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// 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.

package crc32

// This file contains the code to call the SSE 4.2 version of the Castagnoli

// CRC.

// haveSSE42 is defined in crc_amd64.s and uses CPUID to test for SSE 4.2

// support.

func haveSSE42() bool

// castagnoliSSE42 is defined in crc_amd64.s and uses the SSE4.2 CRC32

// instruction.

func castagnoliSSE42(uint32, []byte) uint32

var sse42 = haveSSE42()

func updateCastagnoli(crc uint32, p []byte) uint32 {

        if sse42 {

                return castagnoliSSE42(crc, p)

        }

        return update(crc, castagnoliTable, p)

}