Enhance LICM to promote alias sets whose pointers themselves are stored,
which doesn't affect the memory address being promoted.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122172 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp
index 46fffcc..6d5b24a 100644
--- a/lib/Transforms/Scalar/LICM.cpp
+++ b/lib/Transforms/Scalar/LICM.cpp
@@ -691,7 +691,10 @@
if (isa<LoadInst>(Use))
assert(!cast<LoadInst>(Use)->isVolatile() && "AST broken");
else if (isa<StoreInst>(Use)) {
- if (Use->getOperand(0) == ASIV) return;
+ // Stores *of* the pointer are not interesting, only stores *to* the
+ // pointer.
+ if (Use->getOperand(1) != ASIV)
+ continue;
assert(!cast<StoreInst>(Use)->isVolatile() && "AST broken");
} else
return; // Not a load or store.