forked from Shiloh/githaven
44 lines
1.1 KiB
Go
44 lines
1.1 KiB
Go
// Copyright 2011 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 !appengine,!gccgo
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package crc32
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// This file contains the code to call the SSE 4.2 version of the Castagnoli
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// CRC.
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// haveSSE42 is defined in crc32_amd64p32.s and uses CPUID to test for SSE 4.2
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// support.
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func haveSSE42() bool
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// castagnoliSSE42 is defined in crc32_amd64p32.s and uses the SSE4.2 CRC32
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// instruction.
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//go:noescape
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func castagnoliSSE42(crc uint32, p []byte) uint32
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var sse42 = haveSSE42()
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func archAvailableCastagnoli() bool {
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return sse42
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}
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func archInitCastagnoli() {
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if !sse42 {
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panic("not available")
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}
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// No initialization necessary.
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}
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func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
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if !sse42 {
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panic("not available")
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}
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return castagnoliSSE42(crc, p)
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}
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func archAvailableIEEE() bool { return false }
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func archInitIEEE() { panic("not available") }
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func archUpdateIEEE(crc uint32, p []byte) uint32 { panic("not available") }
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