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Filter nested structs
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47906 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -48,6 +48,7 @@ namespace {
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bool isSafeToUpdateAllCallers(Function *F);
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Function *cloneFunctionBody(Function *F, const StructType *STy);
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void updateCallSites(Function *F, Function *NF);
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bool nestedStructType(const StructType *STy);
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};
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char SRETPromotion::ID = 0;
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@ -88,6 +89,9 @@ bool SRETPromotion::PromoteReturn(CallGraphNode *CGN) {
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dyn_cast<StructType>(FArgType->getElementType());
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assert (STy && "Invalid sret parameter element type");
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if (nestedStructType(STy))
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return false;
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// Check if it is ok to perform this promotion.
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if (isSafeToUpdateAllCallers(F) == false) {
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NumRejectedSRETUses++;
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@ -319,3 +323,15 @@ void SRETPromotion::updateCallSites(Function *F, Function *NF) {
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Call->eraseFromParent();
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}
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}
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/// nestedStructType - Return true if STy includes any
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/// other aggregate types
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bool SRETPromotion::nestedStructType(const StructType *STy) {
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unsigned Num = STy->getNumElements();
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for (unsigned i = 0; i < Num; i++) {
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const Type *Ty = STy->getElementType(i);
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if (!Ty->isFirstClassType() && Ty != Type::VoidTy)
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return true;
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}
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return false;
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}
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