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authorChris Lattner <sabre@nondot.org>2008-06-09 07:58:07 +0000
committerChris Lattner <sabre@nondot.org>2008-06-09 07:58:07 +0000
commita77a73efa3773167893a676484ca6af50fd8ae7f (patch)
tree11bf9dfa8d76033f80ca964d827c5aa7df09b5be /lib
parentbbce2e4a5090e2f888896a8e44d0db633aa894cf (diff)
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Fix PR2411, where ip constant prop would propagate the
result of a weak function. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@52137 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib')
-rw-r--r--lib/Transforms/IPO/IPConstantPropagation.cpp5
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/IPO/IPConstantPropagation.cpp b/lib/Transforms/IPO/IPConstantPropagation.cpp
index 792fa98..4ebdaf3 100644
--- a/lib/Transforms/IPO/IPConstantPropagation.cpp
+++ b/lib/Transforms/IPO/IPConstantPropagation.cpp
@@ -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());