9e0dc8b472- copyBytesFrom: calculate byte offsets directly instead of
slicing into an intermediate typed array
- toString('hex'): use V8 Uint8Array.prototype.toHex() builtin
- fill: add single-char ASCII fast path
- indexOf: use indexOfString directly for ASCII encoding
- swap16/32/64: add V8 Fast API functions
PR-URL: https://github.com/nodejs/node/pull/61871
Reviewed-By: Stephen Belanger <admin@stephenbelanger.com>
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Yagiz Nizipli <yagiz@nizipli.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
55 lines
1.8 KiB
JavaScript
55 lines
1.8 KiB
JavaScript
// Flags: --expose-internals --no-warnings --allow-natives-syntax
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'use strict';
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const common = require('../common');
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const assert = require('assert');
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function testFastSwap16() {
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const buf = Buffer.from([0x01, 0x02, 0x03, 0x04]);
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const expected = Buffer.from([0x02, 0x01, 0x04, 0x03]);
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const padded = Buffer.alloc(256);
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buf.copy(padded);
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padded.swap16();
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assert.deepStrictEqual(padded.subarray(0, 4), expected);
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}
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function testFastSwap32() {
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const buf = Buffer.from([0x01, 0x02, 0x03, 0x04]);
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const expected = Buffer.from([0x04, 0x03, 0x02, 0x01]);
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const padded = Buffer.alloc(256);
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buf.copy(padded);
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padded.swap32();
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assert.deepStrictEqual(padded.subarray(0, 4), expected);
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}
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function testFastSwap64() {
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const buf = Buffer.from([0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08]);
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const expected = Buffer.from([0x08, 0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01]);
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const padded = Buffer.alloc(256);
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buf.copy(padded);
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padded.swap64();
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assert.deepStrictEqual(padded.subarray(0, 8), expected);
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}
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eval('%PrepareFunctionForOptimization(Buffer.prototype.swap16)');
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testFastSwap16();
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eval('%OptimizeFunctionOnNextCall(Buffer.prototype.swap16)');
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testFastSwap16();
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eval('%PrepareFunctionForOptimization(Buffer.prototype.swap32)');
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testFastSwap32();
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eval('%OptimizeFunctionOnNextCall(Buffer.prototype.swap32)');
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testFastSwap32();
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eval('%PrepareFunctionForOptimization(Buffer.prototype.swap64)');
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testFastSwap64();
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eval('%OptimizeFunctionOnNextCall(Buffer.prototype.swap64)');
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testFastSwap64();
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if (common.isDebug) {
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const { internalBinding } = require('internal/test/binding');
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const { getV8FastApiCallCount } = internalBinding('debug');
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assert.strictEqual(getV8FastApiCallCount('buffer.swap16'), 1);
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assert.strictEqual(getV8FastApiCallCount('buffer.swap32'), 1);
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assert.strictEqual(getV8FastApiCallCount('buffer.swap64'), 1);
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}
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