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Constant propagating byval pointer is safe if function is readonly.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@82700 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -131,7 +131,7 @@ bool IPCP::PropagateConstantsIntoArguments(Function &F) {
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for (unsigned i = 0, e = ArgumentConstants.size(); i != e; ++i, ++AI) {
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// Do we have a constant argument?
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if (ArgumentConstants[i].second || AI->use_empty() ||
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(AI->hasByValAttr() && isa<PointerType>(AI->getType())))
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(AI->hasByValAttr() && !F.onlyReadsMemory()))
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continue;
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Value *V = ArgumentConstants[i].first;
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@ -1267,7 +1267,7 @@ CallOverdefined:
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for (Function::arg_iterator AI = F->arg_begin(), E = F->arg_end();
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AI != E; ++AI, ++CAI) {
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LatticeVal &IV = ValueState[AI];
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if (AI->hasByValAttr() && isa<PointerType>(AI->getType())) {
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if (AI->hasByValAttr() && !F->onlyReadsMemory()) {
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IV.markOverdefined();
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continue;
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}
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@ -16,9 +16,25 @@ entry:
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return: ; preds = %entry
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ret void
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}
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define void @unions() nounwind {
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define internal i32 @vfu2(%struct.MYstr* byval align 4 %u) nounwind readonly {
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entry:
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call void @vfu1(%struct.MYstr* byval align 4 @mystr) nounwind
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ret void
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%0 = getelementptr %struct.MYstr* %u, i32 0, i32 1 ; <i32*> [#uses=1]
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%1 = load i32* %0
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; CHECK: load i32* getelementptr inbounds (%struct.MYstr* @mystr, i32 0, i32 1) ; <i32> [#uses=1]
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%2 = getelementptr %struct.MYstr* %u, i32 0, i32 0 ; <i8*> [#uses=1]
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%3 = load i8* %2
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; CHECK: load i8* getelementptr inbounds (%struct.MYstr* @mystr, i32 0, i32 0) ; <i8> [#uses=1]
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%4 = zext i8 %3 to i32
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%5 = add i32 %4, %1
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ret i32 %5
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}
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define i32 @unions() nounwind {
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entry:
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call void @vfu1(%struct.MYstr* byval align 4 @mystr) nounwind
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%result = call i32 @vfu2(%struct.MYstr* byval align 4 @mystr) nounwind
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ret i32 %result
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}
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