1a2f01efa6
Update the Go library to the 1.10beta1 release.
Requires a few changes to the compiler for modifications to the map
runtime code, and to handle some nowritebarrier cases in the runtime.
Reviewed-on: https://go-review.googlesource.com/86455
gotools/:
* Makefile.am (go_cmd_vet_files): New variable.
(go_cmd_buildid_files, go_cmd_test2json_files): New variables.
(s-zdefaultcc): Change from constants to functions.
(noinst_PROGRAMS): Add vet, buildid, and test2json.
(cgo$(EXEEXT)): Link against $(LIBGOTOOL).
(vet$(EXEEXT)): New target.
(buildid$(EXEEXT)): New target.
(test2json$(EXEEXT)): New target.
(install-exec-local): Install all $(noinst_PROGRAMS).
(uninstall-local): Uninstasll all $(noinst_PROGRAMS).
(check-go-tool): Depend on $(noinst_PROGRAMS). Copy down
objabi.go.
(check-runtime): Depend on $(noinst_PROGRAMS).
(check-cgo-test, check-carchive-test): Likewise.
(check-vet): New target.
(check): Depend on check-vet. Look at cmd_vet-testlog.
(.PHONY): Add check-vet.
* Makefile.in: Rebuild.
From-SVN: r256365
91 lines
2.0 KiB
Go
91 lines
2.0 KiB
Go
// Copyright 2016 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// +build ignore
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package bytes
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import "internal/cpu"
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//go:noescape
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// indexShortStr returns the index of the first instance of c in s, or -1 if c is not present in s.
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// indexShortStr requires 2 <= len(c) <= shortStringLen
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func indexShortStr(s, c []byte) int // ../runtime/asm_amd64.s
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func countByte(s []byte, c byte) int // ../runtime/asm_amd64.s
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var shortStringLen int
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func init() {
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if cpu.X86.HasAVX2 {
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shortStringLen = 63
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} else {
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shortStringLen = 31
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}
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}
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// Index returns the index of the first instance of sep in s, or -1 if sep is not present in s.
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func Index(s, sep []byte) int {
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n := len(sep)
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switch {
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case n == 0:
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return 0
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case n == 1:
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return IndexByte(s, sep[0])
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case n == len(s):
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if Equal(sep, s) {
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return 0
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}
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return -1
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case n > len(s):
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return -1
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case n <= shortStringLen:
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// Use brute force when s and sep both are small
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if len(s) <= 64 {
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return indexShortStr(s, sep)
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}
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c := sep[0]
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i := 0
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t := s[:len(s)-n+1]
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fails := 0
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for i < len(t) {
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if t[i] != c {
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// IndexByte skips 16/32 bytes per iteration,
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// so it's faster than indexShortStr.
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o := IndexByte(t[i:], c)
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if o < 0 {
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return -1
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}
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i += o
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}
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if Equal(s[i:i+n], sep) {
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return i
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}
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fails++
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i++
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// Switch to indexShortStr when IndexByte produces too many false positives.
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// Too many means more that 1 error per 8 characters.
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// Allow some errors in the beginning.
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if fails > (i+16)/8 {
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r := indexShortStr(s[i:], sep)
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if r >= 0 {
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return r + i
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}
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return -1
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}
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}
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return -1
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}
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return indexRabinKarp(s, sep)
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}
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// Count counts the number of non-overlapping instances of sep in s.
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// If sep is an empty slice, Count returns 1 + the number of UTF-8-encoded code points in s.
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func Count(s, sep []byte) int {
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if len(sep) == 1 && cpu.X86.HasPOPCNT {
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return countByte(s, sep[0])
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}
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return countGeneric(s, sep)
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}
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