Add benchmark for TypedArray.prototype.set

Add benchmark for TypedArray.prototype.set when
setting from another TypedArray with the same type.

Bug: v8:6704
Change-Id: Ibde60b17aa32fb9c8237b2ab766d2b2913e256d7
Reviewed-on: https://chromium-review.googlesource.com/613264Reviewed-by: Benedikt Meurer <bmeurer@chromium.org>
Commit-Queue: Franziska Hinkelmann <franzih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#47342}

src/js/typedarray.js

@@ -317,6 +317,7 @@ function TypedArraySetFromOverlappingTypedArray(target, source, offset) {
   }
 }
 
+// 22.2.3.23%TypedArray%.prototype.set ( overloaded [ , offset ] )
 DEFINE_METHOD_LEN(
   GlobalTypedArray.prototype,
   set(obj, offset) {
@@ -328,7 +329,7 @@ DEFINE_METHOD_LEN(
     }
 
     switch (%TypedArraySetFastCases(this, obj, intOffset)) {
-      // These numbers should be synchronized with runtime.cc.
+      // These numbers should be synchronized with runtime-typedarray.cc.
       case 0: // TYPED_ARRAY_SET_TYPED_ARRAY_SAME_TYPE
         return;
       case 1: // TYPED_ARRAY_SET_TYPED_ARRAY_OVERLAPPING

test/js-perf-test/JSTests.json

@@ -331,6 +331,12 @@
           "resources": ["construct-all-typedarrays.js"],
           "test_flags": ["construct-all-typedarrays"]
         },
+        {
+          "name": "SetFromSameType",
+          "main": "run.js",
+          "resources": ["set-from-same-type.js"],
+          "test_flags": ["set-from-same-type"]
+        },
         {
           "name": "Sort",
           "main": "run.js",

test/js-perf-test/TypedArrays/set-from-same-type.js

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+new BenchmarkSuite('SetFromSameType', [1000], [
+  new Benchmark('SetFromSameType', false, false, 0, SetFromSameType),
+]);
+
+let src = [1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4, 1, 2, 3, 4];
+
+
+let typed_src = new Float32Array(src);
+let typed_dest = new Float32Array(16);
+
+function SetFromSameType() {
+  typed_dest.set(typed_src);
+}