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[IPO/MergeFunctions] changes so it doesn't try to bitcast a struct return type but instead recreates it with insert/extract value.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@207679 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Carlo Kok
2014-04-30 17:53:04 +00:00
parent bf741d2bdd
commit 78ecea93a3
2 changed files with 56 additions and 1 deletions
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17
lib/Transforms/IPO/MergeFunctions.cpp
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@ -784,8 +784,23 @@ void MergeFunctions::writeThunkOrAlias(Function *F, Function *G) {
// Helper for writeThunk,
// Selects proper bitcast operation,
// but a bit simpler then CastInst::getCastOpcode.
static Value* createCast(IRBuilder<false> &Builder, Value *V, Type *DestTy) {
static Value *createCast(IRBuilder<false> &Builder, Value *V, Type *DestTy) {
Type *SrcTy = V->getType();
if (SrcTy->isStructTy()) {
assert(DestTy->isStructTy());
assert(SrcTy->getStructNumElements() == DestTy->getStructNumElements());
Value *Result = UndefValue::get(DestTy);
for (unsigned int I = 0, E = SrcTy->getStructNumElements(); I < E; ++I) {
Value *Element = createCast(
Builder, Builder.CreateExtractValue(V, ArrayRef<unsigned int>(I)),
DestTy->getStructElementType(I));
Result =
Builder.CreateInsertValue(Result, Element, ArrayRef<unsigned int>(I));
}
return Result;
}
assert(!DestTy->isStructTy());
if (SrcTy->isIntegerTy() && DestTy->isPointerTy())
return Builder.CreateIntToPtr(V, DestTy);
else if (SrcTy->isPointerTy() && DestTy->isIntegerTy())