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tstcmn_test.go
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tstcmn_test.go
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// Copyright 2017 Ben Shi. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package go1
// This benchmark tests the performance of the comparason of x&y to 0 and x+y to 0.
// It shows improvement in https://go-review.googlesource.com/c/go/+/124935
import (
"testing"
)
var a0 int32
func init() {
a0 = 0
}
//go:noinline
func inc() {
a0++
}
//go:noinline
func tstcmn(a, b, c, d int64) {
if a&b > 0 {
inc()
}
if a+b > 0 {
inc()
}
if int32(a)+int32(b) > 0 {
inc()
}
if int32(a)&int32(b) > 0 {
inc()
}
if c&d > 0 {
inc()
}
if c+d > 0 {
inc()
}
if int32(c)+int32(d) > 0 {
inc()
}
if int32(c)&int32(d) > 0 {
inc()
}
}
func BenchmarkTSTCMN(b *testing.B) {
for i := 0; i < b.N; i++ {
for j := 0; j < 16384; j++ {
tstcmn(0, 0, 0, 0)
}
}
}