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convert a bunch of callers from DataLayout::getIndexedOffset() to GEP::accumulateConstantOffset().

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The later API is nicer than the former, and is correct regarding wrap-around offsets (if anyone cares).
There are a few more places left with duplicated code, which I'll remove soon.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171259 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nuno Lopes
2012-12-30 16:25:48 +00:00
parent 0d80c9c8c7
commit 98281a2050
8 changed files with 30 additions and 83 deletions
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8
lib/Transforms/InstCombine/InstCombineCasts.cpp
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@@ -1337,17 +1337,15 @@ Instruction *InstCombiner::commonPointerCastTransforms(CastInst &CI) {
// GEP computes a constant offset, see if we can convert these three
// instructions into fewer. This typically happens with unions and other
// non-type-safe code.
APInt Offset(TD ? TD->getPointerSizeInBits() : 1, 0);
if (TD && GEP->hasOneUse() && isa<BitCastInst>(GEP->getOperand(0)) &&
GEP->hasAllConstantIndices()) {
SmallVector<Value*, 8> Ops(GEP->idx_begin(), GEP->idx_end());
int64_t Offset = TD->getIndexedOffset(GEP->getPointerOperandType(), Ops);
GEP->accumulateConstantOffset(*TD, Offset)) {
// Get the base pointer input of the bitcast, and the type it points to.
Value *OrigBase = cast<BitCastInst>(GEP->getOperand(0))->getOperand(0);
Type *GEPIdxTy =
cast<PointerType>(OrigBase->getType())->getElementType();
SmallVector<Value*, 8> NewIndices;
if (FindElementAtOffset(GEPIdxTy, Offset, NewIndices)) {
if (FindElementAtOffset(GEPIdxTy, Offset.getSExtValue(), NewIndices)) {
// If we were able to index down into an element, create the GEP
// and bitcast the result. This eliminates one bitcast, potentially
// two.