hash/crc32: use sub-benchmarks

Change-Id: Iae68a097a6897f1616f94fdc3548837ef200e66f
Reviewed-on: https://go-review.googlesource.com/36541
Run-TryBot: Russ Cox <rsc@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Joe Tsai <thebrokentoaster@gmail.com>

src/hash/crc32/crc32_test.go

@@ -5,6 +5,7 @@
 package crc32
 
 import (
+	"fmt"
 	"hash"
 	"math/rand"
 	"testing"
@@ -196,68 +197,28 @@ func TestGolden(t *testing.T) {
 	}
 }
 
-func BenchmarkIEEECrc40B(b *testing.B) {
-	benchmark(b, NewIEEE(), 40, 0)
+func BenchmarkCRC32(b *testing.B) {
+	b.Run("poly=IEEE", benchmarkAll(NewIEEE()))
+	b.Run("poly=Castagnoli", benchmarkAll(New(MakeTable(Castagnoli))))
+	b.Run("poly=Koopman", benchmarkAll(New(MakeTable(Koopman))))
 }
 
-func BenchmarkIEEECrc1KB(b *testing.B) {
-	benchmark(b, NewIEEE(), 1<<10, 0)
-}
-
-func BenchmarkIEEECrc4KB(b *testing.B) {
-	benchmark(b, NewIEEE(), 4<<10, 0)
-}
-
-func BenchmarkIEEECrc32KB(b *testing.B) {
-	benchmark(b, NewIEEE(), 32<<10, 0)
-}
-
-func BenchmarkCastagnoliCrc15B(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 15, 0)
-}
-
-func BenchmarkCastagnoliCrc15BMisaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 15, 1)
-}
-
-func BenchmarkCastagnoliCrc40B(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 40, 0)
-}
-
-func BenchmarkCastagnoliCrc40BMisaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 40, 1)
-}
-
-func BenchmarkCastagnoliCrc512(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 512, 0)
-}
-
-func BenchmarkCastagnoliCrc512Misaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 512, 1)
-}
-
-func BenchmarkCastagnoliCrc1KB(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 1<<10, 0)
-}
-
-func BenchmarkCastagnoliCrc1KBMisaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 1<<10, 1)
-}
-
-func BenchmarkCastagnoliCrc4KB(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 4<<10, 0)
-}
-
-func BenchmarkCastagnoliCrc4KBMisaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 4<<10, 1)
-}
-
-func BenchmarkCastagnoliCrc32KB(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 32<<10, 0)
-}
-
-func BenchmarkCastagnoliCrc32KBMisaligned(b *testing.B) {
-	benchmark(b, New(MakeTable(Castagnoli)), 32<<10, 1)
+func benchmarkAll(h hash.Hash32) func(b *testing.B) {
+	return func(b *testing.B) {
+		for _, size := range []int{15, 40, 512, 1 << 10, 4 << 10, 32 << 10} {
+			name := fmt.Sprint(size)
+			if size >= 1024 {
+				name = fmt.Sprintf("%dkB", size/1024)
+			}
+			b.Run("size="+name, func(b *testing.B) {
+				for align := 0; align <= 1; align++ {
+					b.Run(fmt.Sprintf("align=%d", align), func(b *testing.B) {
+						benchmark(b, h, int64(size), int64(align))
+					})
+				}
+			})
+		}
+	}
 }
 
 func benchmark(b *testing.B, h hash.Hash32, n, alignment int64) {