# HG changeset patch
# User Gilles Duboscq <duboscq@ssw.jku.at>
# Date 1339587639 -7200
# Node ID 5ad40c8ba3ed9ef5504865b0b95385f141331fd0
# Parent  300a1207f2146342ed1f727ce6b78e0317ae4a7e
add StampFactory.negate(IntegerStamp), use it for NegateNode

diff -r 300a1207f214 -r 5ad40c8ba3ed graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NegateNode.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NegateNode.java	Wed Jun 13 11:10:57 2012 +0200
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/calc/NegateNode.java	Wed Jun 13 13:40:39 2012 +0200
@@ -38,12 +38,12 @@
     }
 
     /**
-     * Creates new NegateOp instance.
+     * Creates new NegateNode instance.
      *
      * @param x the instruction producing the value that is input to this instruction
      */
     public NegateNode(ValueNode x) {
-        super(StampFactory.forKind(x.kind()));
+        super(x.stamp() instanceof IntegerStamp ? StampFactory.negate((IntegerStamp) x.stamp()) : StampFactory.forKind(x.kind()));
         this.x = x;
     }
 
diff -r 300a1207f214 -r 5ad40c8ba3ed graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampFactory.java
--- a/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampFactory.java	Wed Jun 13 11:10:57 2012 +0200
+++ b/graal/com.oracle.graal.nodes/src/com/oracle/graal/nodes/type/StampFactory.java	Wed Jun 13 13:40:39 2012 +0200
@@ -129,6 +129,14 @@
         }
     }
 
+    public static Stamp negate(IntegerStamp stamp) {
+        Kind kind = stamp.kind();
+        if (stamp.lowerBound() != kind.minValue()) {
+            return new IntegerStamp(kind, -stamp.upperBound(), -stamp.lowerBound());
+        }
+        return forKind(kind);
+    }
+
     public static Stamp object() {
         return objectStamp;
     }