buffer: improve equals() performance

PR-URL: https://github.com/nodejs/node/pull/29199
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Yongsheng Zhang <zyszys98@gmail.com>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>

1 files changed, 22 insertions, 0 deletions

diff --git a/benchmark/buffers/buffer-equals.js b/benchmark/buffers/buffer-equals.js
new file mode 100644
index 00000000000..99d2472bd3a
--- /dev/null
+++ b/benchmark/buffers/buffer-equals.js
@@ -0,0 +1,22 @@
+'use strict';
+const common = require('../common.js');
+
+const bench = common.createBenchmark(main, {
+  size: [0, 512, 16386],
+  difflen: ['true', 'false'],
+  n: [1e6]
+});
+
+function main({ n, size, difflen }) {
+  const b0 = Buffer.alloc(size, 'a');
+  const b1 = Buffer.alloc(size + (difflen === 'true' ? 1 : 0), 'a');
+
+  if (b1.length > 0)
+    b1[b1.length - 1] = 'b'.charCodeAt(0);
+
+  bench.start();
+  for (let i = 0; i < n; i++) {
+    b0.equals(b1);
+  }
+  bench.end(n);
+}