e797f9fb34
This extends the typing rule for NumberTrunc to deal with general number inputs properly, thus addressing a long-standing TODO. We also add test cases to ensure that the typing rule gets the corner cases for NaN and -0 right. Bug: v8:5267, v8:7109 Change-Id: Iedc541a0f4619f37da37ea36940f92472034cdf2 Reviewed-on: https://chromium-review.googlesource.com/792932 Reviewed-by: Yang Guo <yangguo@chromium.org> Commit-Queue: Benedikt Meurer <bmeurer@chromium.org> Cr-Commit-Position: refs/heads/master@{#49652}
40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
// Copyright 2017 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
|
|
|
|
// Ensure that the typing rule for Math.trunc deals correctly with
|
|
// inputs in the range (-1.0,0.0), which are mapped to -0.
|
|
(function() {
|
|
function foo(x) {
|
|
// Arrange x such that TurboFan infers type PlainNumber \/ NaN.
|
|
x = +x;
|
|
x = Math.abs(x) - 1.0;
|
|
return Object.is(-0, Math.trunc(x));
|
|
}
|
|
|
|
assertFalse(foo(1.5));
|
|
assertTrue(foo(0.5));
|
|
%OptimizeFunctionOnNextCall(foo);
|
|
assertFalse(foo(1.5));
|
|
assertTrue(foo(0.5));
|
|
})();
|
|
|
|
// Ensure that the typing rule for Math.trunc deals correctly with
|
|
// NaN inputs, which are mapped to NaN.
|
|
(function() {
|
|
function foo(x) {
|
|
// Arrange x such that TurboFan infers type PlainNumber \/ NaN.
|
|
x = +x;
|
|
x = Math.abs(x) - 1.0;
|
|
return Object.is(NaN, Math.trunc(x));
|
|
}
|
|
|
|
assertFalse(foo(1.5));
|
|
assertTrue(foo(NaN));
|
|
%OptimizeFunctionOnNextCall(foo);
|
|
assertFalse(foo(1.5));
|
|
assertTrue(foo(NaN));
|
|
})();
|