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}
30 lines
855 B
JavaScript
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);
|