In theory the aliasee may have dead constant users

here.  Since we only do the transform if there is
one use, strip off any such users in the hope of
making the transform fire more often.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64926 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/IPO/GlobalOpt.cpp b/lib/Transforms/IPO/GlobalOpt.cpp
index 0ac1e65..0a35fa9 100644 (file)
--- a/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2383,6 +2383,7 @@ bool GlobalOpt::ResolveAliases(Module &M) {
 
     Constant *Aliasee = J->getAliasee();
     GlobalValue *Target = cast<GlobalValue>(Aliasee->stripPointerCasts());
+    Target->removeDeadConstantUsers();
     bool hasOneUse = Target->hasOneUse() && Aliasee->hasOneUse();
 
     // Make all users of the alias use the aliasee instead.