-//===-- ConstantFolding.cpp - Analyze constant folding possibilities ------===//
+//===-- ConstantFolding.cpp - Fold instructions into constants ------------===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This family of functions determines the possibility of performing constant
-// folding.
+// This file defines routines for folding instructions into constants.
+//
+// Also, to supplement the basic VMCore ConstantExpr simplifications,
+// this file defines some additional folding routines that can make use of
+// TargetData information. These functions cannot go in VMCore due to library
+// dependency issues.
//
//===----------------------------------------------------------------------===//
#include "llvm/Constants.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
+#include "llvm/GlobalVariable.h"
#include "llvm/Instructions.h"
#include "llvm/Intrinsics.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Analysis/ValueTracking.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/MathExtras.h"
#include <cerrno>
Offset += TD.getStructLayout(ST)->getElementOffset(CI->getZExtValue());
} else {
const SequentialType *SQT = cast<SequentialType>(*GTI);
- Offset += TD.getABITypeSize(SQT->getElementType())*CI->getSExtValue();
+ Offset += TD.getTypeAllocSize(SQT->getElementType())*CI->getSExtValue();
}
}
return true;
return false;
}
+/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would
+/// produce if it is constant and determinable. If this is not determinable,
+/// return null.
+Constant *llvm::ConstantFoldLoadFromConstPtr(Constant *C,
+ const TargetData *TD) {
+ // First, try the easy cases:
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(C))
+ if (GV->isConstant() && GV->hasDefinitiveInitializer())
+ return GV->getInitializer();
+
+ // If the loaded value isn't a constant expr, we can't handle it.
+ ConstantExpr *CE = dyn_cast<ConstantExpr>(C);
+ if (!CE) return 0;
+
+ if (CE->getOpcode() == Instruction::GetElementPtr) {
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getOperand(0)))
+ if (GV->isConstant() && GV->hasDefinitiveInitializer())
+ if (Constant *V =
+ ConstantFoldLoadThroughGEPConstantExpr(GV->getInitializer(), CE))
+ return V;
+ }
+
+ // Instead of loading constant c string, use corresponding integer value
+ // directly if string length is small enough.
+ std::string Str;
+ if (TD && GetConstantStringInfo(CE->getOperand(0), Str) && !Str.empty()) {
+ unsigned len = Str.length();
+ const Type *Ty = cast<PointerType>(CE->getType())->getElementType();
+ unsigned numBits = Ty->getPrimitiveSizeInBits();
+ // Replace LI with immediate integer store.
+ if ((numBits >> 3) == len + 1) {
+ APInt StrVal(numBits, 0);
+ APInt SingleChar(numBits, 0);
+ if (TD->isLittleEndian()) {
+ for (signed i = len-1; i >= 0; i--) {
+ SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
+ StrVal = (StrVal << 8) | SingleChar;
+ }
+ } else {
+ for (unsigned i = 0; i < len; i++) {
+ SingleChar = (uint64_t) Str[i] & UCHAR_MAX;
+ StrVal = (StrVal << 8) | SingleChar;
+ }
+ // Append NULL at the end.
+ SingleChar = 0;
+ StrVal = (StrVal << 8) | SingleChar;
+ }
+ return ConstantInt::get(CE->getContext(), StrVal);
+ }
+ }
+
+ // If this load comes from anywhere in a constant global, and if the global
+ // is all undef or zero, we know what it loads.
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(CE->getUnderlyingObject())){
+ if (GV->isConstant() && GV->hasDefinitiveInitializer()) {
+ const Type *ResTy = cast<PointerType>(C->getType())->getElementType();
+ if (GV->getInitializer()->isNullValue())
+ return Constant::getNullValue(ResTy);
+ if (isa<UndefValue>(GV->getInitializer()))
+ return UndefValue::get(ResTy);
+ }
+ }
+
+ return 0;
+}
+
+static Constant *ConstantFoldLoadInst(const LoadInst *LI, const TargetData *TD){
+ if (LI->isVolatile()) return 0;
+
+ if (Constant *C = dyn_cast<Constant>(LI->getOperand(0)))
+ return ConstantFoldLoadFromConstPtr(C, TD);
+
+ return 0;
+}
/// SymbolicallyEvaluateBinop - One of Op0/Op1 is a constant expression.
-/// Attempt to symbolically evaluate the result of a binary operator merging
+/// Attempt to symbolically evaluate the result of a binary operator merging
/// these together. If target data info is available, it is provided as TD,
/// otherwise TD is null.
static Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0,
- Constant *Op1, const TargetData *TD){
+ Constant *Op1, const TargetData *TD,
+ LLVMContext &Context){
// SROA
// Fold (and 0xffffffff00000000, (shl x, 32)) -> shl.
}
}
- // TODO: Fold icmp setne/seteq as well.
return 0;
}
/// constant expression, do so.
static Constant *SymbolicallyEvaluateGEP(Constant* const* Ops, unsigned NumOps,
const Type *ResultTy,
+ LLVMContext &Context,
const TargetData *TD) {
Constant *Ptr = Ops[0];
if (!TD || !cast<PointerType>(Ptr->getType())->getElementType()->isSized())
return 0;
-
- uint64_t BasePtr = 0;
+
+ unsigned BitWidth = TD->getTypeSizeInBits(TD->getIntPtrType(Context));
+ APInt BasePtr(BitWidth, 0);
+ bool BaseIsInt = true;
if (!Ptr->isNullValue()) {
// If this is a inttoptr from a constant int, we can fold this as the base,
// otherwise we can't.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ptr))
if (CE->getOpcode() == Instruction::IntToPtr)
- if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0)))
- BasePtr = Base->getZExtValue();
+ if (ConstantInt *Base = dyn_cast<ConstantInt>(CE->getOperand(0))) {
+ BasePtr = Base->getValue();
+ BasePtr.zextOrTrunc(BitWidth);
+ }
if (BasePtr == 0)
- return 0;
+ BaseIsInt = false;
}
// If this is a constant expr gep that is effectively computing an
// "offsetof", fold it into 'cast int Size to T*' instead of 'gep 0, 0, 12'
for (unsigned i = 1; i != NumOps; ++i)
if (!isa<ConstantInt>(Ops[i]))
- return false;
+ return 0;
- uint64_t Offset = TD->getIndexedOffset(Ptr->getType(),
- (Value**)Ops+1, NumOps-1);
- Constant *C = ConstantInt::get(TD->getIntPtrType(), Offset+BasePtr);
- return ConstantExpr::getIntToPtr(C, ResultTy);
+ APInt Offset = APInt(BitWidth,
+ TD->getIndexedOffset(Ptr->getType(),
+ (Value**)Ops+1, NumOps-1));
+ // If the base value for this address is a literal integer value, fold the
+ // getelementptr to the resulting integer value casted to the pointer type.
+ if (BaseIsInt) {
+ Constant *C = ConstantInt::get(Context, Offset+BasePtr);
+ return ConstantExpr::getIntToPtr(C, ResultTy);
+ }
+
+ // Otherwise form a regular getelementptr. Recompute the indices so that
+ // we eliminate over-indexing of the notional static type array bounds.
+ // This makes it easy to determine if the getelementptr is "inbounds".
+ // Also, this helps GlobalOpt do SROA on GlobalVariables.
+ const Type *Ty = Ptr->getType();
+ SmallVector<Constant*, 32> NewIdxs;
+ do {
+ if (const SequentialType *ATy = dyn_cast<SequentialType>(Ty)) {
+ // The only pointer indexing we'll do is on the first index of the GEP.
+ if (isa<PointerType>(ATy) && !NewIdxs.empty())
+ break;
+ // Determine which element of the array the offset points into.
+ APInt ElemSize(BitWidth, TD->getTypeAllocSize(ATy->getElementType()));
+ if (ElemSize == 0)
+ return 0;
+ APInt NewIdx = Offset.udiv(ElemSize);
+ Offset -= NewIdx * ElemSize;
+ NewIdxs.push_back(ConstantInt::get(TD->getIntPtrType(Context), NewIdx));
+ Ty = ATy->getElementType();
+ } else if (const StructType *STy = dyn_cast<StructType>(Ty)) {
+ // Determine which field of the struct the offset points into. The
+ // getZExtValue is at least as safe as the StructLayout API because we
+ // know the offset is within the struct at this point.
+ const StructLayout &SL = *TD->getStructLayout(STy);
+ unsigned ElIdx = SL.getElementContainingOffset(Offset.getZExtValue());
+ NewIdxs.push_back(ConstantInt::get(Type::getInt32Ty(Context), ElIdx));
+ Offset -= APInt(BitWidth, SL.getElementOffset(ElIdx));
+ Ty = STy->getTypeAtIndex(ElIdx);
+ } else {
+ // We've reached some non-indexable type.
+ break;
+ }
+ } while (Ty != cast<PointerType>(ResultTy)->getElementType());
+
+ // If we haven't used up the entire offset by descending the static
+ // type, then the offset is pointing into the middle of an indivisible
+ // member, so we can't simplify it.
+ if (Offset != 0)
+ return 0;
+
+ // Create a GEP.
+ Constant *C =
+ ConstantExpr::getGetElementPtr(Ptr, &NewIdxs[0], NewIdxs.size());
+ assert(cast<PointerType>(C->getType())->getElementType() == Ty &&
+ "Computed GetElementPtr has unexpected type!");
+
+ // If we ended up indexing a member with a type that doesn't match
+ // the type of what the original indices indexed, add a cast.
+ if (Ty != cast<PointerType>(ResultTy)->getElementType())
+ C = ConstantExpr::getBitCast(C, ResultTy);
+
+ return C;
}
/// FoldBitCast - Constant fold bitcast, symbolically evaluating it with
/// targetdata. Return 0 if unfoldable.
static Constant *FoldBitCast(Constant *C, const Type *DestTy,
- const TargetData &TD) {
+ const TargetData &TD, LLVMContext &Context) {
// If this is a bitcast from constant vector -> vector, fold it.
if (ConstantVector *CV = dyn_cast<ConstantVector>(C)) {
if (const VectorType *DestVTy = dyn_cast<VectorType>(DestTy)) {
if (DstEltTy->isFloatingPoint()) {
// Fold to an vector of integers with same size as our FP type.
unsigned FPWidth = DstEltTy->getPrimitiveSizeInBits();
- const Type *DestIVTy = VectorType::get(IntegerType::get(FPWidth),
- NumDstElt);
+ const Type *DestIVTy = VectorType::get(
+ IntegerType::get(Context, FPWidth), NumDstElt);
// Recursively handle this integer conversion, if possible.
- C = FoldBitCast(C, DestIVTy, TD);
+ C = FoldBitCast(C, DestIVTy, TD, Context);
if (!C) return 0;
// Finally, VMCore can handle this now that #elts line up.
// it to integer first.
if (SrcEltTy->isFloatingPoint()) {
unsigned FPWidth = SrcEltTy->getPrimitiveSizeInBits();
- const Type *SrcIVTy = VectorType::get(IntegerType::get(FPWidth),
- NumSrcElt);
+ const Type *SrcIVTy = VectorType::get(
+ IntegerType::get(Context, FPWidth), NumSrcElt);
// Ask VMCore to do the conversion now that #elts line up.
C = ConstantExpr::getBitCast(C, SrcIVTy);
CV = dyn_cast<ConstantVector>(C);
// Shift it to the right place, depending on endianness.
Src = ConstantExpr::getShl(Src,
- ConstantInt::get(Src->getType(), ShiftAmt));
+ ConstantInt::get(Src->getType(), ShiftAmt));
ShiftAmt += isLittleEndian ? SrcBitSize : -SrcBitSize;
// Mix it in.
// Shift the piece of the value into the right place, depending on
// endianness.
Constant *Elt = ConstantExpr::getLShr(Src,
- ConstantInt::get(Src->getType(), ShiftAmt));
+ ConstantInt::get(Src->getType(), ShiftAmt));
ShiftAmt += isLittleEndian ? DstBitSize : -DstBitSize;
// Truncate and remember this piece.
}
}
- return ConstantVector::get(&Result[0], Result.size());
+ return ConstantVector::get(Result.data(), Result.size());
}
}
/// is returned. Note that this function can only fail when attempting to fold
/// instructions like loads and stores, which have no constant expression form.
///
-Constant *llvm::ConstantFoldInstruction(Instruction *I, const TargetData *TD) {
+Constant *llvm::ConstantFoldInstruction(Instruction *I, LLVMContext &Context,
+ const TargetData *TD) {
if (PHINode *PN = dyn_cast<PHINode>(I)) {
if (PN->getNumIncomingValues() == 0)
- return Constant::getNullValue(PN->getType());
+ return UndefValue::get(PN->getType());
Constant *Result = dyn_cast<Constant>(PN->getIncomingValue(0));
if (Result == 0) return 0;
if (const CmpInst *CI = dyn_cast<CmpInst>(I))
return ConstantFoldCompareInstOperands(CI->getPredicate(),
- &Ops[0], Ops.size(), TD);
- else
- return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
- &Ops[0], Ops.size(), TD);
+ Ops.data(), Ops.size(),
+ Context, TD);
+
+ if (const LoadInst *LI = dyn_cast<LoadInst>(I))
+ return ConstantFoldLoadInst(LI, TD);
+
+ return ConstantFoldInstOperands(I->getOpcode(), I->getType(),
+ Ops.data(), Ops.size(), Context, TD);
}
/// ConstantFoldConstantExpression - Attempt to fold the constant expression
/// using the specified TargetData. If successful, the constant result is
/// result is returned, if not, null is returned.
Constant *llvm::ConstantFoldConstantExpression(ConstantExpr *CE,
+ LLVMContext &Context,
const TargetData *TD) {
- assert(TD && "ConstantFoldConstantExpression requires a valid TargetData.");
-
SmallVector<Constant*, 8> Ops;
for (User::op_iterator i = CE->op_begin(), e = CE->op_end(); i != e; ++i)
Ops.push_back(cast<Constant>(*i));
if (CE->isCompare())
return ConstantFoldCompareInstOperands(CE->getPredicate(),
- &Ops[0], Ops.size(), TD);
- else
- return ConstantFoldInstOperands(CE->getOpcode(), CE->getType(),
- &Ops[0], Ops.size(), TD);
+ Ops.data(), Ops.size(),
+ Context, TD);
+ return ConstantFoldInstOperands(CE->getOpcode(), CE->getType(),
+ Ops.data(), Ops.size(), Context, TD);
}
/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the
///
Constant *llvm::ConstantFoldInstOperands(unsigned Opcode, const Type *DestTy,
Constant* const* Ops, unsigned NumOps,
+ LLVMContext &Context,
const TargetData *TD) {
// Handle easy binops first.
if (Instruction::isBinaryOp(Opcode)) {
if (isa<ConstantExpr>(Ops[0]) || isa<ConstantExpr>(Ops[1]))
- if (Constant *C = SymbolicallyEvaluateBinop(Opcode, Ops[0], Ops[1], TD))
+ if (Constant *C = SymbolicallyEvaluateBinop(Opcode, Ops[0], Ops[1], TD,
+ Context))
return C;
return ConstantExpr::get(Opcode, Ops[0], Ops[1]);
return 0;
case Instruction::ICmp:
case Instruction::FCmp:
- case Instruction::VICmp:
- case Instruction::VFCmp:
- assert(0 &&"This function is invalid for compares: no predicate specified");
+ llvm_unreachable("This function is invalid for compares: no predicate specified");
case Instruction::PtrToInt:
// If the input is a inttoptr, eliminate the pair. This requires knowing
// the width of a pointer, so it can't be done in ConstantExpr::getCast.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) {
if (TD && CE->getOpcode() == Instruction::IntToPtr) {
Constant *Input = CE->getOperand(0);
- unsigned InWidth = Input->getType()->getPrimitiveSizeInBits();
+ unsigned InWidth = Input->getType()->getScalarSizeInBits();
if (TD->getPointerSizeInBits() < InWidth) {
Constant *Mask =
- ConstantInt::get(APInt::getLowBitsSet(InWidth,
+ ConstantInt::get(Context, APInt::getLowBitsSet(InWidth,
TD->getPointerSizeInBits()));
Input = ConstantExpr::getAnd(Input, Mask);
}
// the int size is >= the ptr size. This requires knowing the width of a
// pointer, so it can't be done in ConstantExpr::getCast.
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(Ops[0])) {
- if (TD && CE->getOpcode() == Instruction::PtrToInt &&
+ if (TD &&
TD->getPointerSizeInBits() <=
- CE->getType()->getPrimitiveSizeInBits()) {
- Constant *Input = CE->getOperand(0);
- Constant *C = FoldBitCast(Input, DestTy, *TD);
- return C ? C : ConstantExpr::getBitCast(Input, DestTy);
+ CE->getType()->getScalarSizeInBits()) {
+ if (CE->getOpcode() == Instruction::PtrToInt) {
+ Constant *Input = CE->getOperand(0);
+ Constant *C = FoldBitCast(Input, DestTy, *TD, Context);
+ return C ? C : ConstantExpr::getBitCast(Input, DestTy);
+ }
+ // If there's a constant offset added to the integer value before
+ // it is casted back to a pointer, see if the expression can be
+ // converted into a GEP.
+ if (CE->getOpcode() == Instruction::Add)
+ if (ConstantInt *L = dyn_cast<ConstantInt>(CE->getOperand(0)))
+ if (ConstantExpr *R = dyn_cast<ConstantExpr>(CE->getOperand(1)))
+ if (R->getOpcode() == Instruction::PtrToInt)
+ if (GlobalVariable *GV =
+ dyn_cast<GlobalVariable>(R->getOperand(0))) {
+ const PointerType *GVTy = cast<PointerType>(GV->getType());
+ if (const ArrayType *AT =
+ dyn_cast<ArrayType>(GVTy->getElementType())) {
+ const Type *ElTy = AT->getElementType();
+ uint64_t AllocSize = TD->getTypeAllocSize(ElTy);
+ APInt PSA(L->getValue().getBitWidth(), AllocSize);
+ if (ElTy == cast<PointerType>(DestTy)->getElementType() &&
+ L->getValue().urem(PSA) == 0) {
+ APInt ElemIdx = L->getValue().udiv(PSA);
+ if (ElemIdx.ult(APInt(ElemIdx.getBitWidth(),
+ AT->getNumElements()))) {
+ Constant *Index[] = {
+ Constant::getNullValue(CE->getType()),
+ ConstantInt::get(Context, ElemIdx)
+ };
+ return
+ ConstantExpr::getGetElementPtr(GV, &Index[0], 2);
+ }
+ }
+ }
+ }
}
}
return ConstantExpr::getCast(Opcode, Ops[0], DestTy);
return ConstantExpr::getCast(Opcode, Ops[0], DestTy);
case Instruction::BitCast:
if (TD)
- if (Constant *C = FoldBitCast(Ops[0], DestTy, *TD))
+ if (Constant *C = FoldBitCast(Ops[0], DestTy, *TD, Context))
return C;
return ConstantExpr::getBitCast(Ops[0], DestTy);
case Instruction::Select:
case Instruction::ShuffleVector:
return ConstantExpr::getShuffleVector(Ops[0], Ops[1], Ops[2]);
case Instruction::GetElementPtr:
- if (Constant *C = SymbolicallyEvaluateGEP(Ops, NumOps, DestTy, TD))
+ if (Constant *C = SymbolicallyEvaluateGEP(Ops, NumOps, DestTy, Context, TD))
return C;
return ConstantExpr::getGetElementPtr(Ops[0], Ops+1, NumOps-1);
Constant *llvm::ConstantFoldCompareInstOperands(unsigned Predicate,
Constant*const * Ops,
unsigned NumOps,
+ LLVMContext &Context,
const TargetData *TD) {
// fold: icmp (inttoptr x), null -> icmp x, 0
// fold: icmp (ptrtoint x), 0 -> icmp x, null
// around to know if bit truncation is happening.
if (ConstantExpr *CE0 = dyn_cast<ConstantExpr>(Ops[0])) {
if (TD && Ops[1]->isNullValue()) {
- const Type *IntPtrTy = TD->getIntPtrType();
+ const Type *IntPtrTy = TD->getIntPtrType(Context);
if (CE0->getOpcode() == Instruction::IntToPtr) {
// Convert the integer value to the right size to ensure we get the
// proper extension or truncation.
Constant *C = ConstantExpr::getIntegerCast(CE0->getOperand(0),
IntPtrTy, false);
Constant *NewOps[] = { C, Constant::getNullValue(C->getType()) };
- return ConstantFoldCompareInstOperands(Predicate, NewOps, 2, TD);
+ return ConstantFoldCompareInstOperands(Predicate, NewOps, 2,
+ Context, TD);
}
// Only do this transformation if the int is intptrty in size, otherwise
Constant *C = CE0->getOperand(0);
Constant *NewOps[] = { C, Constant::getNullValue(C->getType()) };
// FIXME!
- return ConstantFoldCompareInstOperands(Predicate, NewOps, 2, TD);
+ return ConstantFoldCompareInstOperands(Predicate, NewOps, 2,
+ Context, TD);
}
}
if (ConstantExpr *CE1 = dyn_cast<ConstantExpr>(Ops[1])) {
if (TD && CE0->getOpcode() == CE1->getOpcode()) {
- const Type *IntPtrTy = TD->getIntPtrType();
+ const Type *IntPtrTy = TD->getIntPtrType(Context);
if (CE0->getOpcode() == Instruction::IntToPtr) {
// Convert the integer value to the right size to ensure we get the
Constant *C1 = ConstantExpr::getIntegerCast(CE1->getOperand(0),
IntPtrTy, false);
Constant *NewOps[] = { C0, C1 };
- return ConstantFoldCompareInstOperands(Predicate, NewOps, 2, TD);
+ return ConstantFoldCompareInstOperands(Predicate, NewOps, 2,
+ Context, TD);
}
// Only do this transformation if the int is intptrty in size, otherwise
Constant *NewOps[] = {
CE0->getOperand(0), CE1->getOperand(0)
};
- return ConstantFoldCompareInstOperands(Predicate, NewOps, 2, TD);
+ return ConstantFoldCompareInstOperands(Predicate, NewOps, 2,
+ Context, TD);
}
}
}
C = UndefValue::get(ATy->getElementType());
else
return 0;
- } else if (const VectorType *PTy = dyn_cast<VectorType>(*I)) {
- if (CI->getZExtValue() >= PTy->getNumElements())
+ } else if (const VectorType *VTy = dyn_cast<VectorType>(*I)) {
+ if (CI->getZExtValue() >= VTy->getNumElements())
return 0;
if (ConstantVector *CP = dyn_cast<ConstantVector>(C))
C = CP->getOperand(CI->getZExtValue());
else if (isa<ConstantAggregateZero>(C))
- C = Constant::getNullValue(PTy->getElementType());
+ C = Constant::getNullValue(VTy->getElementType());
else if (isa<UndefValue>(C))
- C = UndefValue::get(PTy->getElementType());
+ C = UndefValue::get(VTy->getElementType());
else
return 0;
} else {
case Intrinsic::ctpop:
case Intrinsic::ctlz:
case Intrinsic::cttz:
+ case Intrinsic::uadd_with_overflow:
+ case Intrinsic::usub_with_overflow:
+ case Intrinsic::sadd_with_overflow:
+ case Intrinsic::ssub_with_overflow:
return true;
- default: break;
+ default:
+ return false;
+ case 0: break;
}
- const ValueName *NameVal = F->getValueName();
- if (NameVal == 0) return false;
- const char *Str = NameVal->getKeyData();
- unsigned Len = NameVal->getKeyLength();
+ if (!F->hasName()) return false;
+ StringRef Name = F->getName();
// In these cases, the check of the length is required. We don't want to
// return true for a name like "cos\0blah" which strcmp would return equal to
// "cos", but has length 8.
- switch (Str[0]) {
+ switch (Name[0]) {
default: return false;
case 'a':
- if (Len == 4)
- return !strcmp(Str, "acos") || !strcmp(Str, "asin") ||
- !strcmp(Str, "atan");
- else if (Len == 5)
- return !strcmp(Str, "atan2");
- return false;
+ return Name == "acos" || Name == "asin" ||
+ Name == "atan" || Name == "atan2";
case 'c':
- if (Len == 3)
- return !strcmp(Str, "cos");
- else if (Len == 4)
- return !strcmp(Str, "ceil") || !strcmp(Str, "cosf") ||
- !strcmp(Str, "cosh");
- return false;
+ return Name == "cos" || Name == "ceil" || Name == "cosf" || Name == "cosh";
case 'e':
- if (Len == 3)
- return !strcmp(Str, "exp");
- return false;
+ return Name == "exp";
case 'f':
- if (Len == 4)
- return !strcmp(Str, "fabs") || !strcmp(Str, "fmod");
- else if (Len == 5)
- return !strcmp(Str, "floor");
- return false;
- break;
+ return Name == "fabs" || Name == "fmod" || Name == "floor";
case 'l':
- if (Len == 3 && !strcmp(Str, "log"))
- return true;
- if (Len == 5 && !strcmp(Str, "log10"))
- return true;
- return false;
+ return Name == "log" || Name == "log10";
case 'p':
- if (Len == 3 && !strcmp(Str, "pow"))
- return true;
- return false;
+ return Name == "pow";
case 's':
- if (Len == 3)
- return !strcmp(Str, "sin");
- if (Len == 4)
- return !strcmp(Str, "sinh") || !strcmp(Str, "sqrt") ||
- !strcmp(Str, "sinf");
- if (Len == 5)
- return !strcmp(Str, "sqrtf");
- return false;
+ return Name == "sin" || Name == "sinh" || Name == "sqrt" ||
+ Name == "sinf" || Name == "sqrtf";
case 't':
- if (Len == 3 && !strcmp(Str, "tan"))
- return true;
- else if (Len == 4 && !strcmp(Str, "tanh"))
- return true;
- return false;
+ return Name == "tan" || Name == "tanh";
}
}
static Constant *ConstantFoldFP(double (*NativeFP)(double), double V,
- const Type *Ty) {
+ const Type *Ty, LLVMContext &Context) {
errno = 0;
V = NativeFP(V);
if (errno != 0) {
return 0;
}
- if (Ty == Type::FloatTy)
- return ConstantFP::get(APFloat((float)V));
- if (Ty == Type::DoubleTy)
- return ConstantFP::get(APFloat(V));
- assert(0 && "Can only constant fold float/double");
+ if (Ty->isFloatTy())
+ return ConstantFP::get(Context, APFloat((float)V));
+ if (Ty->isDoubleTy())
+ return ConstantFP::get(Context, APFloat(V));
+ llvm_unreachable("Can only constant fold float/double");
return 0; // dummy return to suppress warning
}
static Constant *ConstantFoldBinaryFP(double (*NativeFP)(double, double),
double V, double W,
- const Type *Ty) {
+ const Type *Ty,
+ LLVMContext &Context) {
errno = 0;
V = NativeFP(V, W);
if (errno != 0) {
return 0;
}
- if (Ty == Type::FloatTy)
- return ConstantFP::get(APFloat((float)V));
- if (Ty == Type::DoubleTy)
- return ConstantFP::get(APFloat(V));
- assert(0 && "Can only constant fold float/double");
+ if (Ty->isFloatTy())
+ return ConstantFP::get(Context, APFloat((float)V));
+ if (Ty->isDoubleTy())
+ return ConstantFP::get(Context, APFloat(V));
+ llvm_unreachable("Can only constant fold float/double");
return 0; // dummy return to suppress warning
}
/// ConstantFoldCall - Attempt to constant fold a call to the specified function
/// with the specified arguments, returning null if unsuccessful.
-
Constant *
llvm::ConstantFoldCall(Function *F,
- Constant* const* Operands, unsigned NumOperands) {
- const ValueName *NameVal = F->getValueName();
- if (NameVal == 0) return 0;
- const char *Str = NameVal->getKeyData();
- unsigned Len = NameVal->getKeyLength();
-
+ Constant *const *Operands, unsigned NumOperands) {
+ if (!F->hasName()) return 0;
+ LLVMContext &Context = F->getContext();
+ StringRef Name = F->getName();
+
const Type *Ty = F->getReturnType();
if (NumOperands == 1) {
if (ConstantFP *Op = dyn_cast<ConstantFP>(Operands[0])) {
- if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+ if (!Ty->isFloatTy() && !Ty->isDoubleTy())
return 0;
/// Currently APFloat versions of these functions do not exist, so we use
/// the host native double versions. Float versions are not called
/// directly but for all these it is true (float)(f((double)arg)) ==
/// f(arg). Long double not supported yet.
- double V = Ty==Type::FloatTy ? (double)Op->getValueAPF().convertToFloat():
+ double V = Ty->isFloatTy() ? (double)Op->getValueAPF().convertToFloat() :
Op->getValueAPF().convertToDouble();
- switch (Str[0]) {
+ switch (Name[0]) {
case 'a':
- if (Len == 4 && !strcmp(Str, "acos"))
- return ConstantFoldFP(acos, V, Ty);
- else if (Len == 4 && !strcmp(Str, "asin"))
- return ConstantFoldFP(asin, V, Ty);
- else if (Len == 4 && !strcmp(Str, "atan"))
- return ConstantFoldFP(atan, V, Ty);
+ if (Name == "acos")
+ return ConstantFoldFP(acos, V, Ty, Context);
+ else if (Name == "asin")
+ return ConstantFoldFP(asin, V, Ty, Context);
+ else if (Name == "atan")
+ return ConstantFoldFP(atan, V, Ty, Context);
break;
case 'c':
- if (Len == 4 && !strcmp(Str, "ceil"))
- return ConstantFoldFP(ceil, V, Ty);
- else if (Len == 3 && !strcmp(Str, "cos"))
- return ConstantFoldFP(cos, V, Ty);
- else if (Len == 4 && !strcmp(Str, "cosh"))
- return ConstantFoldFP(cosh, V, Ty);
- else if (Len == 4 && !strcmp(Str, "cosf"))
- return ConstantFoldFP(cos, V, Ty);
+ if (Name == "ceil")
+ return ConstantFoldFP(ceil, V, Ty, Context);
+ else if (Name == "cos")
+ return ConstantFoldFP(cos, V, Ty, Context);
+ else if (Name == "cosh")
+ return ConstantFoldFP(cosh, V, Ty, Context);
+ else if (Name == "cosf")
+ return ConstantFoldFP(cos, V, Ty, Context);
break;
case 'e':
- if (Len == 3 && !strcmp(Str, "exp"))
- return ConstantFoldFP(exp, V, Ty);
+ if (Name == "exp")
+ return ConstantFoldFP(exp, V, Ty, Context);
break;
case 'f':
- if (Len == 4 && !strcmp(Str, "fabs"))
- return ConstantFoldFP(fabs, V, Ty);
- else if (Len == 5 && !strcmp(Str, "floor"))
- return ConstantFoldFP(floor, V, Ty);
+ if (Name == "fabs")
+ return ConstantFoldFP(fabs, V, Ty, Context);
+ else if (Name == "floor")
+ return ConstantFoldFP(floor, V, Ty, Context);
break;
case 'l':
- if (Len == 3 && !strcmp(Str, "log") && V > 0)
- return ConstantFoldFP(log, V, Ty);
- else if (Len == 5 && !strcmp(Str, "log10") && V > 0)
- return ConstantFoldFP(log10, V, Ty);
- else if (!strcmp(Str, "llvm.sqrt.f32") ||
- !strcmp(Str, "llvm.sqrt.f64")) {
+ if (Name == "log" && V > 0)
+ return ConstantFoldFP(log, V, Ty, Context);
+ else if (Name == "log10" && V > 0)
+ return ConstantFoldFP(log10, V, Ty, Context);
+ else if (Name == "llvm.sqrt.f32" ||
+ Name == "llvm.sqrt.f64") {
if (V >= -0.0)
- return ConstantFoldFP(sqrt, V, Ty);
+ return ConstantFoldFP(sqrt, V, Ty, Context);
else // Undefined
return Constant::getNullValue(Ty);
}
break;
case 's':
- if (Len == 3 && !strcmp(Str, "sin"))
- return ConstantFoldFP(sin, V, Ty);
- else if (Len == 4 && !strcmp(Str, "sinh"))
- return ConstantFoldFP(sinh, V, Ty);
- else if (Len == 4 && !strcmp(Str, "sqrt") && V >= 0)
- return ConstantFoldFP(sqrt, V, Ty);
- else if (Len == 5 && !strcmp(Str, "sqrtf") && V >= 0)
- return ConstantFoldFP(sqrt, V, Ty);
- else if (Len == 4 && !strcmp(Str, "sinf"))
- return ConstantFoldFP(sin, V, Ty);
+ if (Name == "sin")
+ return ConstantFoldFP(sin, V, Ty, Context);
+ else if (Name == "sinh")
+ return ConstantFoldFP(sinh, V, Ty, Context);
+ else if (Name == "sqrt" && V >= 0)
+ return ConstantFoldFP(sqrt, V, Ty, Context);
+ else if (Name == "sqrtf" && V >= 0)
+ return ConstantFoldFP(sqrt, V, Ty, Context);
+ else if (Name == "sinf")
+ return ConstantFoldFP(sin, V, Ty, Context);
break;
case 't':
- if (Len == 3 && !strcmp(Str, "tan"))
- return ConstantFoldFP(tan, V, Ty);
- else if (Len == 4 && !strcmp(Str, "tanh"))
- return ConstantFoldFP(tanh, V, Ty);
+ if (Name == "tan")
+ return ConstantFoldFP(tan, V, Ty, Context);
+ else if (Name == "tanh")
+ return ConstantFoldFP(tanh, V, Ty, Context);
break;
default:
break;
}
- } else if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) {
- if (Len > 11 && !memcmp(Str, "llvm.bswap", 10))
- return ConstantInt::get(Op->getValue().byteSwap());
- else if (Len > 11 && !memcmp(Str, "llvm.ctpop", 10))
+ return 0;
+ }
+
+
+ if (ConstantInt *Op = dyn_cast<ConstantInt>(Operands[0])) {
+ if (Name.startswith("llvm.bswap"))
+ return ConstantInt::get(Context, Op->getValue().byteSwap());
+ else if (Name.startswith("llvm.ctpop"))
return ConstantInt::get(Ty, Op->getValue().countPopulation());
- else if (Len > 10 && !memcmp(Str, "llvm.cttz", 9))
+ else if (Name.startswith("llvm.cttz"))
return ConstantInt::get(Ty, Op->getValue().countTrailingZeros());
- else if (Len > 10 && !memcmp(Str, "llvm.ctlz", 9))
+ else if (Name.startswith("llvm.ctlz"))
return ConstantInt::get(Ty, Op->getValue().countLeadingZeros());
+ return 0;
}
- } else if (NumOperands == 2) {
+
+ return 0;
+ }
+
+ if (NumOperands == 2) {
if (ConstantFP *Op1 = dyn_cast<ConstantFP>(Operands[0])) {
- if (Ty!=Type::FloatTy && Ty!=Type::DoubleTy)
+ if (!Ty->isFloatTy() && !Ty->isDoubleTy())
return 0;
- double Op1V = Ty==Type::FloatTy ?
- (double)Op1->getValueAPF().convertToFloat():
+ double Op1V = Ty->isFloatTy() ?
+ (double)Op1->getValueAPF().convertToFloat() :
Op1->getValueAPF().convertToDouble();
if (ConstantFP *Op2 = dyn_cast<ConstantFP>(Operands[1])) {
- double Op2V = Ty==Type::FloatTy ?
+ if (Op2->getType() != Op1->getType())
+ return 0;
+
+ double Op2V = Ty->isFloatTy() ?
(double)Op2->getValueAPF().convertToFloat():
Op2->getValueAPF().convertToDouble();
- if (Len == 3 && !strcmp(Str, "pow")) {
- return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty);
- } else if (Len == 4 && !strcmp(Str, "fmod")) {
- return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty);
- } else if (Len == 5 && !strcmp(Str, "atan2")) {
- return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty);
- }
+ if (Name == "pow")
+ return ConstantFoldBinaryFP(pow, Op1V, Op2V, Ty, Context);
+ if (Name == "fmod")
+ return ConstantFoldBinaryFP(fmod, Op1V, Op2V, Ty, Context);
+ if (Name == "atan2")
+ return ConstantFoldBinaryFP(atan2, Op1V, Op2V, Ty, Context);
} else if (ConstantInt *Op2C = dyn_cast<ConstantInt>(Operands[1])) {
- if (!strcmp(Str, "llvm.powi.f32")) {
- return ConstantFP::get(APFloat((float)std::pow((float)Op1V,
+ if (Name == "llvm.powi.f32")
+ return ConstantFP::get(Context, APFloat((float)std::pow((float)Op1V,
(int)Op2C->getZExtValue())));
- } else if (!strcmp(Str, "llvm.powi.f64")) {
- return ConstantFP::get(APFloat((double)std::pow((double)Op1V,
+ if (Name == "llvm.powi.f64")
+ return ConstantFP::get(Context, APFloat((double)std::pow((double)Op1V,
(int)Op2C->getZExtValue())));
+ }
+ return 0;
+ }
+
+
+ if (ConstantInt *Op1 = dyn_cast<ConstantInt>(Operands[0])) {
+ if (ConstantInt *Op2 = dyn_cast<ConstantInt>(Operands[1])) {
+ switch (F->getIntrinsicID()) {
+ default: break;
+ case Intrinsic::uadd_with_overflow: {
+ Constant *Res = ConstantExpr::getAdd(Op1, Op2); // result.
+ Constant *Ops[] = {
+ Res, ConstantExpr::getICmp(CmpInst::ICMP_ULT, Res, Op1) // overflow.
+ };
+ return ConstantStruct::get(F->getContext(), Ops, 2, false);
+ }
+ case Intrinsic::usub_with_overflow: {
+ Constant *Res = ConstantExpr::getSub(Op1, Op2); // result.
+ Constant *Ops[] = {
+ Res, ConstantExpr::getICmp(CmpInst::ICMP_UGT, Res, Op1) // overflow.
+ };
+ return ConstantStruct::get(F->getContext(), Ops, 2, false);
+ }
+ case Intrinsic::sadd_with_overflow: {
+ Constant *Res = ConstantExpr::getAdd(Op1, Op2); // result.
+ Constant *Overflow = ConstantExpr::getSelect(
+ ConstantExpr::getICmp(CmpInst::ICMP_SGT,
+ ConstantInt::get(Op1->getType(), 0), Op1),
+ ConstantExpr::getICmp(CmpInst::ICMP_SGT, Res, Op2),
+ ConstantExpr::getICmp(CmpInst::ICMP_SLT, Res, Op2)); // overflow.
+
+ Constant *Ops[] = { Res, Overflow };
+ return ConstantStruct::get(F->getContext(), Ops, 2, false);
+ }
+ case Intrinsic::ssub_with_overflow: {
+ Constant *Res = ConstantExpr::getSub(Op1, Op2); // result.
+ Constant *Overflow = ConstantExpr::getSelect(
+ ConstantExpr::getICmp(CmpInst::ICMP_SGT,
+ ConstantInt::get(Op2->getType(), 0), Op2),
+ ConstantExpr::getICmp(CmpInst::ICMP_SLT, Res, Op1),
+ ConstantExpr::getICmp(CmpInst::ICMP_SGT, Res, Op1)); // overflow.
+
+ Constant *Ops[] = { Res, Overflow };
+ return ConstantStruct::get(F->getContext(), Ops, 2, false);
+ }
}
}
+
+ return 0;
}
+ return 0;
}
return 0;
}
projects / oota-llvm.git / blobdiff