Source file src/pkg/hash/crc32/crc32_amd64p32.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	import "internal/cpu"
     8	
     9	// This file contains the code to call the SSE 4.2 version of the Castagnoli
    10	// CRC.
    11	
    12	// castagnoliSSE42 is defined in crc32_amd64p32.s and uses the SSE4.2 CRC32
    13	// instruction.
    14	//go:noescape
    15	func castagnoliSSE42(crc uint32, p []byte) uint32
    16	
    17	func archAvailableCastagnoli() bool {
    18		return cpu.X86.HasSSE42
    19	}
    20	
    21	func archInitCastagnoli() {
    22		if !cpu.X86.HasSSE42 {
    23			panic("not available")
    24		}
    25		// No initialization necessary.
    26	}
    27	
    28	func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
    29		if !cpu.X86.HasSSE42 {
    30			panic("not available")
    31		}
    32		return castagnoliSSE42(crc, p)
    33	}
    34	
    35	func archAvailableIEEE() bool                    { return false }
    36	func archInitIEEE()                              { panic("not available") }
    37	func archUpdateIEEE(crc uint32, p []byte) uint32 { panic("not available") }
    38	

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