Version 3.0.0.
Improved performance by (partially) addressing issue 957 on IA-32. Still needs more work for the other architectures.
git-svn-id: http://v8.googlecode.com/svn/trunk@5932 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
diff --git a/test/mjsunit/compiler/null-compare.js b/test/mjsunit/compiler/null-compare.js
new file mode 100644
index 0000000..e01b555
--- /dev/null
+++ b/test/mjsunit/compiler/null-compare.js
@@ -0,0 +1,54 @@
+// Copyright 2010 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following
+// disclaimer in the documentation and/or other materials provided
+// with the distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived
+// from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+function IsNull(x) {
+ if (x == null) return true; else return false;
+}
+
+assertTrue(IsNull(null), "null == null");
+assertTrue(IsNull(void 0), "void 0 == null");
+assertFalse(IsNull(42), "42 != null");
+
+
+function IsNullStrict(x) {
+ if (x === null) return true; else return false;
+}
+
+assertTrue(IsNullStrict(null), "null === null");
+assertFalse(IsNullStrict(void 0), "void 0 != null");
+assertFalse(IsNullStrict(87), "87 !== null");
+
+
+function GimmeFalse(x) {
+ if ((x & 1) == null) return true;
+ if ((x | 3) === null) return true;
+ return false;
+}
+
+assertFalse(GimmeFalse(1), "GimmeFalse(1)");
+assertFalse(GimmeFalse(null), "GimmeFalse(null)");
+assertFalse(GimmeFalse({}), "GimmeFalse({})");