fix PR9841 by having GVN not process dead loads. This was
causing it to get into infinite loops when it would widen a
load (which can necessarily leave around dead loads).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@131847 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Scalar/GVN.cpp b/lib/Transforms/Scalar/GVN.cpp
index 1da5238..2515fd1 100644
--- a/lib/Transforms/Scalar/GVN.cpp
+++ b/lib/Transforms/Scalar/GVN.cpp
@@ -1607,6 +1607,11 @@
if (L->isVolatile())
return false;
+ if (L->use_empty()) {
+ markInstructionForDeletion(L);
+ return true;
+ }
+
// ... to a pointer that has been loaded from before...
MemDepResult Dep = MD->getDependency(L);