diff options
Diffstat (limited to 'src/pkg/hash/crc32/crc32_amd64.go')
-rw-r--r-- | src/pkg/hash/crc32/crc32_amd64.go | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/pkg/hash/crc32/crc32_amd64.go b/src/pkg/hash/crc32/crc32_amd64.go new file mode 100644 index 000000000..83349bc6c --- /dev/null +++ b/src/pkg/hash/crc32/crc32_amd64.go @@ -0,0 +1,25 @@ +// 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) +} |