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Fix PR2411, where ip constant prop would propagate the

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result of a weak function.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52137 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-06-09 07:58:07 +00:00
parent 93ee81e5b9
commit 18d73c206e
2 changed files with 20 additions and 0 deletions
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5
lib/Transforms/IPO/IPConstantPropagation.cpp
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@ -147,6 +147,11 @@ bool IPCP::PropagateConstantReturn(Function &F) {
if (F.getReturnType() == Type::VoidTy)
return false; // No return value.
// If this function could be overridden later in the link stage, we can't
// propagate information about its results into callers.
if (F.hasLinkOnceLinkage() || F.hasWeakLinkage())
return false;
// Check to see if this function returns a constant.
SmallVector<Value *,4> RetVals;
const StructType *STy = dyn_cast<StructType>(F.getReturnType());

15
test/Transforms/IPConstantProp/2008-06-09-WeakProp.ll Normal file
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@ -0,0 +1,15 @@
; RUN: llvm-as < %s | opt -ipconstprop | llvm-dis | grep {ret i32 %r}
; Should not propagate the result of a weak function.
; PR2411
define weak i32 @foo() nounwind {
entry:
ret i32 1
}
define i32 @main() nounwind {
entry:
%r = call i32 @foo( ) nounwind
ret i32 %r
}