commit cea1fdd1748e06455940d3aa8a258ab65f232840
author Chris Lattner <sabre@nondot.org> Tue Apr 29 04:58:38 2008 +0000
committer Chris Lattner <sabre@nondot.org> Tue Apr 29 04:58:38 2008 +0000
tree 68a0f1888b2e0fffa856906ef57254e4291645c0
parent 3fb2968f2febbcd8e05270270858b6f2afd4b342

don't delete the last store to an alloca if the store is volatile.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50390 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/InstructionCombining.cpp

diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp
index 655ab10..c707e6e 100644
--- a/lib/Transforms/Scalar/InstructionCombining.cpp
+++ b/lib/Transforms/Scalar/InstructionCombining.cpp
@@ -10311,7 +10311,7 @@
   
   // If the RHS is an alloca with a single use, zapify the store, making the
   // alloca dead.
-  if (Ptr->hasOneUse()) {
+  if (Ptr->hasOneUse() && !SI.isVolatile()) {
     if (isa<AllocaInst>(Ptr)) {
       EraseInstFromFunction(SI);
       ++NumCombined;