v8/test/mjsunit/compiler/regress-772420.js
Ross McIlroy 31a3cfbc10 [Test] Add PrepareForOptimization to mjsunit/compiler
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}
2019-03-04 12:25:41 +00:00

30 lines
855 B
JavaScript

// Copyright 2017 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
function foo(arg) {
var value;
// None of the branches of this switch are ever taken, but
// the sequence means value could be the hole.
switch (arg) {
case 1:
let let_var = 1;
case 2:
value = let_var;
}
// Speculative number binop with NumberOrOddball feedback.
// Shouldn't be optimized to pure operator since value's phi
// could theoretically be the hole (we would have already thrown a
// reference error in case 2 above if so, but TF typing still
// thinks it could be the hole).
return value * undefined;
}
%PrepareFunctionForOptimization(foo);
foo(3);
foo(3);
%OptimizeFunctionOnNextCall(foo);
foo(3);