# HG changeset patch
# User Lukas Stadler <lukas.stadler@jku.at>
# Date 1370425493 -7200
# Node ID fb010fd0b384d0dea7e8121904247095b6d79633
# Parent  d59b9078978c3549a833bd51fd001818c1f27fba
only create overflow guards for loops that have safepoints

diff -r d59b9078978c -r fb010fd0b384 graal/com.oracle.graal.loop/src/com/oracle/graal/loop/phases/LoopSafepointEliminationPhase.java
--- a/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/phases/LoopSafepointEliminationPhase.java	Wed Jun 05 11:44:05 2013 +0200
+++ b/graal/com.oracle.graal.loop/src/com/oracle/graal/loop/phases/LoopSafepointEliminationPhase.java	Wed Jun 05 11:44:53 2013 +0200
@@ -39,9 +39,15 @@
             loops.detectedCountedLoops();
             for (LoopEx loop : loops.countedLoops()) {
                 if (loop.lirLoop().children.isEmpty() && loop.counted().getKind() == Kind.Int) {
-                    loop.counted().createOverFlowGuard();
+                    boolean hasSafepoint = false;
                     for (LoopEndNode loopEnd : loop.loopBegin().loopEnds()) {
-                        loopEnd.disableSafepoint();
+                        hasSafepoint |= loopEnd.canSafepoint();
+                    }
+                    if (hasSafepoint) {
+                        loop.counted().createOverFlowGuard();
+                        for (LoopEndNode loopEnd : loop.loopBegin().loopEnds()) {
+                            loopEnd.disableSafepoint();
+                        }
                     }
                 }
             }