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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++ } }) }
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