f0e95769db
This CL migrates the CPP builtin to CSA with fast paths for strings that can be unpacked to direct one-byte strings. Short strings are handled directly in CSA, others need to call into C for conversion. Microbenchmarks for "abcd".toLowerCase() show speedups of 2.5x. BUG=v8:6353,v8:6344 Review-Url: https://codereview.chromium.org/2859203002 Cr-Commit-Position: refs/heads/master@{#45141}
87 lines
3.3 KiB
JavaScript
87 lines
3.3 KiB
JavaScript
// Copyright 2008 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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// Flags: --random-seed=17 --allow-natives-syntax
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// Flags: --expose-externalize-string
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assertEquals("ΚΟΣΜΟΣ ΚΟΣΜΟΣ".toLowerCase(), "κοσμος κοσμος");
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var A_CODE = "A".charCodeAt(0);
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var Z_CODE = "Z".charCodeAt(0);
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var a_CODE = "a".charCodeAt(0);
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var z_CODE = "z".charCodeAt(0);
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function charCodeToLower(charCode) {
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if (A_CODE <= charCode && charCode <= Z_CODE) {
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return charCode + a_CODE - A_CODE;
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}
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return charCode;
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}
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function charCodeToUpper(charCode) {
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if (a_CODE <= charCode && charCode <= z_CODE) {
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return charCode - (a_CODE - A_CODE);
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}
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return charCode;
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}
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function test(length) {
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var str = "";
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var strLower = "";
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var strUpper = "";
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for (var i = 0; i < length; i++) {
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var c = Math.round(0x7f * Math.random());
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str += String.fromCharCode(c);
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strLower += String.fromCharCode(charCodeToLower(c));
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strUpper += String.fromCharCode(charCodeToUpper(c));
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}
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str = %FlattenString(str);
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strLower = %FlattenString(strLower);
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strUpper = %FlattenString(strUpper);
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// Sequential string.
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assertEquals(strLower, str.toLowerCase());
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assertEquals(strUpper, str.toUpperCase());
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// Cons string.
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assertEquals(strLower + strLower, (str + str).toLowerCase());
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assertEquals(strUpper + strUpper, (str + str).toUpperCase());
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// Sliced string.
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assertEquals(strLower.substring(1), str.substring(1).toLowerCase());
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assertEquals(strUpper.substring(1), str.substring(1).toUpperCase());
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// External string.
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externalizeString(str, false);
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assertEquals(strLower, str.toLowerCase());
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assertEquals(strUpper, str.toUpperCase());
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}
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for (var i = 1; i <= 128; i <<= 1); {
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for (var j = 0; j < 8; j++) {
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for (var k = 0; k < 3; k++) {
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test(i + j);
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}
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}
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}
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