go index_amd64 源码
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
}
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