Fix PR2346 by marking vaarg as volatile so that licm doesn't try to
hoist them.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51356 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/AliasSetTracker.cpp b/lib/Analysis/AliasSetTracker.cpp
index 68603e5..228bb80 100644
--- a/lib/Analysis/AliasSetTracker.cpp
+++ b/lib/Analysis/AliasSetTracker.cpp
@@ -294,7 +294,10 @@
bool AliasSetTracker::add(VAArgInst *VAAI) {
bool NewPtr;
- addPointer(VAAI->getOperand(0), ~0, AliasSet::ModRef, NewPtr);
+ AliasSet &AS = addPointer(VAAI->getOperand(0), ~0, AliasSet::ModRef, NewPtr);
+
+ // Treat vaarg instructions as volatile (not to be moved).
+ AS.setVolatile();
return NewPtr;
}