crc32_amd64p32.go 1.1 KB

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  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. // +build !appengine,!gccgo
  5. package crc32
  6. // This file contains the code to call the SSE 4.2 version of the Castagnoli
  7. // CRC.
  8. // haveSSE42 is defined in crc32_amd64p32.s and uses CPUID to test for SSE 4.2
  9. // support.
  10. func haveSSE42() bool
  11. // castagnoliSSE42 is defined in crc32_amd64p32.s and uses the SSE4.2 CRC32
  12. // instruction.
  13. //go:noescape
  14. func castagnoliSSE42(crc uint32, p []byte) uint32
  15. var sse42 = haveSSE42()
  16. func archAvailableCastagnoli() bool {
  17. return sse42
  18. }
  19. func archInitCastagnoli() {
  20. if !sse42 {
  21. panic("not available")
  22. }
  23. // No initialization necessary.
  24. }
  25. func archUpdateCastagnoli(crc uint32, p []byte) uint32 {
  26. if !sse42 {
  27. panic("not available")
  28. }
  29. return castagnoliSSE42(crc, p)
  30. }
  31. func archAvailableIEEE() bool { return false }
  32. func archInitIEEE() { panic("not available") }
  33. func archUpdateIEEE(crc uint32, p []byte) uint32 { panic("not available") }