must not peephole away side effects

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113848 91177308-0d34-0410-b5e6-96231b3b80d8
hansen0730 · Sep 14, 2010 · 4f7d107 · 4f7d107
1 parent 1685caf
commit 4f7d107
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/lib/CodeGen/PeepholeOptimizer.cpp b/lib/CodeGen/PeepholeOptimizer.cpp
@@ -269,7 +269,8 @@ bool PeepholeOptimizer::runOnMachineFunction(MachineFunction &MF) {
            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