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go/src/runtime/vlop_arm_test.go

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runtime: add arm soft division and modulo benchmarks arm soft div and mod performance plays an important part in runtime performance. The currently implementation is very stable, but we believe we can best it. This benchmark provides a reference point. linux/arm omap4 pandaboard BenchmarkUint32Div7 10000000 298 ns/op BenchmarkUint32Div37 10000000 298 ns/op BenchmarkUint32Div123 10000000 298 ns/op BenchmarkUint32Div763 10000000 298 ns/op BenchmarkUint32Div1247 10000000 299 ns/op BenchmarkUint32Div9305 10000000 298 ns/op BenchmarkUint32Div13307 10000000 298 ns/op BenchmarkUint32Div52513 10000000 298 ns/op BenchmarkUint32Div60978747 10000000 298 ns/op BenchmarkUint32Div106956295 10000000 297 ns/op BenchmarkUint32Mod7 10000000 280 ns/op BenchmarkUint32Mod37 10000000 280 ns/op BenchmarkUint32Mod123 10000000 280 ns/op BenchmarkUint32Mod763 10000000 280 ns/op BenchmarkUint32Mod1247 10000000 280 ns/op BenchmarkUint32Mod9305 10000000 280 ns/op BenchmarkUint32Mod13307 10000000 280 ns/op BenchmarkUint32Mod52513 10000000 280 ns/op BenchmarkUint32Mod60978747 10000000 280 ns/op BenchmarkUint32Mod106956295 10000000 280 ns/op R=minux.ma, rsc CC=golang-dev https://golang.org/cl/6258067
2012-06-25 16:58:00 -06:00
// Copyright 2012 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime_test
import "testing"
gofmt: apply gofmt -w src misc Remove trailing whitespace in comments. No other changes. R=r CC=golang-dev https://golang.org/cl/6815053
2012-10-30 14:38:01 -06:00
// arm soft division benchmarks adapted from
runtime: add arm soft division and modulo benchmarks arm soft div and mod performance plays an important part in runtime performance. The currently implementation is very stable, but we believe we can best it. This benchmark provides a reference point. linux/arm omap4 pandaboard BenchmarkUint32Div7 10000000 298 ns/op BenchmarkUint32Div37 10000000 298 ns/op BenchmarkUint32Div123 10000000 298 ns/op BenchmarkUint32Div763 10000000 298 ns/op BenchmarkUint32Div1247 10000000 299 ns/op BenchmarkUint32Div9305 10000000 298 ns/op BenchmarkUint32Div13307 10000000 298 ns/op BenchmarkUint32Div52513 10000000 298 ns/op BenchmarkUint32Div60978747 10000000 298 ns/op BenchmarkUint32Div106956295 10000000 297 ns/op BenchmarkUint32Mod7 10000000 280 ns/op BenchmarkUint32Mod37 10000000 280 ns/op BenchmarkUint32Mod123 10000000 280 ns/op BenchmarkUint32Mod763 10000000 280 ns/op BenchmarkUint32Mod1247 10000000 280 ns/op BenchmarkUint32Mod9305 10000000 280 ns/op BenchmarkUint32Mod13307 10000000 280 ns/op BenchmarkUint32Mod52513 10000000 280 ns/op BenchmarkUint32Mod60978747 10000000 280 ns/op BenchmarkUint32Mod106956295 10000000 280 ns/op R=minux.ma, rsc CC=golang-dev https://golang.org/cl/6258067
2012-06-25 16:58:00 -06:00
// http://ridiculousfish.com/files/division_benchmarks.tar.gz
const numeratorsSize = 1 << 21
var numerators = randomNumerators()
type randstate struct {
hi, lo uint32
}
func (r *randstate) rand() uint32 {
r.hi = r.hi<<16 + r.hi>>16
r.hi += r.lo
r.lo += r.hi
return r.hi
}
func randomNumerators() []uint32 {
numerators := make([]uint32, numeratorsSize)
random := &randstate{2147483563, 2147483563 ^ 0x49616E42}
for i := range numerators {
numerators[i] = random.rand()
}
return numerators
}
func bmUint32Div(divisor uint32, b *testing.B) {
var sum uint32
for i := 0; i < b.N; i++ {
sum += numerators[i&(numeratorsSize-1)] / divisor
}
}
func BenchmarkUint32Div7(b *testing.B) { bmUint32Div(7, b) }
func BenchmarkUint32Div37(b *testing.B) { bmUint32Div(37, b) }
func BenchmarkUint32Div123(b *testing.B) { bmUint32Div(123, b) }
func BenchmarkUint32Div763(b *testing.B) { bmUint32Div(763, b) }
func BenchmarkUint32Div1247(b *testing.B) { bmUint32Div(1247, b) }
func BenchmarkUint32Div9305(b *testing.B) { bmUint32Div(9305, b) }
func BenchmarkUint32Div13307(b *testing.B) { bmUint32Div(13307, b) }
func BenchmarkUint32Div52513(b *testing.B) { bmUint32Div(52513, b) }
func BenchmarkUint32Div60978747(b *testing.B) { bmUint32Div(60978747, b) }
func BenchmarkUint32Div106956295(b *testing.B) { bmUint32Div(106956295, b) }
func bmUint32Mod(divisor uint32, b *testing.B) {
var sum uint32
for i := 0; i < b.N; i++ {
sum += numerators[i&(numeratorsSize-1)] % divisor
}
}
func BenchmarkUint32Mod7(b *testing.B) { bmUint32Mod(7, b) }
func BenchmarkUint32Mod37(b *testing.B) { bmUint32Mod(37, b) }
func BenchmarkUint32Mod123(b *testing.B) { bmUint32Mod(123, b) }
func BenchmarkUint32Mod763(b *testing.B) { bmUint32Mod(763, b) }
func BenchmarkUint32Mod1247(b *testing.B) { bmUint32Mod(1247, b) }
func BenchmarkUint32Mod9305(b *testing.B) { bmUint32Mod(9305, b) }
func BenchmarkUint32Mod13307(b *testing.B) { bmUint32Mod(13307, b) }
func BenchmarkUint32Mod52513(b *testing.B) { bmUint32Mod(52513, b) }
func BenchmarkUint32Mod60978747(b *testing.B) { bmUint32Mod(60978747, b) }
func BenchmarkUint32Mod106956295(b *testing.B) { bmUint32Mod(106956295, b) }
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