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PR-URL: https://github.com/nodejs/node/pull/44741 Fixes: https://github.com/nodejs/node/issues/44650 Fixes: https://github.com/nodejs/node/issues/37472 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: James M Snell <jasnell@gmail.com>
40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
// Copyright 2018 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Flags: --allow-natives-syntax --turbofan --no-assert-types
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// Test that NumberMax properly passes the kIdentifyZeros truncation.
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(function() {
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function foo(x) {
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if (Math.max(x * -2, 1) == 1) return 0;
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return 1;
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(0, foo(2));
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assertEquals(1, foo(-1));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(0, foo(2));
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assertEquals(1, foo(-1));
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assertOptimized(foo);
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// Now `foo` should stay optimized even if `x * -2` would produce `-0`.
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assertEquals(0, foo(0));
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assertOptimized(foo);
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})();
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// Test that NumberMax properly handles 64-bit comparisons.
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(function() {
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function foo(x) {
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x = x|0;
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return Math.max(x - 1, x + 1);
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(-Math.pow(2, 31) + 1, foo(-Math.pow(2, 31)));
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assertEquals(Math.pow(2, 31), foo(Math.pow(2, 31) - 1));
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(-Math.pow(2, 31) + 1, foo(-Math.pow(2, 31)));
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assertEquals(Math.pow(2, 31), foo(Math.pow(2, 31) - 1));
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})();
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