Add floor, ceil, round (truncate) instructions for ia32, x64 (if SSE4.1) and

test/mjsunit/asm/math-ceil.js

+// 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.
+
+function Module(stdlib) {
+  "use asm";
+
+  var ceil = stdlib.Math.ceil;
+
+  // f: double -> float
+  function f(a) {
+    a = +a;
+    return ceil(a);
+  }
+
+  return { f: f };
+}
+
+var f = Module({ Math: Math }).f;
+
+assertTrue(isNaN(f(NaN)));
+assertTrue(isNaN(f(undefined)));
+assertTrue(isNaN(f(function() {})));
+
+assertEquals(0,                   f(0));
+assertEquals(+0,                  f(+0));
+assertEquals(-0,                  f(-0));
+assertEquals(1,                   f(0.49999));
+assertEquals(1,                   f(0.6));
+assertEquals(1,                   f(0.5));
+assertEquals(-0,                  f(-0.1));
+assertEquals(-0,                  f(-0.5));
+assertEquals(-0,                  f(-0.6));
+assertEquals(-1,                  f(-1.6));
+assertEquals(-0,                  f(-0.50001));
+
+assertEquals("Infinity", String(f(Infinity)));
+assertEquals("-Infinity", String(f(-Infinity)));