Source file src/pkg/hash/crc32/crc32_amd64.go
1 // Copyright 2011 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 crc32 6 7 // This file contains the code to call the SSE 4.2 version of the Castagnoli 8 // CRC. 9 10 // haveSSE42 is defined in crc_amd64.s and uses CPUID to test for SSE 4.2 11 // support. 12 func haveSSE42() bool 13 14 // castagnoliSSE42 is defined in crc_amd64.s and uses the SSE4.2 CRC32 15 // instruction. 16 func castagnoliSSE42(uint32, []byte) uint32 17 18 var sse42 = haveSSE42() 19 20 func updateCastagnoli(crc uint32, p []byte) uint32 { 21 if sse42 { 22 return castagnoliSSE42(crc, p) 23 } 24 return update(crc, castagnoliTable, p) 25 }