[builtins] Make Math.ceil, Math.trunc and Math.round optimizable.

test/mjsunit/math-ceil.js

+// Copyright 2016 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: --max-semi-space-size=1 --allow-natives-syntax
+
+var test_id = 0;
+
+function testCeil(expect, input) {
+  var test = new Function('n',
+                          '"' + (test_id++) + '";return Math.ceil(n)');
+  assertEquals(expect, test(input));
+  assertEquals(expect, test(input));
+  assertEquals(expect, test(input));
+  %OptimizeFunctionOnNextCall(test);
+  assertEquals(expect, test(input));
+
+  var test_double_input = new Function(
+      'n',
+      '"' + (test_id++) + '";return Math.ceil(+n)');
+  assertEquals(expect, test_double_input(input));
+  assertEquals(expect, test_double_input(input));
+  assertEquals(expect, test_double_input(input));
+  %OptimizeFunctionOnNextCall(test_double_input);
+  assertEquals(expect, test_double_input(input));
+
+  var test_double_output = new Function(
+      'n',
+      '"' + (test_id++) + '";return Math.ceil(n) + -0.0');
+  assertEquals(expect, test_double_output(input));
+  assertEquals(expect, test_double_output(input));
+  assertEquals(expect, test_double_output(input));
+  %OptimizeFunctionOnNextCall(test_double_output);
+  assertEquals(expect, test_double_output(input));
+
+  var test_via_floor = new Function(
+      'n',
+      '"' + (test_id++) + '";return -Math.floor(-n)');
+  assertEquals(expect, test_via_floor(input));
+  assertEquals(expect, test_via_floor(input));
+  assertEquals(expect, test_via_floor(input));
+  %OptimizeFunctionOnNextCall(test_via_floor);
+  assertEquals(expect, test_via_floor(input));
+
+  if (input <= 0) {
+    var test_via_trunc = new Function(
+        'n',
+        '"' + (test_id++) + '";return Math.trunc(n)');
+    assertEquals(expect, test_via_trunc(input));
+    assertEquals(expect, test_via_trunc(input));
+    assertEquals(expect, test_via_trunc(input));
+    %OptimizeFunctionOnNextCall(test_via_trunc);
+    assertEquals(expect, test_via_trunc(input));
+  }
+}
+
+function test() {
+  testCeil(0, 0);
+  testCeil(+0, +0);
+  testCeil(-0, -0);
+  testCeil(1, 0.49999);
+  testCeil(1, 0.6);
+  testCeil(1, 0.5);
+  testCeil(-0, -0.1);
+  testCeil(-0, -0.5);
+  testCeil(-0, -0.6);
+  testCeil(-1, -1.6);
+  testCeil(-0, -0.50001);
+  testCeil(Infinity, Infinity);
+  testCeil(-Infinity, -Infinity);
+}
+
+
+// Test in a loop to cover the custom IC and GC-related issues.
+for (var i = 0; i < 10; i++) {
+  test();
+  new Array(i * 10000);
+}