replace usage of EmitGEPOffset() with TargetData::getIndexedOffset() when the GEP offset is known to be constant.

With this change, we avoid relying on the IR Builder to constant fold the operations.

No functionality change intended.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158829 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-06-20 17:30:51 +00:00
parent 2769e93384
commit b47f3ea224
2 changed files with 6 additions and 8 deletions

View File

@ -1058,10 +1058,9 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
!isa<BitCastInst>(BCI->getOperand(0)) && GEP.hasAllConstantIndices() &&
StrippedPtrTy->getAddressSpace() == GEP.getPointerAddressSpace()) {
// Determine how much the GEP moves the pointer. We are guaranteed to get
// a constant back from EmitGEPOffset.
ConstantInt *OffsetV = cast<ConstantInt>(EmitGEPOffset(&GEP));
int64_t Offset = OffsetV->getSExtValue();
// Determine how much the GEP moves the pointer.
SmallVector<Value*, 8> Ops(GEP.idx_begin(), GEP.idx_end());
int64_t Offset = TD->getIndexedOffset(GEP.getPointerOperandType(), Ops);
// If this GEP instruction doesn't move the pointer, just replace the GEP
// with a bitcast of the real input to the dest type.