31a3cfbc10
BUG=v8:8801 Change-Id: I9d9d9824c6c9ad0176bbfd3723da1b578b17c256 Reviewed-on: https://chromium-review.googlesource.com/c/1495555 Commit-Queue: Ross McIlroy <rmcilroy@chromium.org> Reviewed-by: Mythri Alle <mythria@chromium.org> Cr-Commit-Position: refs/heads/master@{#60001}
36 lines
1.1 KiB
JavaScript
36 lines
1.1 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
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// This tests that SpeculativeNumberSubtract can still lower to
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// Int32Sub in SimplifiedLowering, which requires some magic
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// to make sure that SpeculativeNumberSubtract survives to that
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// point, especially the JSTypedLowering needs to be unable
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// to tell that the inputs to SpeculativeNumberAdd are not
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// Number, Undefined, Null or Boolean.
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(function() {
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// We need a function that has a - with feedback Number or
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// NumberOrOddball, but for whose inputs the JSTypedLowering
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// cannot reduce it to NumberSubtract (with SpeculativeToNumber
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// conversions). We achieve this utilizing an object literal
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// indirection here.
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function baz(x) {
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return {x}.x - x;
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}
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baz(null);
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baz(undefined);
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// Now we just need to truncate the result.
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function foo(x) {
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return baz(42) | 0;
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals(0, foo());
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assertEquals(0, foo());
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%OptimizeFunctionOnNextCall(foo);
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assertEquals(0, foo());
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})();
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