You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
44 lines
1.1 KiB
44 lines
1.1 KiB
8 years ago
|
// Copyright 2011 The Go Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSE file.
|
||
|
|
|
||
|
|
// +build !appengine,!gccgo
|
||
|
|
|
||
|
|
package crc32
|
||
|
|
|
||
|
|
// This file contains the code to call the SSE 4.2 version of the Castagnoli
|
||
|
|
// CRC.
|
||
|
|
|
||
|
|
// haveSSE42 is defined in crc32_amd64p32.s and uses CPUID to test for SSE 4.2
|
||
|
|
// support.
|
||
|
|
func haveSSE42() bool
|
||
|
|
|
||
|
|
// castagnoliSSE42 is defined in crc32_amd64p32.s and uses the SSE4.2 CRC32
|
||
|
|
// instruction.
|
||
|
|
//go:noescape
|
||
|
|
func castagnoliSSE42(crc uint32, p []byte) uint32
|
||
|
|
|
||
|
|
var sse42 = haveSSE42()
|
||
|
|
|
||
|
|
func archAvailableCastagnoli() bool {
|
||
|
|
return sse42
|
||
|
|
}
|
||
|
|
|
||
|
|
func archInitCastagnoli() {
|
||
|
|
if !sse42 {
|
||
|
|
panic("not available")
|
||
|
|
}
|
||
|
|
// No initialization necessary.
|
||
|
|
}
|
||
|
|
|
||
|
|
func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
|
||
|
|
if !sse42 {
|
||
|
|
panic("not available")
|
||
|
|
}
|
||
|
|
return castagnoliSSE42(crc, p)
|
||
|
|
}
|
||
|
|
|
||
|
|
func archAvailableIEEE() bool { return false }
|
||
|
|
func archInitIEEE() { panic("not available") }
|
||
|
|
func archUpdateIEEE(crc uint32, p []byte) uint32 { panic("not available") }
|