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objectsize: add support for GEPs with non-constant indexes

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add an additional parameter to InstCombiner::EmitGEPOffset() to force it to *not* emit operations with NUW flag

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@156585 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-05-10 23:17:35 +00:00
parent deaa3f3e52
commit 9d236f909c
4 changed files with 59 additions and 34 deletions
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5
lib/Transforms/InstCombine/InstCombineAddSub.cpp
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@ -423,7 +423,8 @@ Instruction *InstCombiner::visitFAdd(BinaryOperator &I) {
/// EmitGEPOffset - Given a getelementptr instruction/constantexpr, emit the
/// code necessary to compute the offset from the base pointer (without adding
/// in the base pointer). Return the result as a signed integer of intptr size.
Value *InstCombiner::EmitGEPOffset(User *GEP) {
/// If NoNUW is true, then the NUW flag is not used.
Value *InstCombiner::EmitGEPOffset(User *GEP, bool NoNUW) {
TargetData &TD = *getTargetData();
gep_type_iterator GTI = gep_type_begin(GEP);
Type *IntPtrTy = TD.getIntPtrType(GEP->getContext());
@ -431,7 +432,7 @@ Value *InstCombiner::EmitGEPOffset(User *GEP) {
// If the GEP is inbounds, we know that none of the addressing operations will
// overflow in an unsigned sense.
bool isInBounds = cast<GEPOperator>(GEP)->isInBounds();
bool isInBounds = cast<GEPOperator>(GEP)->isInBounds() && !NoNUW;
// Build a mask for high order bits.
unsigned IntPtrWidth = TD.getPointerSizeInBits();