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9d7cd9b864
PR-URL: https://github.com/nodejs/node/pull/54077 Reviewed-By: Jiawen Geng <technicalcute@gmail.com> Reviewed-By: Richard Lau <rlau@redhat.com> Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com> Reviewed-By: Marco Ippolito <marcoippolito54@gmail.com>
51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
// Copyright 2024 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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let c = 0;
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function h() { return c++ > 5; }
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function g() {}
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%NeverOptimizeFunction(g);
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%NeverOptimizeFunction(h);
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function f(x) {
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// {i} will be a loop phi in the 1st loop, but will also be used in the 2nd
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// one.
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let i = 0;
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for (let j = 0; j < 10; j++, i++) {
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// Calling some non-inlined function to make sure that the loop can't be
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// removed.
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g();
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}
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let v = 0;
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// Now a loop that uses a loop phi in its condition, but it's actually a loop
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// phi from a different loop. And the condition has to be false if the initial
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// value of this loop phi would be used, but since we've already ran the other
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// loop, it's the "final" value of the loop phi that will be used the first
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// time in this loop.
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for (; i > 1; ) {
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if (h()) {
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// This is an opaque way to break out of the loop, which won't be used as
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// the main loop exit condition.
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break;
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}
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v++;
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}
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return v;
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}
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%PrepareFunctionForOptimization(f);
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c = 0;
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assertEquals(6, f());
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%OptimizeFunctionOnNextCall(f);
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c = 0;
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assertEquals(6, f());
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