Mercurial > hg > truffle

changeset 9874:fb010fd0b384

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
only create overflow guards for loops that have safepoints
author Lukas Stadler <lukas.stadler@jku.at>
date Wed, 05 Jun 2013 11:44:53 +0200
parents d59b9078978c
children 2c55e8c4a591
files graal/com.oracle.graal.loop/src/com/oracle/graal/loop/phases/LoopSafepointEliminationPhase.java
diffstat 1 files changed, 8 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- 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();
+                        }
                     }
                 }
             }