5edec0e39a
PR-URL: https://github.com/nodejs/node/pull/55014 Reviewed-By: Matteo Collina <matteo.collina@gmail.com> Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
40 lines
914 B
JavaScript
40 lines
914 B
JavaScript
// Copyright 2024 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 --no-maglev-loop-peeling
|
|
|
|
function g() { }
|
|
%NeverOptimizeFunction(g);
|
|
|
|
function foo(b) {
|
|
let phi1 = 0;
|
|
for (let i = 0; i < 10; i++) {
|
|
phi1++; // Int32 use so that {phi1} gets untagged.
|
|
}
|
|
|
|
let phi2 = undefined; // Not untaggable.
|
|
let j = 0;
|
|
|
|
if (b) {
|
|
g(phi1); // Triggering retagging of {phi1}.
|
|
}
|
|
|
|
// Nothing between the `if` and the loop header, so that the loop header ends
|
|
// up having 2 incoming forward edges.
|
|
|
|
for (; j < 5; j++) {
|
|
phi2 = phi1; // New retagging of {phi1} since previous one is not available
|
|
// in all predecessors.
|
|
}
|
|
|
|
return phi2;
|
|
}
|
|
|
|
%PrepareFunctionForOptimization(foo);
|
|
foo(true);
|
|
foo(false);
|
|
|
|
%OptimizeMaglevOnNextCall(foo);
|
|
foo(true);
|