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'use strict';
const common = require('../common.js');
const v8 = require('v8');
const bench = common.createBenchmark(main, {
method: ['offset', 'slice'],
size: [16, 512, 1024, 4096, 16386],
millions: [1]
});
function compareUsingSlice(b0, b1, len, iter) {
// Force optimization before starting the benchmark
Buffer.compare(b0.slice(1, len), b1.slice(1, len));
v8.setFlagsFromString('--allow_natives_syntax');
eval('%OptimizeFunctionOnNextCall(Buffer.compare)');
eval('%OptimizeFunctionOnNextCall(b0.slice)');
eval('%OptimizeFunctionOnNextCall(b1.slice)');
Buffer.compare(b0.slice(1, len), b1.slice(1, len));
doCompareUsingSlice(b0, b1, len, iter);
}
function doCompareUsingSlice(b0, b1, len, iter) {
var i;
bench.start();
for (i = 0; i < iter; i++)
Buffer.compare(b0.slice(1, len), b1.slice(1, len));
bench.end(iter / 1e6);
}
function compareUsingOffset(b0, b1, len, iter) {
len = len + 1;
// Force optimization before starting the benchmark
b0.compare(b1, 1, len, 1, len);
v8.setFlagsFromString('--allow_natives_syntax');
eval('%OptimizeFunctionOnNextCall(b0.compare)');
b0.compare(b1, 1, len, 1, len);
doCompareUsingOffset(b0, b1, len, iter);
}
function doCompareUsingOffset(b0, b1, len, iter) {
var i;
bench.start();
for (i = 0; i < iter; i++)
b0.compare(b1, 1, len, 1, len);
bench.end(iter / 1e6);
}
function main(conf) {
const iter = (conf.millions >>> 0) * 1e6;
const size = (conf.size >>> 0);
const method = conf.method === 'slice' ?
compareUsingSlice : compareUsingOffset;
method(Buffer.alloc(size, 'a'),
Buffer.alloc(size, 'b'),
size >> 1,
iter);
}
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