HIDDEN MemCmpOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() != Type::Int32Ty)
+ FT->getReturnType() != Type::getInt32Ty(*Context))
return 0;
-
+
Value *LHS = CI->getOperand(1), *RHS = CI->getOperand(2);
-
+
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));
- if (!LenC) return false;
+ 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.CreateZExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
+ return B.CreateSExt(B.CreateSub(LHSV, RHSV, "chardiff"), CI->getType());
}
-
+
// memcmp(S1,S2,2) != 0 -> (*(short*)LHS ^ *(short*)RHS) != 0
// memcmp(S1,S2,4) != 0 -> (*(int*)LHS ^ *(int*)RHS) != 0
if ((Len == 2 || Len == 4) && IsOnlyUsedInZeroEqualityComparison(CI)) {
- LHS = B.CreateBitCast(LHS, PointerType::getUnqual(Type::Int16Ty), "tmp");
- RHS = B.CreateBitCast(RHS, LHS->getType(), "tmp");
+ const Type *PTy = PointerType::getUnqual(Len == 2 ?
+ Type::getInt16Ty(*Context) : Type::getInt32Ty(*Context));
+ LHS = B.CreateBitCast(LHS, PTy, "tmp");
+ RHS = B.CreateBitCast(RHS, PTy, "tmp");
LoadInst *LHSV = B.CreateLoad(LHS, "lhsv");
LoadInst *RHSV = B.CreateLoad(RHS, "rhsv");
LHSV->setAlignment(1); RHSV->setAlignment(1); // Unaligned loads.
return B.CreateZExt(B.CreateXor(LHSV, RHSV, "shortdiff"), CI->getType());
}
-
+
return 0;
}
};
//===---------------------------------------===//
// 'memcpy' Optimizations
-struct VISIBILITY_HIDDEN MemCpyOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct MemCpyOpt : 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() != 3 || FT->getReturnType() != FT->getParamType(0) ||
!isa<PointerType>(FT->getParamType(0)) ||
!isa<PointerType>(FT->getParamType(1)) ||
- FT->getParamType(2) != TD->getIntPtrType())
+ FT->getParamType(2) != TD->getIntPtrType(*Context))
return 0;
// memcpy(x, y, n) -> llvm.memcpy(x, y, n, 1)
}
};
+//===---------------------------------------===//
+// 'memmove' Optimizations
+
+struct MemMoveOpt : 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() != 3 || FT->getReturnType() != FT->getParamType(0) ||
+ !isa<PointerType>(FT->getParamType(0)) ||
+ !isa<PointerType>(FT->getParamType(1)) ||
+ FT->getParamType(2) != TD->getIntPtrType(*Context))
+ return 0;
+
+ // memmove(x, y, n) -> llvm.memmove(x, y, n, 1)
+ Module *M = Caller->getParent();
+ Intrinsic::ID IID = Intrinsic::memmove;
+ const Type *Tys[1];
+ Tys[0] = TD->getIntPtrType(*Context);
+ Value *MemMove = Intrinsic::getDeclaration(M, IID, Tys, 1);
+ Value *Dst = CastToCStr(CI->getOperand(1), B);
+ Value *Src = CastToCStr(CI->getOperand(2), B);
+ Value *Size = CI->getOperand(3);
+ Value *Align = ConstantInt::get(Type::getInt32Ty(*Context), 1);
+ B.CreateCall4(MemMove, Dst, Src, Size, Align);
+ return CI->getOperand(1);
+ }
+};
+
+//===---------------------------------------===//
+// 'memset' Optimizations
+
+struct MemSetOpt : 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() != 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);
+ }
+};
+
//===----------------------------------------------------------------------===//
// Math Library Optimizations
//===----------------------------------------------------------------------===//
//===---------------------------------------===//
// 'pow*' Optimizations
-struct VISIBILITY_HIDDEN PowOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct PowOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
// Just make sure this has 2 arguments of the same FP type, which match the
// result type.
if (Op1C->isExactlyValue(1.0)) // pow(1.0, x) -> 1.0
return Op1C;
if (Op1C->isExactlyValue(2.0)) // pow(2.0, x) -> exp2(x)
- return EmitUnaryFloatFnCall(Op2, "exp2", B);
+ return EmitUnaryFloatFnCall(Op2, "exp2", B, CI->getAttributes());
}
ConstantFP *Op2C = dyn_cast<ConstantFP>(Op2);
return ConstantFP::get(CI->getType(), 1.0);
if (Op2C->isExactlyValue(0.5)) {
- // FIXME: This is not safe for -0.0 and -inf. This can only be done when
- // 'unsafe' math optimizations are allowed.
- // x pow(x, 0.5) sqrt(x)
- // ---------------------------------------------
- // -0.0 +0.0 -0.0
- // -inf +inf NaN
-#if 0
- // pow(x, 0.5) -> sqrt(x)
- return B.CreateCall(get_sqrt(), Op1, "sqrt");
-#endif
+ // 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.
+ // 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::getInf(CI->getType());
+ Value *NegInf = ConstantFP::getInf(CI->getType(), true);
+ Value *Sqrt = EmitUnaryFloatFnCall(Op1, "sqrt", B, CI->getAttributes());
+ Value *FAbs = EmitUnaryFloatFnCall(Sqrt, "fabs", B, CI->getAttributes());
+ Value *FCmp = B.CreateFCmpOEQ(Op1, NegInf, "tmp");
+ Value *Sel = B.CreateSelect(FCmp, Inf, FAbs, "tmp");
+ return Sel;
}
if (Op2C->isExactlyValue(1.0)) // pow(x, 1.0) -> x
return Op1;
if (Op2C->isExactlyValue(2.0)) // pow(x, 2.0) -> x*x
- return B.CreateMul(Op1, Op1, "pow2");
+ return B.CreateFMul(Op1, Op1, "pow2");
if (Op2C->isExactlyValue(-1.0)) // pow(x, -1.0) -> 1.0/x
- return B.CreateFDiv(ConstantFP::get(CI->getType(), 1.0), Op1, "powrecip");
+ return B.CreateFDiv(ConstantFP::get(CI->getType(), 1.0),
+ Op1, "powrecip");
return 0;
}
};
//===---------------------------------------===//
-// Double -> Float Shrinking Optimizations for Unary Functions like 'floor'
+// 'exp2' Optimizations
-struct VISIBILITY_HIDDEN UnaryDoubleFPOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct Exp2Opt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
- if (FT->getNumParams() != 1 || FT->getReturnType() != Type::DoubleTy ||
- FT->getParamType(0) != Type::DoubleTy)
+ // 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;
+ Value *Op = CI->getOperand(1);
+ // 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");
+ } 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");
+ }
+
+ if (LdExpArg) {
+ const char *Name;
+ if (Op->getType() == Type::getFloatTy(*Context))
+ Name = "ldexpf";
+ else if (Op->getType() == Type::getDoubleTy(*Context))
+ Name = "ldexp";
+ else
+ Name = "ldexpl";
+
+ Constant *One = ConstantFP::get(*Context, APFloat(1.0f));
+ if (Op->getType() != Type::getFloatTy(*Context))
+ One = ConstantExpr::getFPExtend(One, Op->getType());
+
+ Module *M = Caller->getParent();
+ Value *Callee = M->getOrInsertFunction(Name, Op->getType(),
+ Op->getType(), Type::getInt32Ty(*Context),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() != Type::getDoubleTy(*Context) ||
+ FT->getParamType(0) != Type::getDoubleTy(*Context))
+ 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() != Type::FloatTy)
+ if (Cast == 0 || Cast->getOperand(0)->getType() != Type::getFloatTy(*Context))
return 0;
// floor((double)floatval) -> (double)floorf(floatval)
Value *V = Cast->getOperand(0);
- V = EmitUnaryFloatFnCall(V, Callee->getNameStart(), B);
- return B.CreateFPExt(V, Type::DoubleTy);
+ V = EmitUnaryFloatFnCall(V, Callee->getName().data(), B, CI->getAttributes());
+ return B.CreateFPExt(V, Type::getDoubleTy(*Context));
}
};
//===---------------------------------------===//
// 'ffs*' Optimizations
-struct VISIBILITY_HIDDEN FFSOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct FFSOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const 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() != Type::Int32Ty ||
+ if (FT->getNumParams() != 1 || FT->getReturnType() != Type::getInt32Ty(*Context) ||
!isa<IntegerType>(FT->getParamType(0)))
return 0;
if (ConstantInt *CI = dyn_cast<ConstantInt>(Op)) {
if (CI->getValue() == 0) // ffs(0) -> 0.
return Constant::getNullValue(CI->getType());
- return ConstantInt::get(Type::Int32Ty, // ffs(c) -> cttz(c)+1
+ return ConstantInt::get(Type::getInt32Ty(*Context), // ffs(c) -> cttz(c)+1
CI->getValue().countTrailingZeros()+1);
}
Value *F = Intrinsic::getDeclaration(Callee->getParent(),
Intrinsic::cttz, &ArgType, 1);
Value *V = B.CreateCall(F, Op, "cttz");
- V = B.CreateAdd(V, ConstantInt::get(Type::Int32Ty, 1), "tmp");
- V = B.CreateIntCast(V, Type::Int32Ty, false, "tmp");
+ 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::Int32Ty, 0));
+ return B.CreateSelect(Cond, V, ConstantInt::get(Type::getInt32Ty(*Context), 0));
}
};
//===---------------------------------------===//
// 'isdigit' Optimizations
-struct VISIBILITY_HIDDEN IsDigitOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct IsDigitOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
- FT->getParamType(0) != Type::Int32Ty)
+ FT->getParamType(0) != Type::getInt32Ty(*Context))
return 0;
// isdigit(c) -> (c-'0') <u 10
Value *Op = CI->getOperand(1);
- Op = B.CreateSub(Op, ConstantInt::get(Type::Int32Ty, '0'), "isdigittmp");
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::Int32Ty, 10), "isdigit");
+ Op = B.CreateSub(Op, ConstantInt::get(Type::getInt32Ty(*Context), '0'),
+ "isdigittmp");
+ Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 10),
+ "isdigit");
return B.CreateZExt(Op, CI->getType());
}
};
//===---------------------------------------===//
// 'isascii' Optimizations
-struct VISIBILITY_HIDDEN IsAsciiOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct IsAsciiOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
// We require integer(i32)
if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
- FT->getParamType(0) != Type::Int32Ty)
+ FT->getParamType(0) != Type::getInt32Ty(*Context))
return 0;
// isascii(c) -> c <u 128
Value *Op = CI->getOperand(1);
- Op = B.CreateICmpULT(Op, ConstantInt::get(Type::Int32Ty, 128), "isascii");
+ Op = B.CreateICmpULT(Op, ConstantInt::get(Type::getInt32Ty(*Context), 128),
+ "isascii");
return B.CreateZExt(Op, CI->getType());
}
};
+
+//===---------------------------------------===//
+// 'abs', 'labs', 'llabs' Optimizations
+
+struct AbsOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ const FunctionType *FT = Callee->getFunctionType();
+ // We require integer(integer) where the types agree.
+ if (FT->getNumParams() != 1 || !isa<IntegerType>(FT->getReturnType()) ||
+ 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()),
+ "ispos");
+ Value *Neg = B.CreateNeg(Op, "neg");
+ return B.CreateSelect(Pos, Op, Neg);
+ }
+};
+
//===---------------------------------------===//
// 'toascii' Optimizations
-struct VISIBILITY_HIDDEN ToAsciiOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct ToAsciiOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
const FunctionType *FT = Callee->getFunctionType();
// We require i32(i32)
if (FT->getNumParams() != 1 || FT->getReturnType() != FT->getParamType(0) ||
- FT->getParamType(0) != Type::Int32Ty)
+ FT->getParamType(0) != Type::getInt32Ty(*Context))
return 0;
// isascii(c) -> c & 0x7f
- return B.CreateAnd(CI->getOperand(1), ConstantInt::get(CI->getType(),0x7F));
+ return B.CreateAnd(CI->getOperand(1),
+ ConstantInt::get(CI->getType(),0x7F));
}
};
//===---------------------------------------===//
// 'printf' Optimizations
-struct VISIBILITY_HIDDEN PrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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() == Type::VoidTy))
+ FT->getReturnType() == Type::getVoidTy(*Context)))
return 0;
// Check for a fixed format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(1), FormatStr))
- return false;
+ return 0;
// Empty format string -> noop.
if (FormatStr.empty()) // Tolerate printf's declared void.
- return CI->use_empty() ? (Value*)CI : ConstantInt::get(CI->getType(), 0);
+ return CI->use_empty() ? (Value*)CI :
+ ConstantInt::get(CI->getType(), 0);
// printf("x") -> putchar('x'), even for '%'.
if (FormatStr.size() == 1) {
- EmitPutChar(ConstantInt::get(Type::Int32Ty, FormatStr[0]), B);
- return CI->use_empty() ? (Value*)CI : ConstantInt::get(CI->getType(), 1);
+ EmitPutChar(ConstantInt::get(Type::getInt32Ty(*Context), FormatStr[0]), B);
+ return CI->use_empty() ? (Value*)CI :
+ ConstantInt::get(CI->getType(), 1);
}
// printf("foo\n") --> puts("foo")
// 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(FormatStr, true);
- C = new GlobalVariable(C->getType(), true,GlobalVariable::InternalLinkage,
- C, "str", Callee->getParent());
+ 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);
+ ConstantInt::get(CI->getType(), FormatStr.size()+1);
}
// Optimize specific format strings.
if (FormatStr == "%c" && CI->getNumOperands() > 2 &&
isa<IntegerType>(CI->getOperand(2)->getType())) {
EmitPutChar(CI->getOperand(2), B);
- return CI->use_empty() ? (Value*)CI : ConstantInt::get(CI->getType(), 1);
+ return CI->use_empty() ? (Value*)CI :
+ ConstantInt::get(CI->getType(), 1);
}
// printf("%s\n", str) --> puts(str)
//===---------------------------------------===//
// 'sprintf' Optimizations
-struct VISIBILITY_HIDDEN SPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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)) ||
// Check for a fixed format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
- return false;
+ return 0;
// If we just have a format string (nothing else crazy) transform it.
if (CI->getNumOperands() == 3) {
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.
+ 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(), FormatStr.size()+1),1,B);
+ ConstantInt::get(TD->getIntPtrType(*Context), FormatStr.size()+1),1,B);
return ConstantInt::get(CI->getType(), FormatStr.size());
}
// Decode the second character of the format string.
if (FormatStr[1] == 'c') {
- // sprintf(dst, "%c", chr) --> *(i8*)dst = chr
+ // 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::Int8Ty, "char");
- B.CreateStore(V, CastToCStr(CI->getOperand(1), B));
+ Value *V = B.CreateTrunc(CI->getOperand(3), Type::getInt8Ty(*Context), "char");
+ Value *Ptr = CastToCStr(CI->getOperand(1), B);
+ B.CreateStore(V, Ptr);
+ Ptr = B.CreateGEP(Ptr, ConstantInt::get(Type::getInt32Ty(*Context), 1), "nul");
+ B.CreateStore(Constant::getNullValue(Type::getInt8Ty(*Context)), Ptr);
+
return ConstantInt::get(CI->getType(), 1);
}
if (FormatStr[1] == 's') {
+ // These optimizations require TargetData.
+ 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;
Value *Len = EmitStrLen(CI->getOperand(3), B);
- Value *IncLen = B.CreateAdd(Len, ConstantInt::get(Len->getType(), 1),
+ Value *IncLen = B.CreateAdd(Len,
+ ConstantInt::get(Len->getType(), 1),
"leninc");
EmitMemCpy(CI->getOperand(1), CI->getOperand(3), IncLen, 1, B);
//===---------------------------------------===//
// 'fwrite' Optimizations
-struct VISIBILITY_HIDDEN FWriteOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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)) ||
//===---------------------------------------===//
// 'fputs' Optimizations
-struct VISIBILITY_HIDDEN FPutsOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+struct FPutsOpt : public LibCallOptimization {
+ virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder<> &B) {
+ // These optimizations require TargetData.
+ 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)) ||
// fputs(s,F) --> fwrite(s,1,strlen(s),F)
uint64_t Len = GetStringLength(CI->getOperand(1));
- if (!Len) return false;
- EmitFWrite(CI->getOperand(1), ConstantInt::get(TD->getIntPtrType(), Len-1),
+ 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).
}
//===---------------------------------------===//
// 'fprintf' Optimizations
-struct VISIBILITY_HIDDEN FPrintFOpt : public LibCallOptimization {
- virtual Value *CallOptimizer(Function *Callee, CallInst *CI, IRBuilder &B) {
+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)) ||
// All the optimizations depend on the format string.
std::string FormatStr;
if (!GetConstantStringInfo(CI->getOperand(2), FormatStr))
- return false;
+ return 0;
// fprintf(F, "foo") --> fwrite("foo", 3, 1, F)
if (CI->getNumOperands() == 3) {
for (unsigned i = 0, e = FormatStr.size(); i != e; ++i)
if (FormatStr[i] == '%') // Could handle %% -> % if we cared.
- return false; // We found a format specifier.
-
- EmitFWrite(CI->getOperand(2), ConstantInt::get(TD->getIntPtrType(),
+ return 0; // We found a format specifier.
+
+ // These optimizations require TargetData.
+ 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());
}
};
+} // end anonymous namespace.
//===----------------------------------------------------------------------===//
// SimplifyLibCalls Pass Implementation
namespace {
/// This pass optimizes well known library functions from libc and libm.
///
- class VISIBILITY_HIDDEN SimplifyLibCalls : public FunctionPass {
+ class SimplifyLibCalls : public FunctionPass {
StringMap<LibCallOptimization*> Optimizations;
- // Miscellaneous LibCall Optimizations
- ExitOpt Exit;
// String and Memory LibCall Optimizations
- StrCatOpt StrCat; StrChrOpt StrChr; StrCmpOpt StrCmp; StrNCmpOpt StrNCmp;
- StrCpyOpt StrCpy; StrLenOpt StrLen; MemCmpOpt MemCmp; MemCpyOpt MemCpy;
+ StrCatOpt StrCat; StrNCatOpt StrNCat; StrChrOpt StrChr; StrCmpOpt StrCmp;
+ StrNCmpOpt StrNCmp; StrCpyOpt StrCpy; StrNCpyOpt StrNCpy; StrLenOpt StrLen;
+ StrToOpt StrTo; MemCmpOpt MemCmp; MemCpyOpt MemCpy; MemMoveOpt MemMove;
+ MemSetOpt MemSet;
// Math Library Optimizations
- PowOpt Pow; UnaryDoubleFPOpt UnaryDoubleFP;
+ PowOpt Pow; Exp2Opt Exp2; UnaryDoubleFPOpt UnaryDoubleFP;
// Integer Optimizations
- FFSOpt FFS; IsDigitOpt IsDigit; IsAsciiOpt IsAscii; ToAsciiOpt ToAscii;
+ FFSOpt FFS; AbsOpt Abs; IsDigitOpt IsDigit; IsAsciiOpt IsAscii;
+ ToAsciiOpt ToAscii;
// Formatting and IO Optimizations
SPrintFOpt SPrintF; PrintFOpt PrintF;
FWriteOpt FWrite; FPutsOpt FPuts; FPrintFOpt FPrintF;
+
+ bool Modified; // This is only used by doInitialization.
public:
static char ID; // Pass identification
- SimplifyLibCalls() : FunctionPass((intptr_t)&ID) {}
+ SimplifyLibCalls() : FunctionPass(&ID) {}
void InitOptimizations();
bool runOnFunction(Function &F);
+ void setDoesNotAccessMemory(Function &F);
+ void setOnlyReadsMemory(Function &F);
+ void setDoesNotThrow(Function &F);
+ void setDoesNotCapture(Function &F, unsigned n);
+ void setDoesNotAlias(Function &F, unsigned n);
+ bool doInitialization(Module &M);
+
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.addRequired<TargetData>();
}
};
char SimplifyLibCalls::ID = 0;
/// Optimizations - Populate the Optimizations map with all the optimizations
/// we know.
void SimplifyLibCalls::InitOptimizations() {
- // Miscellaneous LibCall Optimizations
- Optimizations["exit"] = &Exit;
-
// 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["strlen"] = &StrLen;
+ Optimizations["strtol"] = &StrTo;
+ Optimizations["strtod"] = &StrTo;
+ Optimizations["strtof"] = &StrTo;
+ Optimizations["strtoul"] = &StrTo;
+ Optimizations["strtoll"] = &StrTo;
+ Optimizations["strtold"] = &StrTo;
+ Optimizations["strtoull"] = &StrTo;
Optimizations["memcmp"] = &MemCmp;
Optimizations["memcpy"] = &MemCpy;
+ Optimizations["memmove"] = &MemMove;
+ Optimizations["memset"] = &MemSet;
// Math Library Optimizations
Optimizations["powf"] = &Pow;
Optimizations["pow"] = &Pow;
Optimizations["powl"] = &Pow;
+ Optimizations["llvm.pow.f32"] = &Pow;
+ Optimizations["llvm.pow.f64"] = &Pow;
+ Optimizations["llvm.pow.f80"] = &Pow;
+ Optimizations["llvm.pow.f128"] = &Pow;
+ Optimizations["llvm.pow.ppcf128"] = &Pow;
+ Optimizations["exp2l"] = &Exp2;
+ Optimizations["exp2"] = &Exp2;
+ Optimizations["exp2f"] = &Exp2;
+ Optimizations["llvm.exp2.ppcf128"] = &Exp2;
+ Optimizations["llvm.exp2.f128"] = &Exp2;
+ Optimizations["llvm.exp2.f80"] = &Exp2;
+ Optimizations["llvm.exp2.f64"] = &Exp2;
+ Optimizations["llvm.exp2.f32"] = &Exp2;
+
#ifdef HAVE_FLOORF
Optimizations["floor"] = &UnaryDoubleFP;
#endif
Optimizations["ffs"] = &FFS;
Optimizations["ffsl"] = &FFS;
Optimizations["ffsll"] = &FFS;
+ Optimizations["abs"] = &Abs;
+ Optimizations["labs"] = &Abs;
+ Optimizations["llabs"] = &Abs;
Optimizations["isdigit"] = &IsDigit;
Optimizations["isascii"] = &IsAscii;
Optimizations["toascii"] = &ToAscii;
if (Optimizations.empty())
InitOptimizations();
- const TargetData &TD = getAnalysis<TargetData>();
+ const TargetData *TD = getAnalysisIfAvailable<TargetData>();
- IRBuilder Builder;
+ IRBuilder<> Builder(F.getContext());
bool Changed = false;
for (Function::iterator BB = F.begin(), E = F.end(); BB != E; ++BB) {
continue;
// Ignore unknown calls.
- const char *CalleeName = Callee->getNameStart();
- StringMap<LibCallOptimization*>::iterator OMI =
- Optimizations.find(CalleeName, CalleeName+Callee->getNameLen());
- if (OMI == Optimizations.end()) continue;
+ LibCallOptimization *LCO = Optimizations.lookup(Callee->getName());
+ if (!LCO) continue;
// Set the builder to the instruction after the call.
Builder.SetInsertPoint(BB, I);
// Try to optimize this call.
- Value *Result = OMI->second->OptimizeCall(CI, TD, Builder);
+ Value *Result = LCO->OptimizeCall(CI, TD, Builder);
if (Result == 0) continue;
+ DEBUG(errs() << "SimplifyLibCalls simplified: " << *CI;
+ errs() << " into: " << *Result << "\n");
+
// Something changed!
Changed = true;
++NumSimplified;
return Changed;
}
+// Utility methods for doInitialization.
+
+void SimplifyLibCalls::setDoesNotAccessMemory(Function &F) {
+ if (!F.doesNotAccessMemory()) {
+ F.setDoesNotAccessMemory();
+ ++NumAnnotated;
+ Modified = true;
+ }
+}
+void SimplifyLibCalls::setOnlyReadsMemory(Function &F) {
+ if (!F.onlyReadsMemory()) {
+ F.setOnlyReadsMemory();
+ ++NumAnnotated;
+ Modified = true;
+ }
+}
+void SimplifyLibCalls::setDoesNotThrow(Function &F) {
+ if (!F.doesNotThrow()) {
+ F.setDoesNotThrow();
+ ++NumAnnotated;
+ Modified = true;
+ }
+}
+void SimplifyLibCalls::setDoesNotCapture(Function &F, unsigned n) {
+ if (!F.doesNotCapture(n)) {
+ F.setDoesNotCapture(n);
+ ++NumAnnotated;
+ Modified = true;
+ }
+}
+void SimplifyLibCalls::setDoesNotAlias(Function &F, unsigned n) {
+ if (!F.doesNotAlias(n)) {
+ F.setDoesNotAlias(n);
+ ++NumAnnotated;
+ Modified = true;
+ }
+}
+
+/// 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;
+ }
+ }
+ return Modified;
+}
// TODO:
// Additional cases that we need to add to this file:
// * memcmp(x,y,l) -> cnst
// (if all arguments are constant and strlen(x) <= l and strlen(y) <= l)
//
-// memmove:
-// * memmove(d,s,l,a) -> memcpy(d,s,l,a)
-// (if s is a global constant array)
-//
// pow, powf, powl:
// * pow(exp(x),y) -> exp(x*y)
// * pow(sqrt(x),y) -> pow(x,y*0.5)
// (if c is a constant integer and s is a constant string)
// * strrchr(s1,0) -> strchr(s1,0)
//
-// strncat:
-// * strncat(x,y,0) -> x
-// * strncat(x,y,0) -> x (if strlen(y) = 0)
-// * strncat(x,y,l) -> strcat(x,y) (if y and l are constants an l > strlen(y))
-//
-// strncpy:
-// * strncpy(d,s,0) -> d
-// * strncpy(d,s,l) -> memcpy(d,s,l,1)
-// (if s and l are constants)
-//
// strpbrk:
// * strpbrk(s,a) -> offset_in_for(s,a)
// (if s and a are both constant strings)
projects / oota-llvm.git / blobdiff