benchmark: improve buffer.readInt(B|L)E benchmarks

Split them into their own benhmark file and use different byteLength
values.

PR-URL: https://github.com/nodejs/node/pull/11146
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Joyee Cheung <joyeec9h3@gmail.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Michaël Zasso <targos@protonmail.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>

benchmark/buffers/buffer-read-with-byteLength.js

@@ -0,0 +1,34 @@
+'use strict';
+const common = require('../common.js');
+
+const types = [
+  'IntLE',
+  'IntBE',
+];
+
+const bench = common.createBenchmark(main, {
+  noAssert: ['false', 'true'],
+  buffer: ['fast', 'slow'],
+  type: types,
+  millions: [1],
+  byteLength: [1, 2, 4, 6]
+});
+
+function main(conf) {
+  const noAssert = conf.noAssert === 'true';
+  const len = conf.millions * 1e6;
+  const clazz = conf.buf === 'fast' ? Buffer : require('buffer').SlowBuffer;
+  const buff = new clazz(8);
+  const type = conf.type || 'UInt8';
+  const fn = `read${type}`;
+
+  buff.writeDoubleLE(0, 0, noAssert);
+  const testFunction = new Function('buff', `
+    for (var i = 0; i !== ${len}; i++) {
+      buff.${fn}(0, ${conf.byteLength}, ${JSON.stringify(noAssert)});
+    }
+  `);
+  bench.start();
+  testFunction(buff);
+  bench.end(len / 1e6);
+}

benchmark/buffers/buffer-read.js

@@ -15,9 +15,7 @@ const types = [
   'FloatLE',
   'FloatBE',
   'DoubleLE',
-  'DoubleBE',
-  'IntLE',
-  'IntBE',
+  'DoubleBE'
 ];
 
 const bench = common.createBenchmark(main, {
@@ -36,19 +34,11 @@ function main(conf) {
   const fn = `read${type}`;
 
   buff.writeDoubleLE(0, 0, noAssert);
-
-  var call;
-  if (fn === 'readIntLE' || fn === 'readIntBE') {
-    call = `buff.${fn}(0, 1, ${JSON.stringify(noAssert)})`;
-  } else {
-    call = `buff.${fn}(0, ${JSON.stringify(noAssert)})`;
-  }
-
-  const testFunction = new Function(
-    'buff',
-    `for (var i = 0; i !== ${len}; ++i) { ${call}; }`
-  );
-
+  const testFunction = new Function('buff', `
+    for (var i = 0; i !== ${len}; i++) {
+      buff.${fn}(0, ${JSON.stringify(noAssert)});
+    }
+  `);
   bench.start();
   testFunction(buff);
   bench.end(len / 1e6);

test/sequential/test-benchmark-buffer.js

@@ -9,7 +9,9 @@ runBenchmark('buffers',
                'aligned=true',
                'args=1',
                'buffer=fast',
+               'byteLength=1',
                'encoding=utf8',
+               'endian=BE',
                'len=2',
                'method=',
                'n=1',
@@ -20,6 +22,7 @@ runBenchmark('buffers',
                'size=1',
                'source=array',
                'type=',
+               'value=0',
                'withTotalLength=0'
              ],
              { NODEJS_BENCHMARK_ZERO_ALLOWED: 1 });