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changeset 22120:7f897280b00f

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killWithUnusedFloatingInputs should kill trivial loop Phis
author Tom Rodriguez <tom.rodriguez@oracle.com>
date Mon, 29 Jun 2015 10:13:14 -0700
parents 6b5221d7b5c1
children f9ca79a05f72
files graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java
diffstat 1 files changed, 12 insertions(+), 2 deletions(-) [+]
line wrap: on
line diff
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java	Mon Jun 29 17:24:09 2015 +0200
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/util/GraphUtil.java	Mon Jun 29 10:13:14 2015 -0700
@@ -152,8 +152,18 @@
     public static void killWithUnusedFloatingInputs(Node node) {
         node.safeDelete();
         node.acceptInputs((n, in) -> {
-            if (in.isAlive() && in.hasNoUsages() && !(in instanceof FixedNode)) {
-                killWithUnusedFloatingInputs(in);
+            if (in.isAlive() && !(in instanceof FixedNode)) {
+                if (in.hasNoUsages()) {
+                    killWithUnusedFloatingInputs(in);
+                } else if (in instanceof PhiNode) {
+                    for (Node use : in.usages()) {
+                        if (use != in) {
+                            return;
+                        }
+                    }
+                    in.replaceAtUsages(null);
+                    killWithUnusedFloatingInputs(in);
+                }
             }
         });
     }