# HG changeset patch
# User Roland Schatz <roland.schatz@oracle.com>
# Date 1398713438 -7200
# Node ID 997bfb0634172909dfccc60e2669df795d24c14f
# Parent  3a6dffce51585208d1038e91b870414fad272ae1
Fix bug in CompareNode canonicalization.

diff -r 3a6dffce5158 -r 997bfb063417 graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java	Mon Apr 28 12:11:20 2014 -0700
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/CompareNode.java	Mon Apr 28 21:30:38 2014 +0200
@@ -120,7 +120,7 @@
         if (x() instanceof ConvertNode && y() instanceof ConvertNode) {
             ConvertNode convertX = (ConvertNode) x();
             ConvertNode convertY = (ConvertNode) y();
-            if (convertX.isLossless() && convertY.isLossless() && convertX.getInput().stamp().isCompatible(convertY.getInput().stamp())) {
+            if (convertX.preservesOrder(condition()) && convertY.preservesOrder(condition()) && convertX.getInput().stamp().isCompatible(convertY.getInput().stamp())) {
                 setX(convertX.getInput());
                 setY(convertY.getInput());
             }
@@ -142,8 +142,8 @@
         return this;
     }
 
-    private static ConstantNode canonicalConvertConstant(ConvertNode convert, Constant constant) {
-        if (convert.isLossless()) {
+    private ConstantNode canonicalConvertConstant(ConvertNode convert, Constant constant) {
+        if (convert.preservesOrder(condition())) {
             Constant reverseConverted = convert.reverse(constant);
             if (convert.convert(reverseConverted).equals(constant)) {
                 return ConstantNode.forPrimitive(convert.getInput().stamp(), reverseConverted, convert.graph());
diff -r 3a6dffce5158 -r 997bfb063417 graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConvertNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConvertNode.java	Mon Apr 28 12:11:20 2014 -0700
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ConvertNode.java	Mon Apr 28 21:30:38 2014 +0200
@@ -24,6 +24,7 @@
 
 import com.oracle.graal.api.code.*;
 import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.common.calc.*;
 import com.oracle.graal.compiler.common.type.*;
 import com.oracle.graal.nodes.*;
 
@@ -47,8 +48,23 @@
 
     public abstract Constant reverse(Constant c);
 
+    /**
+     * Check whether a conversion is lossless.
+     *
+     * @return true iff reverse(convert(c)) == c for all c
+     */
     public abstract boolean isLossless();
 
+    /**
+     * Check whether a conversion preserves comparison order.
+     *
+     * @param op a comparison operator
+     * @return true iff (c1 op c2) == (convert(c1) op convert(c2)) for all c1, c2
+     */
+    public boolean preservesOrder(Condition op) {
+        return isLossless();
+    }
+
     @Override
     public Constant evalConst(Constant... inputs) {
         assert inputs.length == 1;
diff -r 3a6dffce5158 -r 997bfb063417 graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java	Mon Apr 28 12:11:20 2014 -0700
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/ZeroExtendNode.java	Mon Apr 28 21:30:38 2014 +0200
@@ -23,6 +23,7 @@
 package com.oracle.graal.nodes.calc;
 
 import com.oracle.graal.api.meta.*;
+import com.oracle.graal.compiler.common.calc.*;
 import com.oracle.graal.compiler.common.type.*;
 import com.oracle.graal.graph.*;
 import com.oracle.graal.graph.spi.*;
@@ -64,6 +65,19 @@
     }
 
     @Override
+    public boolean preservesOrder(Condition op) {
+        switch (op) {
+            case GE:
+            case GT:
+            case LE:
+            case LT:
+                return false;
+            default:
+                return true;
+        }
+    }
+
+    @Override
     public Node canonical(CanonicalizerTool tool) {
         ValueNode ret = canonicalConvert();
         if (ret != null) {