src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/IntegerLessThanNode.java
--- a/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/IntegerLessThanNode.java Tue Mar 12 12:12:01 2019 -0700
+++ b/src/jdk.internal.vm.compiler/share/classes/org.graalvm.compiler.nodes/src/org/graalvm/compiler/nodes/calc/IntegerLessThanNode.java Tue Mar 12 19:17:42 2019 +0100
@@ -50,6 +50,7 @@
import jdk.vm.ci.meta.JavaKind;
import jdk.vm.ci.meta.MetaAccessProvider;
import jdk.vm.ci.meta.PrimitiveConstant;
+import jdk.vm.ci.meta.TriState;
@NodeInfo(shortName = "<")
public final class IntegerLessThanNode extends IntegerLowerThanNode {
@@ -225,7 +226,6 @@
}
}
}
-
}
}
@@ -296,4 +296,29 @@
return StampFactory.forInteger(bits, cast(min, bits), cast(max, bits));
}
}
+
+ @Override
+ public TriState implies(boolean thisNegated, LogicNode other) {
+ if (!thisNegated) {
+ if (other instanceof IntegerLessThanNode) {
+ ValueNode otherX = ((IntegerLessThanNode) other).getX();
+ ValueNode otherY = ((IntegerLessThanNode) other).getY();
+ // x < y => !y < x
+ if (getX() == otherY && getY() == otherX) {
+ return TriState.FALSE;
+ }
+ }
+
+ // x < y => !x == y
+ // x < y => !y == x
+ if (other instanceof IntegerEqualsNode) {
+ ValueNode otherX = ((IntegerEqualsNode) other).getX();
+ ValueNode otherY = ((IntegerEqualsNode) other).getY();
+ if ((getX() == otherX && getY() == otherY) || (getX() == otherY && getY() == otherX)) {
+ return TriState.FALSE;
+ }
+ }
+ }
+ return super.implies(thisNegated, other);
+ }
}