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// Copyright 2023 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.
// TODO(61395): move these tests to atomic_test.go once And/Or have
// implementations for all architectures.
package atomic_test
import (
"runtime/internal/atomic"
"testing"
)
func TestAnd32(t *testing.T) {
// Basic sanity check.
x := uint32(0xffffffff)
for i := uint32(0); i < 32; i++ {
old := x
v := atomic.And32(&x, ^(1 << i))
if r := uint32(0xffffffff) << (i + 1); x != r || v != old {
t.Fatalf("clearing bit %#x: want %#x, got new %#x and old %#v", uint32(1<<i), r, x, v)
}
}
// Set every bit in array to 1.
a := make([]uint32, 1<<12)
for i := range a {
a[i] = 0xffffffff
}
// Clear array bit-by-bit in different goroutines.
done := make(chan bool)
for i := 0; i < 32; i++ {
m := ^uint32(1 << i)
go func() {
for i := range a {
atomic.And(&a[i], m)
}
done <- true
}()
}
for i := 0; i < 32; i++ {
<-done
}
// Check that the array has been totally cleared.
for i, v := range a {
if v != 0 {
t.Fatalf("a[%v] not cleared: want %#x, got %#x", i, uint32(0), v)
}
}
}
func TestAnd64(t *testing.T) {
// Basic sanity check.
x := uint64(0xffffffffffffffff)
for i := uint64(0); i < 64; i++ {
old := x
v := atomic.And64(&x, ^(1 << i))
if r := uint64(0xffffffffffffffff) << (i + 1); x != r || v != old {
t.Fatalf("clearing bit %#x: want %#x, got new %#x and old %#v", uint64(1<<i), r, x, v)
}
}
// Set every bit in array to 1.
a := make([]uint64, 1<<12)
for i := range a {
a[i] = 0xffffffffffffffff
}
// Clear array bit-by-bit in different goroutines.
done := make(chan bool)
for i := 0; i < 64; i++ {
m := ^uint64(1 << i)
go func() {
for i := range a {
atomic.And64(&a[i], m)
}
done <- true
}()
}
for i := 0; i < 64; i++ {
<-done
}
// Check that the array has been totally cleared.
for i, v := range a {
if v != 0 {
t.Fatalf("a[%v] not cleared: want %#x, got %#x", i, uint64(0), v)
}
}
}
func TestOr32(t *testing.T) {
// Basic sanity check.
x := uint32(0)
for i := uint32(0); i < 32; i++ {
old := x
v := atomic.Or32(&x, 1<<i)
if r := (uint32(1) << (i + 1)) - 1; x != r || v != old {
t.Fatalf("setting bit %#x: want %#x, got new %#x and old %#v", uint32(1<<i), r, x, v)
}
}
// Start with every bit in array set to 0.
a := make([]uint32, 1<<12)
// Set every bit in array bit-by-bit in different goroutines.
done := make(chan bool)
for i := 0; i < 32; i++ {
m := uint32(1 << i)
go func() {
for i := range a {
atomic.Or32(&a[i], m)
}
done <- true
}()
}
for i := 0; i < 32; i++ {
<-done
}
// Check that the array has been totally set.
for i, v := range a {
if v != 0xffffffff {
t.Fatalf("a[%v] not fully set: want %#x, got %#x", i, uint32(0xffffffff), v)
}
}
}
func TestOr64(t *testing.T) {
// Basic sanity check.
x := uint64(0)
for i := uint64(0); i < 64; i++ {
old := x
v := atomic.Or64(&x, 1<<i)
if r := (uint64(1) << (i + 1)) - 1; x != r || v != old {
t.Fatalf("setting bit %#x: want %#x, got new %#x and old %#v", uint64(1<<i), r, x, v)
}
}
// Start with every bit in array set to 0.
a := make([]uint64, 1<<12)
// Set every bit in array bit-by-bit in different goroutines.
done := make(chan bool)
for i := 0; i < 64; i++ {
m := uint64(1 << i)
go func() {
for i := range a {
atomic.Or64(&a[i], m)
}
done <- true
}()
}
for i := 0; i < 64; i++ {
<-done
}
// Check that the array has been totally set.
for i, v := range a {
if v != 0xffffffffffffffff {
t.Fatalf("a[%v] not fully set: want %#x, got %#x", i, uint64(0xffffffffffffffff), v)
}
}
}
func BenchmarkAnd32(b *testing.B) {
var x [128]uint32 // give x its own cache line
sink = &x
for i := 0; i < b.N; i++ {
atomic.And32(&x[63], uint32(i))
}
}
func BenchmarkAnd32Parallel(b *testing.B) {
var x [128]uint32 // give x its own cache line
sink = &x
b.RunParallel(func(pb *testing.PB) {
i := uint32(0)
for pb.Next() {
atomic.And32(&x[63], i)
i++
}
})
}
func BenchmarkAnd64(b *testing.B) {
var x [128]uint64 // give x its own cache line
sink = &x
for i := 0; i < b.N; i++ {
atomic.And64(&x[63], uint64(i))
}
}
func BenchmarkAnd64Parallel(b *testing.B) {
var x [128]uint64 // give x its own cache line
sink = &x
b.RunParallel(func(pb *testing.PB) {
i := uint64(0)
for pb.Next() {
atomic.And64(&x[63], i)
i++
}
})
}
func BenchmarkOr32(b *testing.B) {
var x [128]uint32 // give x its own cache line
sink = &x
for i := 0; i < b.N; i++ {
atomic.Or32(&x[63], uint32(i))
}
}
func BenchmarkOr32Parallel(b *testing.B) {
var x [128]uint32 // give x its own cache line
sink = &x
b.RunParallel(func(pb *testing.PB) {
i := uint32(0)
for pb.Next() {
atomic.Or32(&x[63], i)
i++
}
})
}
func BenchmarkOr64(b *testing.B) {
var x [128]uint64 // give x its own cache line
sink = &x
for i := 0; i < b.N; i++ {
atomic.Or64(&x[63], uint64(i))
}
}
func BenchmarkOr64Parallel(b *testing.B) {
var x [128]uint64 // give x its own cache line
sink = &x
b.RunParallel(func(pb *testing.PB) {
i := uint64(0)
for pb.Next() {
atomic.Or64(&x[63], i)
i++
}
})
}