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Filter nested structs

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47906 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Devang Patel
2008-03-04 21:32:09 +00:00
parent dc00d42bb1
commit a9fe8bb3b6
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); bool isSafeToUpdateAllCallers(Function *F);
Function *cloneFunctionBody(Function *F, const StructType *STy); Function *cloneFunctionBody(Function *F, const StructType *STy);
void updateCallSites(Function *F, Function *NF); void updateCallSites(Function *F, Function *NF);
bool nestedStructType(const StructType *STy);
}; };
char SRETPromotion::ID = 0; char SRETPromotion::ID = 0;
@@ -88,6 +89,9 @@ bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
dyn_cast<StructType>(FArgType->getElementType()); dyn_cast<StructType>(FArgType->getElementType());
assert (STy && "Invalid sret parameter element type"); assert (STy && "Invalid sret parameter element type");
if (nestedStructType(STy))
return false;
// Check if it is ok to perform this promotion. // Check if it is ok to perform this promotion.
if (isSafeToUpdateAllCallers(F) == false) { if (isSafeToUpdateAllCallers(F) == false) {
NumRejectedSRETUses++; NumRejectedSRETUses++;
@@ -319,3 +323,15 @@ void SRETPromotion::updateCallSites(Function *F, Function *NF) {
Call->eraseFromParent(); 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;
}