go align_test 源码
golang align_test 代码
文件路径：/src/cmd/compile/internal/test/align_test.go
// Copyright 2021 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.
// Test to make sure that equality functions (and hash
// functions) don't do unaligned reads on architectures
// that can't do unaligned reads. See issue 46283.
package test
import "testing"
type T1 struct {
x float32
a, b, c, d int16 // memequal64
}
type T2 struct {
x float32
a, b, c, d int32 // memequal128
}
type A2 [2]byte // eq uses a 2-byte load
type A4 [4]byte // eq uses a 4-byte load
type A8 [8]byte // eq uses an 8-byte load
//go:noinline
func cmpT1(p, q *T1) {
if *p != *q {
panic("comparison test wrong")
}
}
//go:noinline
func cmpT2(p, q *T2) {
if *p != *q {
panic("comparison test wrong")
}
}
//go:noinline
func cmpA2(p, q *A2) {
if *p != *q {
panic("comparison test wrong")
}
}
//go:noinline
func cmpA4(p, q *A4) {
if *p != *q {
panic("comparison test wrong")
}
}
//go:noinline
func cmpA8(p, q *A8) {
if *p != *q {
panic("comparison test wrong")
}
}
func TestAlignEqual(t *testing.T) {
cmpT1(&T1{}, &T1{})
cmpT2(&T2{}, &T2{})
m1 := map[T1]bool{}
m1[T1{}] = true
m1[T1{}] = false
if len(m1) != 1 {
t.Fatalf("len(m1)=%d, want 1", len(m1))
}
m2 := map[T2]bool{}
m2[T2{}] = true
m2[T2{}] = false
if len(m2) != 1 {
t.Fatalf("len(m2)=%d, want 1", len(m2))
}
type X2 struct {
y byte
z A2
}
var x2 X2
cmpA2(&x2.z, &A2{})
type X4 struct {
y byte
z A4
}
var x4 X4
cmpA4(&x4.z, &A4{})
type X8 struct {
y byte
z A8
}
var x8 X8
cmpA8(&x8.z, &A8{})
}
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