golang index_amd64 代码
文件路径：/src/internal/bytealg/index_amd64.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.
package bytealg
import "internal/cpu"
const MaxBruteForce = 64
func init() {
if cpu.X86.HasAVX2 {
MaxLen = 63
} else {
MaxLen = 31
}
}
/ Cutover reports the number of failures of IndexByte we should tolerate
/ before switching over to Index.
/ n is the number of bytes processed so far.
/ See the bytes.Index implementation for details.
func Cutover(n int) int {
/ 1 error per 8 characters, plus a few slop to start.
return (n + 16) / 8
}