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Don't let DeadArgElimination change the return type ({} into void and {T}

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into T) when no return values are actually dead.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52537 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthijs Kooijman 2008-06-20 15:16:45 +00:00
parent 9cb6ec26b3
commit 03d18569cb
1 changed files with 13 additions and 7 deletions
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20
lib/Transforms/IPO/DeadArgumentElimination.cpp
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@ -598,15 +598,21 @@ bool DAE::RemoveDeadStuffFromFunction(Function *F) {
++NumRetValsEliminated;
Changed = true;
}
if (RetTypes.size() == 0)
// No return types? Make it void
NRetTy = Type::VoidTy;
if (RetTypes.size() > 1 || (STy && STy->getNumElements() == RetTypes.size()))
// More than one return type? Return a struct with them. Also, if we used
// to return a struct and didn't change the number of return values,
// return a struct again. This prevents chaning {something} into something
// and {} into void.
// Make the new struct packed if we used to return a packed struct
// already.
NRetTy = StructType::get(RetTypes, STy->isPacked());
else if (RetTypes.size() == 1)
// One return type? Just a simple value then
// One return type? Just a simple value then, but only if we didn't use to
// return a struct with that simple value before.
NRetTy = RetTypes.front();
else
// More return types? Return a struct with them
NRetTy = StructType::get(RetTypes);
else if (RetTypes.size() == 0)
// No return types? Make it void, but only if we didn't use to return {}
NRetTy = Type::VoidTy;
} else {
NRetTy = Type::VoidTy;
}