github.com/bir3/gocompiler@v0.9.2202/src/internal/bytealg/index_amd64.go (about) 1 // Copyright 2018 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package bytealg 6 7 import "github.com/bir3/gocompiler/src/internal/cpu" 8 9 const MaxBruteForce = 64 10 11 func init() { 12 if cpu.X86.HasAVX2 { 13 MaxLen = 63 14 } else { 15 MaxLen = 31 16 } 17 } 18 19 // Cutover reports the number of failures of IndexByte we should tolerate 20 // before switching over to Index. 21 // n is the number of bytes processed so far. 22 // See the bytes.Index implementation for details. 23 func Cutover(n int) int { 24 // 1 error per 8 characters, plus a few slop to start. 25 return (n + 16) / 8 26 }