golang compare_generic 代码
文件路径：/src/internal/bytealg/compare_generic.go
// Copyright 2018 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.
//go:build !386 && !amd64 && !s390x && !arm && !arm64 && !loong64 && !ppc64 && !ppc64le && !mips && !mipsle && !wasm && !mips64 && !mips64le && !riscv64
package bytealg
import _ "unsafe" // for go:linkname
func Compare(a, b []byte) int {
l := len(a)
if len(b) < l {
l = len(b)
}
if l == 0 || &a[0] == &b[0] {
goto samebytes
}
for i := 0; i < l; i++ {
c1, c2 := a[i], b[i]
if c1 < c2 {
return -1
}
if c1 > c2 {
return +1
}
}
samebytes:
if len(a) < len(b) {
return -1
}
if len(a) > len(b) {
return +1
}
return 0
}
//go:linkname runtime_cmpstring runtime.cmpstring
func runtime_cmpstring(a, b string) int {
l := len(a)
if len(b) < l {
l = len(b)
}
for i := 0; i < l; i++ {
c1, c2 := a[i], b[i]
if c1 < c2 {
return -1
}
if c1 > c2 {
return +1
}
}
if len(a) < len(b) {
return -1
}
if len(a) > len(b) {
return +1
}
return 0
}