Introduce intrinsics for double values in Javascript.

test/mjsunit/double-intrinsics.js

Index: test/mjsunit/double-intrinsics.js
diff --git a/test/mjsunit/double-intrinsics.js b/test/mjsunit/double-intrinsics.js
new file mode 100644
index 0000000000000000000000000000000000000000..83490b58f3a25f70c08485f635a6cd62fc7cdef6
--- /dev/null
+++ b/test/mjsunit/double-intrinsics.js
@@ -0,0 +1,37 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Flags: --allow-natives-syntax
+
+function assertDoubleBits(hi, lo, x) {
+  hi = hi | 0;
+  lo = lo | 0;
+  assertEquals(x, %_ConstructDouble(hi, lo));
+  assertEquals(hi, %_DoubleHi(x));
+  assertEquals(lo, %_DoubleLo(x));
+  assertEquals(x, %_ConstructDouble(%_DoubleHi(x), %_DoubleLo(x)));
+}
+
+
+var tests = [0x7ff80000, 0x00000000, NaN,
+             0x7ff00000, 0x00000000, Infinity,
+             0xfff00000, 0x00000000, -Infinity,
+             0x80000000, 0x00000000, -0,
+             0x400921fb, 0x54442d18, Math.PI,
+             0xc00921fb, 0x54442d18, -Math.PI,
+             0x4005bf0a, 0x8b145769, Math.E,
+             0xc005bf0a, 0x8b145769, -Math.E,
+             0xbfe80000, 0x00000000, -0.75];
+
+
+for (var i = 0; i < tests.length; i += 3) {
+  assertDoubleBits(tests[i], tests[i + 1], tests[i + 2]);
+}
+
+%OptimizeFunctionOnNextCall(assertDoubleBits);
+
+for (var i = 0; i < tests.length; i += 3) {
+  assertDoubleBits(tests[i], tests[i + 1], tests[i + 2]);
+  assertOptimized(assertDoubleBits);
+}