Extend JSBuiltinReducer to cover Math.abs as well.

test/mjsunit/asm/math-abs.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 abs = stdlib.Math.abs;
+
+  // f: double -> double
+  function f(a) {
+    a = +a;
+    return abs(a);
+  }
+
+  // g: unsigned -> double
+  function g(a) {
+    a = a>>>0;
+    return abs(a);
+  }
+
+  // h: signed -> double
+  function h(a) {
+    a = a|0;
+    return abs(a);
+  }
+
+  return { f: f, g: g, h: h };
+}
+
+var m = Module({ Math: Math });
+var f = m.f;
+var g = m.g;
+var h = m.h;
+
+assertTrue(isNaN(f(NaN)));
+assertTrue(isNaN(f(undefined)));
+assertTrue(isNaN(f(function() {})));
+
+assertEquals("Infinity", String(1/f(0)));
+assertEquals("Infinity", String(1/f(-0)));
+assertEquals("Infinity", String(f(Infinity)));
+assertEquals("Infinity", String(f(-Infinity)));
+
+assertEquals(0,   f(0));
+assertEquals(0.1, f(0.1));
+assertEquals(0.5, f(0.5));
+assertEquals(0.1, f(-0.1));
+assertEquals(0.5, f(-0.5));
+assertEquals(1,   f(1));
+assertEquals(1.1, f(1.1));
+assertEquals(1.5, f(1.5));
+assertEquals(1,   f(-1));
+assertEquals(1.1, f(-1.1));
+assertEquals(1.5, f(-1.5));
+
+assertEquals(0,          g(0));
+assertEquals(0,          g(0.1));
+assertEquals(0,          g(0.5));
+assertEquals(0,          g(-0.1));
+assertEquals(0,          g(-0.5));
+assertEquals(1,          g(1));
+assertEquals(1,          g(1.1));
+assertEquals(1,          g(1.5));
+assertEquals(4294967295, g(-1));
+assertEquals(4294967295, g(-1.1));
+assertEquals(4294967295, g(-1.5));
+
+assertEquals(0, h(0));
+assertEquals(0, h(0.1));
+assertEquals(0, h(0.5));
+assertEquals(0, h(-0.1));
+assertEquals(0, h(-0.5));
+assertEquals(1, h(1));
+assertEquals(1, h(1.1));
+assertEquals(1, h(1.5));
+assertEquals(1, h(-1));
+assertEquals(1, h(-1.1));
+assertEquals(1, h(-1.5));
+
+assertEquals(Number.MIN_VALUE, f(Number.MIN_VALUE));
+assertEquals(Number.MIN_VALUE, f(-Number.MIN_VALUE));
+assertEquals(Number.MAX_VALUE, f(Number.MAX_VALUE));
+assertEquals(Number.MAX_VALUE, f(-Number.MAX_VALUE));