index_loong64.go

     1  // Copyright 2025 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 "internal/cpu"
     8  
     9  // Empirical data shows that using Index can get better
    10  // performance when len(s) <= 16.
    11  const MaxBruteForce = 16
    12  
    13  func init() {
    14  	// If SIMD is supported, optimize the cases where the substring length is less than 64 bytes,
    15  	// otherwise, cases the length less than 32 bytes is optimized.
    16  	if cpu.Loong64.HasLASX || cpu.Loong64.HasLSX {
    17  		MaxLen = 64
    18  	} else {
    19  		MaxLen = 32
    20  	}
    21  }
    22  
    23  // Cutover reports the number of failures of IndexByte we should tolerate
    24  // before switching over to Index.
    25  // n is the number of bytes processed so far.
    26  // See the bytes.Index implementation for details.
    27  func Cutover(n int) int {
    28  	// 1 error per 8 characters, plus a few slop to start.
    29  	return (n + 16) / 8
    30  }
    31
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