index_arm64.go

     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  // Empirical data shows that using Index can get better
     8  // performance when len(s) <= 16.
     9  const MaxBruteForce = 16
    10  
    11  func init() {
    12  	// Optimize cases where the length of the substring is less than 32 bytes
    13  	MaxLen = 32
    14  }
    15  
    16  // Cutover reports the number of failures of IndexByte we should tolerate
    17  // before switching over to Index.
    18  // n is the number of bytes processed so far.
    19  // See the bytes.Index implementation for details.
    20  func Cutover(n int) int {
    21  	// 1 error per 16 characters, plus a few slop to start.
    22  	return 4 + n>>4
    23  }
    24
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