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cpu_feat.nas

cpu_feat.nas 1.8 KB
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  1. ;
    2. 

  2. ;
    3. 

  3. ; 	assembler routines to detect CPU-features
    4. 

  4. ;
    5. 

  5. ;	MMX / 3DNow! / SSE / SSE2
    6. 

  6. ;
    7. 

  7. ;	for the LAME project
    8. 

  8. ;	Frank Klemm, Robert Hegemann 2000-10-12
    9. 

  9. ;
    10. 

  10. 

  11. %include "nasm.h"
    12. 

  12. 

  13. 	globaldef	has_MMX_nasm
    14. 

  14. 	globaldef	has_3DNow_nasm
    15. 

  15. 	globaldef	has_SSE_nasm
    16. 

  16. 	globaldef	has_SSE2_nasm
    17. 

  17. 

  18.         segment_code
    19. 

  19. 

  20. testCPUID:
    21. 

  21. 	pushfd	                        
    22. 

  22. 	pop	eax
    23. 

  23. 	mov	ecx,eax
    24. 

  24. 	xor	eax,0x200000
    25. 

  25. 	push	eax
    26. 

  26. 	popfd
    27. 

  27. 	pushfd
    28. 

  28. 	pop	eax
    29. 

  29. 	cmp	eax,ecx
    30. 

  30. 	ret
    31. 

  31. 

  32. ;---------------------------------------
    33. 

  33. ;	int  has_MMX_nasm (void)
    34. 

  34. ;---------------------------------------
    35. 

  35. 

  36. has_MMX_nasm:
    37. 

  37.         pushad
    38. 

  38. 	call	testCPUID
    39. 

  39. 	jz	return0		; no CPUID command, so no MMX
    40. 

  40. 

  41. 	mov	eax,0x1
    42. 

  42. 	CPUID
    43. 

  43. 	test	edx,0x800000
    44. 

  44. 	jz	return0		; no MMX support
    45. 

  45. 	jmp	return1		; MMX support
    46. 

  46.         
    47. 

  47. ;---------------------------------------
    48. 

  48. ;	int  has_SSE_nasm (void)
    49. 

  49. ;---------------------------------------
    50. 

  50. 

  51. has_SSE_nasm:
    52. 

  52.         pushad
    53. 

  53. 	call	testCPUID
    54. 

  54. 	jz	return0		; no CPUID command, so no SSE
    55. 

  55.         
    56. 

  56. 	mov	eax,0x1
    57. 

  57. 	CPUID
    58. 

  58. 	test	edx,0x02000000
    59. 

  59. 	jz	return0		; no SSE support
    60. 

  60. 	jmp	return1		; SSE support
    61. 

  61.         
    62. 

  62. ;---------------------------------------
    63. 

  63. ;	int  has_SSE2_nasm (void)
    64. 

  64. ;---------------------------------------
    65. 

  65. 

  66. has_SSE2_nasm:
    67. 

  67.         pushad
    68. 

  68. 	call	testCPUID
    69. 

  69. 	jz	return0		; no CPUID command, so no SSE2
    70. 

  70.         
    71. 

  71. 	mov	eax,0x1
    72. 

  72. 	CPUID
    73. 

  73. 	test	edx,0x04000000
    74. 

  74. 	jz	return0		; no SSE2 support
    75. 

  75. 	jmp	return1		; SSE2 support
    76. 

  76.         
    77. 

  77. ;---------------------------------------
    78. 

  78. ;	int  has_3DNow_nasm (void)
    79. 

  79. ;---------------------------------------
    80. 

  80. 

  81. has_3DNow_nasm:
    82. 

  82.         pushad
    83. 

  83. 	call	testCPUID
    84. 

  84. 	jz	return0		; no CPUID command, so no 3DNow!
    85. 

  85. 

  86. 	mov	eax,0x80000000
    87. 

  87. 	CPUID
    88. 

  88. 	cmp	eax,0x80000000
    89. 

  89. 	jbe	return0		; no extended MSR(1), so no 3DNow!
    90. 

  90. 

  91. 	mov	eax,0x80000001
    92. 

  92. 	CPUID
    93. 

  93. 	test	edx,0x80000000
    94. 

  94. 	jz	return0		; no 3DNow! support
    95. 

  95. 				; 3DNow! support
    96. 

  96. return1:
    97. 

  97. 	popad
    98. 

  98. 	xor	eax,eax
    99. 

  99. 	inc	eax
    100. 

  100. 	ret
    101. 

  101. 

  102. return0:
    103. 

  103. 	popad
    104. 

  104. 	xor	eax,eax
    105. 

  105. 	ret
    106. 

  106.         
    107. 

  107.         end
    108.