commit 4f7d107d1d2b2392ce8eb1647e2daa04a81f6c99
author Gabor Greif <ggreif@gmail.com> Tue Sep 14 20:46:08 2010 +0000
committer Gabor Greif <ggreif@gmail.com> Tue Sep 14 20:46:08 2010 +0000
tree f51601e0e8ef4955ae8f6ff2df050405e661bc5b
parent 1685caffedd0d0b351e0ec475d2529d90efec2fd

must not peephole away side effects

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113848 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/PeepholeOptimizer.cpp

diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp
index 15ede91..28a4a9e 100644
--- a/lib/CodeGen/PeepholeOptimizer.cpp
+++ b/lib/CodeGen/PeepholeOptimizer.cpp
@@ -269,7 +269,8 @@
            MII = I->begin(), MIE = I->end(); MII != MIE; ) {
       MachineInstr *MI = &*MII;
 
-      if (MI->getDesc().isCompare()) {
+      if (MI->getDesc().isCompare() &&
+          !MI->getDesc().hasUnmodeledSideEffects()) {
         if (OptimizeCmpInstr(MI, MBB, MII))
           Changed = true;
         else