node/deps/v8/test/mjsunit/compiler/number-modulus.js
Michaël Zasso 270253c4e2
deps: update V8 to 9.7.106.18
PR-URL: https://github.com/nodejs/node/pull/40907
Reviewed-By: Jiawen Geng <technicalcute@gmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
2022-01-20 10:38:37 +01:00

28 lines
829 B
JavaScript

// Copyright 2018 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 --opt --no-always-opt --no-assert-types
// Test that NumberModulus passes kIdentifiesZero to the
// left hand side input when the result doesn't care about
// 0 vs -0, even when the inputs are outside Signed32.
(function() {
function foo(x) {
return (x * -2) % (2 ** 32) === 0;
}
%PrepareFunctionForOptimization(foo);
assertFalse(foo(2));
assertFalse(foo(1));
%OptimizeFunctionOnNextCall(foo);
assertFalse(foo(2));
assertFalse(foo(1));
// Now `foo` should stay optimized even if `x * -2` would
// produce -0, aka when we pass a zero value for `x`.
assertTrue(foo(0));
assertOptimized(foo);
})();