aebad779e9
Currently it falls back to runtime for externalized strings. Bug: v8:7700 Change-Id: I9bc09969915e437af5fcf563ba74a6edd9280779 Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3956975 Commit-Queue: Victor Gomes <victorgomes@chromium.org> Reviewed-by: Leszek Swirski <leszeks@chromium.org> Cr-Commit-Position: refs/heads/main@{#83745}
69 lines
1.5 KiB
JavaScript
69 lines
1.5 KiB
JavaScript
// Copyright 2022 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 --maglev
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// Sequential string (1 byte string).
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(function() {
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let s = "my string";
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function foo() {
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return s[3];
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals("s", foo());
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%OptimizeMaglevOnNextCall(foo);
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assertEquals("s", foo());
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})();
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// Sequential string (2 byte string).
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(function() {
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let s = "my ⚡tring";
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function foo() {
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return s[3];
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals("⚡", foo());
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%OptimizeMaglevOnNextCall(foo);
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assertEquals("⚡", foo());
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})();
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// Cons string.
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(function() {
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let s = "my"
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s += " ";
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s += "string";
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function foo() {
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return s[3];
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals("s", foo());
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%OptimizeMaglevOnNextCall(foo);
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assertEquals("s", foo());
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})();
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// Thin string.
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(function() {
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let s = %ConstructThinString("my string is thin!");
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function foo() {
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return s[3];
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals("s", foo());
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%OptimizeMaglevOnNextCall(foo);
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assertEquals("s", foo());
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})();
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// Sliced string.
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(function() {
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let main_string = "The quick brown fox jumps over the lazy dog.";
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let s = main_string.slice(4, 19);
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function foo() {
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return s[0];
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}
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%PrepareFunctionForOptimization(foo);
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assertEquals("q", foo());
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%OptimizeMaglevOnNextCall(foo);
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assertEquals("q", foo());
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})();
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