From: Josh Bleecher Snyder <josharian@gmail.com>
Date: Mon, 11 Apr 2016 18:54:07 +0000 (-0700)
Subject: image/color: add YCbCrToRGB benchmark
X-Git-Tag: go1.7beta1~768
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=7166dfe0c11bd25b962d7f691ea1be857842dfbf;p=gostls13.git

image/color: add YCbCrToRGB benchmark

Change-Id: I9ba76d5b0861a901415fdceccaf2f5caa2facb7f
Reviewed-on: https://go-review.googlesource.com/21837
Run-TryBot: Josh Bleecher Snyder <josharian@gmail.com>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
---

diff --git a/src/image/color/ycbcr_test.go b/src/image/color/ycbcr_test.go
index f5e7cbf335..1b110691a2 100644
--- a/src/image/color/ycbcr_test.go
+++ b/src/image/color/ycbcr_test.go
@@ -171,3 +171,26 @@ func TestPalette(t *testing.T) {
 		t.Errorf("got %v, want %v", got, want)
 	}
 }
+
+var sinkr, sinkg, sinkb uint8
+
+func BenchmarkYCbCrToRGB(b *testing.B) {
+	// YCbCrToRGB does saturating arithmetic.
+	// Low, middle, and high values can take
+	// different paths through the generated code.
+	b.Run("0", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			sinkr, sinkg, sinkb = YCbCrToRGB(0, 0, 0)
+		}
+	})
+	b.Run("128", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			sinkr, sinkg, sinkb = YCbCrToRGB(128, 128, 128)
+		}
+	})
+	b.Run("255", func(b *testing.B) {
+		for i := 0; i < b.N; i++ {
+			sinkr, sinkg, sinkb = YCbCrToRGB(255, 255, 255)
+		}
+	})
+}