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Filter nested structs

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llvm-svn: 47906
This commit is contained in:
Devang Patel 2008-03-04 21:32:09 +00:00
parent a14b91d6a3
commit 219be17d65
1 changed files with 16 additions and 0 deletions
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16
lib/Transforms/IPO/StructRetPromotion.cpp
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@ -48,6 +48,7 @@ namespace {
bool isSafeToUpdateAllCallers(Function *F);
Function *cloneFunctionBody(Function *F, const StructType *STy);
void updateCallSites(Function *F, Function *NF);
bool nestedStructType(const StructType *STy);
};
char SRETPromotion::ID = 0;
@ -88,6 +89,9 @@ bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
dyn_cast<StructType>(FArgType->getElementType());
assert (STy && "Invalid sret parameter element type");
if (nestedStructType(STy))
return false;
// Check if it is ok to perform this promotion.
if (isSafeToUpdateAllCallers(F) == false) {
NumRejectedSRETUses++;
@ -319,3 +323,15 @@ void SRETPromotion::updateCallSites(Function *F, Function *NF) {
Call->eraseFromParent();
}
}
/// nestedStructType - Return true if STy includes any
/// other aggregate types
bool SRETPromotion::nestedStructType(const StructType *STy) {
unsigned Num = STy->getNumElements();
for (unsigned i = 0; i < Num; i++) {
const Type *Ty = STy->getElementType(i);
if (!Ty->isFirstClassType() && Ty != Type::VoidTy)
return true;
}
return false;
}