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Move variable under condition where it is used

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@190567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault 2013-09-12 01:07:58 +00:00
parent b95237f10c
commit 180df81c8f
1 changed files with 2 additions and 1 deletions
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3
lib/Analysis/ConstantFolding.cpp
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@ -586,12 +586,13 @@ static Constant *SymbolicallyEvaluateBinop(unsigned Opc, Constant *Op0,
if (Opc == Instruction::Sub && DL) {
GlobalValue *GV1, *GV2;
unsigned PtrSize = DL->getPointerSizeInBits();
unsigned OpSize = DL->getTypeSizeInBits(Op0->getType());
APInt Offs1(PtrSize, 0), Offs2(PtrSize, 0);
if (IsConstantOffsetFromGlobal(Op0, GV1, Offs1, *DL))
if (IsConstantOffsetFromGlobal(Op1, GV2, Offs2, *DL) &&
GV1 == GV2) {
unsigned OpSize = DL->getTypeSizeInBits(Op0->getType());
// (&GV+C1) - (&GV+C2) -> C1-C2, pointer arithmetic cannot overflow.
// PtrToInt may change the bitwidth so we have convert to the right size
// first.