本站源代码
You can not select more than 25 topics Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.

60 lines
1.3KB

  1. // Copyright 2018 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 386 amd64 amd64p32
  5. package cpu
  6. const cacheLineSize = 64
  7. func init() {
  8. Initialized = true
  9. maxID, _, _, _ := cpuid(0, 0)
  10. if maxID < 1 {
  11. return
  12. }
  13. _, _, ecx1, edx1 := cpuid(1, 0)
  14. X86.HasSSE2 = isSet(26, edx1)
  15. X86.HasSSE3 = isSet(0, ecx1)
  16. X86.HasPCLMULQDQ = isSet(1, ecx1)
  17. X86.HasSSSE3 = isSet(9, ecx1)
  18. X86.HasFMA = isSet(12, ecx1)
  19. X86.HasSSE41 = isSet(19, ecx1)
  20. X86.HasSSE42 = isSet(20, ecx1)
  21. X86.HasPOPCNT = isSet(23, ecx1)
  22. X86.HasAES = isSet(25, ecx1)
  23. X86.HasOSXSAVE = isSet(27, ecx1)
  24. X86.HasRDRAND = isSet(30, ecx1)
  25. osSupportsAVX := false
  26. // For XGETBV, OSXSAVE bit is required and sufficient.
  27. if X86.HasOSXSAVE {
  28. eax, _ := xgetbv()
  29. // Check if XMM and YMM registers have OS support.
  30. osSupportsAVX = isSet(1, eax) && isSet(2, eax)
  31. }
  32. X86.HasAVX = isSet(28, ecx1) && osSupportsAVX
  33. if maxID < 7 {
  34. return
  35. }
  36. _, ebx7, _, _ := cpuid(7, 0)
  37. X86.HasBMI1 = isSet(3, ebx7)
  38. X86.HasAVX2 = isSet(5, ebx7) && osSupportsAVX
  39. X86.HasBMI2 = isSet(8, ebx7)
  40. X86.HasERMS = isSet(9, ebx7)
  41. X86.HasRDSEED = isSet(18, ebx7)
  42. X86.HasADX = isSet(19, ebx7)
  43. }
  44. func isSet(bitpos uint, value uint32) bool {
  45. return value&(1<<bitpos) != 0
  46. }
上海开阖软件有限公司 沪ICP备12045867号-1