v8/test/mjsunit/ensure-growing-store-learns.js
Jakob Linke 6904a8120b [cleanup] Remove --stress-opt remnants
.. mostly mentions in mjsunit `Flags:` lines and in comments.

Bug: v8:10386
Change-Id: If79dfdc448d0a3f19883ef1f816e77e750cb4061
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3865964
Commit-Queue: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#82852}
2022-08-31 08:37:44 +00:00

96 lines
2.8 KiB
JavaScript

// Copyright 2015 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.
// Overwrite the value for --noverify-heap and
// --noenable-slow-asserts, which the test runner already set to true before.
// Due to flag contradiction checking, this requires
// --allow-overwriting-for-next-flag to avoid an error.
// Flags: --allow-overwriting-for-next-flag --noverify-heap
// Flags: --allow-overwriting-for-next-flag --noenable-slow-asserts
// Flags: --allow-natives-syntax --turbofan --no-always-turbofan
// --noverify-heap and --noenable-slow-asserts are set because the test is too
// slow with it on.
// Ensure that keyed stores work, and optimized functions learn if the
// store required change to dictionary mode. Verify that stores that grow
// the array into large object space don't cause a deopt.
(function() {
var a = [];
function foo(a, i) {
a[i] = 5.3;
}
%PrepareFunctionForOptimization(foo);
foo(a, 1);
foo(a, 2);
foo(a, 3);
%OptimizeFunctionOnNextCall(foo);
a[3] = 0;
foo(a, 3);
assertEquals(a[3], 5.3);
foo(a, 50000);
// TODO(v8:11457) We don't currently support inlining element stores if there
// is a dictionary mode prototypes on the prototype chain. Therefore, if
// v8_dict_property_const_tracking is enabled, the optimized code only
// contains a call to the IC handler and doesn't get deopted.
assertEquals(%IsDictPropertyConstTrackingEnabled(), isOptimized(foo));
assertTrue(%HasDictionaryElements(a));
%PrepareFunctionForOptimization(foo);
var b = [];
foo(b, 1);
foo(b, 2);
// Put b in dictionary mode.
b[10000] = 5;
assertTrue(%HasDictionaryElements(b));
foo(b, 3);
%PrepareFunctionForOptimization(foo);
%OptimizeFunctionOnNextCall(foo);
foo(b, 50000);
assertOptimized(foo);
assertTrue(%HasDictionaryElements(b));
%ClearFunctionFeedback(foo);
})();
(function() {
var a = new Array(10);
function foo2(a, i) {
a[i] = 50;
}
// The KeyedStoreIC will learn GROW_MODE.
%PrepareFunctionForOptimization(foo2);
foo2(a, 10);
foo2(a, 12);
foo2(a, 31);
%OptimizeFunctionOnNextCall(foo2);
foo2(a, 40);
assertOptimized(foo2);
assertTrue(%HasSmiElements(a));
// Grow a large array into large object space through the keyed store
// without deoptimizing. Grow by 9s. If we set elements too sparsely, the
// array will convert to dictionary mode.
a = new Array(99999);
assertTrue(%HasSmiElements(a));
for (var i = 0; i < 263000; i += 9) {
foo2(a, i);
}
// Verify that we are over 1 page in size, and foo2 remains optimized.
// This means we've smoothly transitioned to allocating in large object
// space.
assertTrue(%HasSmiElements(a));
assertTrue(a.length * 4 > (1024 * 1024));
assertOptimized(foo2);
%ClearFunctionFeedback(foo2);
})();