libgo/go/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") }