Given two identical weak functions, produce one internal function and two weak
thunks.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@73230 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/IPO/MergeFunctions.cpp b/lib/Transforms/IPO/MergeFunctions.cpp
index 16083ec..e237fcd 100644
--- a/lib/Transforms/IPO/MergeFunctions.cpp
+++ b/lib/Transforms/IPO/MergeFunctions.cpp
@@ -458,8 +458,8 @@
}
static void ThunkGToF(Function *F, Function *G) {
- Function *NewG = Function::Create(G->getFunctionType(), G->getLinkage(),
- "", G->getParent());
+ Function *NewG = Function::Create(G->getFunctionType(), G->getLinkage(), "",
+ G->getParent());
BasicBlock *BB = BasicBlock::Create("", NewG);
std::vector<Value *> Args;
@@ -539,8 +539,21 @@
}
break;
- case ExternalWeak:
- return false;
+ case ExternalWeak: {
+ assert(catG == ExternalWeak);
+
+ // Make them both thunks to the same internal function.
+ F->setAlignment(std::max(F->getAlignment(), G->getAlignment()));
+ Function *H = Function::Create(F->getFunctionType(), F->getLinkage(), "",
+ F->getParent());
+ H->copyAttributesFrom(F);
+ H->takeName(F);
+
+ ThunkGToF(F, G);
+ ThunkGToF(F, H);
+
+ F->setLinkage(GlobalValue::InternalLinkage);
+ } break;
case Internal:
switch (catG) {