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
5package bytealg
6
7import "internal/cpu"
8
9const MaxBruteForce = 64
10
11func init() {
12	// Note: we're kind of lucky that this flag is available at this point.
13	// The runtime sets HasVX when processing auxv records, and that happens
14	// to happen *before* running the init functions of packages that
15	// the runtime depends on.
16	// TODO: it would really be nicer for internal/cpu to figure out this
17	// flag by itself. Then we wouldn't need to depend on quirks of
18	// early startup initialization order.
19	if cpu.S390X.HasVX {
20		MaxLen = 64
21	}
22}
23
24// Cutover reports the number of failures of IndexByte we should tolerate
25// before switching over to Index.
26// n is the number of bytes processed so far.
27// See the bytes.Index implementation for details.
28func Cutover(n int) int {
29	// 1 error per 8 characters, plus a few slop to start.
30	return (n + 16) / 8
31}
32