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Fix another constant folding address space place I missed.

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This fixes an assertion failure with a different sized address space.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194014 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2013-11-04 20:46:52 +00:00
parent eba6d38448
commit 896a885f21
2 changed files with 38 additions and 13 deletions
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31
lib/Analysis/ConstantFolding.cpp
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@ -224,7 +224,8 @@ static bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV,
APInt &Offset, const DataLayout &TD) {
// Trivial case, constant is the global.
if ((GV = dyn_cast<GlobalValue>(C))) {
Offset.clearAllBits();
unsigned BitWidth = TD.getPointerTypeSizeInBits(GV->getType());
Offset = APInt(BitWidth, 0);
return true;
}
@ -238,16 +239,23 @@ static bool IsConstantOffsetFromGlobal(Constant *C, GlobalValue *&GV,
return IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD);
// i32* getelementptr ([5 x i32]* @a, i32 0, i32 5)
if (GEPOperator *GEP = dyn_cast<GEPOperator>(CE)) {
// If the base isn't a global+constant, we aren't either.
if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, Offset, TD))
return false;
GEPOperator *GEP = dyn_cast<GEPOperator>(CE);
if (!GEP)
return false;
// Otherwise, add any offset that our operands provide.
return GEP->accumulateConstantOffset(TD, Offset);
}
unsigned BitWidth = TD.getPointerTypeSizeInBits(GEP->getType());
APInt TmpOffset(BitWidth, 0);
return false;
// If the base isn't a global+constant, we aren't either.
if (!IsConstantOffsetFromGlobal(CE->getOperand(0), GV, TmpOffset, TD))
return false;
// Otherwise, add any offset that our operands provide.
if (!GEP->accumulateConstantOffset(TD, TmpOffset))
return false;
Offset = TmpOffset;
return true;
}
/// ReadDataFromGlobal - Recursive helper to read bits out of global. C is the
@ -416,7 +424,7 @@ static Constant *FoldReinterpretLoadFromConstPtr(Constant *C,
return 0;
GlobalValue *GVal;
APInt Offset(TD.getPointerTypeSizeInBits(PTy), 0);
APInt Offset;
if (!IsConstantOffsetFromGlobal(C, GVal, Offset, TD))
return 0;
@ -585,8 +593,7 @@ static Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0,
// constant. This happens frequently when iterating over a global array.
if (Opc == Instruction::Sub && DL) {
GlobalValue *GV1, *GV2;
unsigned PtrSize = DL->getPointerSizeInBits();
APInt Offs1(PtrSize, 0), Offs2(PtrSize, 0);
APInt Offs1, Offs2;
if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *DL))
if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *DL) &&