fork download 
  1. #include <stdint.h>
  2.  
  3. #define DIVIDE_ITER_0_6(i) \
  4. "    lsl %D[n]\n" \
  5. "    rol %A[p]\n" \
  6. "    cp %A[p],%A[d]\n" \
  7. "    cpc %B[p],%B[d]\n" \
  8. "    cpc %C[p],%C[d]\n" \
  9. "    cpc %D[p],%D[d]\n" \
  10. "    brcs zero_bit_" #i "__%=\n" \
  11. "    sub %A[p],%A[d]\n" \
  12. "    or %D[q],__tmp_reg__\n" \
  13. "zero_bit_" #i "__%=:\n" \
  14. "    lsr __tmp_reg__\n"
  15.  
  16. #define DIVIDE_ITER_7_7(i) \
  17. "    lsl %D[n]\n" \
  18. "    rol %A[p]\n" \
  19. "    cp %A[p],%A[d]\n" \
  20. "    cpc %B[p],%B[d]\n" \
  21. "    cpc %C[p],%C[d]\n" \
  22. "    cpc %D[p],%D[d]\n" \
  23. "    brcs zero_bit_" #i "__%=\n" \
  24. "    sub %A[p],%A[d]\n" \
  25. "    or %D[q],__tmp_reg__\n" \
  26. "zero_bit_" #i "__%=:\n" \
  27. "    mov __tmp_reg__,%A[q]\n"
  28.  
  29. #define DIVIDE_ITER_8_14(i) \
  30. "    lsl %C[n]\n" \
  31. "    rol %A[p]\n" \
  32. "    rol %B[p]\n" \
  33. "    cp %A[p],%A[d]\n" \
  34. "    cpc %B[p],%B[d]\n" \
  35. "    cpc %C[p],%C[d]\n" \
  36. "    cpc %D[p],%D[d]\n" \
  37. "    brcs zero_bit_" #i "__%=\n" \
  38. "    sub %A[p],%A[d]\n" \
  39. "    sbc %B[p],%B[d]\n" \
  40. "    or %C[q],__tmp_reg__\n" \
  41. "zero_bit_" #i "__%=:\n" \
  42. "    lsr __tmp_reg__\n"
  43.  
  44. #define DIVIDE_ITER_15_15(i) \
  45. "    lsl %C[n]\n" \
  46. "    rol %A[p]\n" \
  47. "    rol %B[p]\n" \
  48. "    cp %A[p],%A[d]\n" \
  49. "    cpc %B[p],%B[d]\n" \
  50. "    cpc %C[p],%C[d]\n" \
  51. "    cpc %D[p],%D[d]\n" \
  52. "    brcs zero_bit_" #i "__%=\n" \
  53. "    sub %A[p],%A[d]\n" \
  54. "    sbc %B[p],%B[d]\n" \
  55. "    or %C[q],__tmp_reg__\n" \
  56. "zero_bit_" #i "__%=:\n" \
  57. "    mov __tmp_reg__,%A[q]\n"
  58.  
  59. #define DIVIDE_ITER_16_22(i) \
  60. "    lsl %B[n]\n" \
  61. "    rol %A[p]\n" \
  62. "    rol %B[p]\n" \
  63. "    rol %C[p]\n" \
  64. "    cp %A[p],%A[d]\n" \
  65. "    cpc %B[p],%B[d]\n" \
  66. "    cpc %C[p],%C[d]\n" \
  67. "    cpc %D[p],%D[d]\n" \
  68. "    brcs zero_bit_" #i "__%=\n" \
  69. "    sub %A[p],%A[d]\n" \
  70. "    sbc %B[p],%B[d]\n" \
  71. "    sbc %C[p],%C[d]\n" \
  72. "    or %B[q],__tmp_reg__\n" \
  73. "zero_bit_" #i "__%=:\n" \
  74. "    lsr __tmp_reg__\n"
  75.  
  76. #define DIVIDE_ITER_23_23(i) \
  77. "    lsl %B[n]\n" \
  78. "    rol %A[p]\n" \
  79. "    rol %B[p]\n" \
  80. "    rol %C[p]\n" \
  81. "    cp %A[p],%A[d]\n" \
  82. "    cpc %B[p],%B[d]\n" \
  83. "    cpc %C[p],%C[d]\n" \
  84. "    cpc %D[p],%D[d]\n" \
  85. "    brcs zero_bit_" #i "__%=\n" \
  86. "    sub %A[p],%A[d]\n" \
  87. "    sbc %B[p],%B[d]\n" \
  88. "    sbc %C[p],%C[d]\n" \
  89. "    or %B[q],__tmp_reg__\n" \
  90. "zero_bit_" #i "__%=:\n" \
  91. "    mov __tmp_reg__,%A[q]\n" \
  92. "    clr %A[q]\n"
  93.  
  94. #define DIVIDE_ITER_24_29(i) \
  95. "    lsl %A[n]\n" \
  96. "    rol %A[p]\n" \
  97. "    rol %B[p]\n" \
  98. "    rol %C[p]\n" \
  99. "    rol %D[p]\n" \
  100. "    cp %A[p],%A[d]\n" \
  101. "    cpc %B[p],%B[d]\n" \
  102. "    cpc %C[p],%C[d]\n" \
  103. "    cpc %D[p],%D[d]\n" \
  104. "    brcs zero_bit_" #i "__%=\n" \
  105. "    sub %A[p],%A[d]\n" \
  106. "    sbc %B[p],%B[d]\n" \
  107. "    sbc %C[p],%C[d]\n" \
  108. "    sbc %D[p],%D[d]\n" \
  109. "    or %A[q],__tmp_reg__\n" \
  110. "zero_bit_" #i "__%=:\n" \
  111. "    lsr __tmp_reg__\n"
  112.  
  113. #define DIVIDE_ITER_30_30(i) \
  114. "    lsl %A[n]\n" \
  115. "    rol %A[p]\n" \
  116. "    rol %B[p]\n" \
  117. "    rol %C[p]\n" \
  118. "    rol %D[p]\n" \
  119. "    cp %A[p],%A[d]\n" \
  120. "    cpc %B[p],%B[d]\n" \
  121. "    cpc %C[p],%C[d]\n" \
  122. "    cpc %D[p],%D[d]\n" \
  123. "    brcs zero_bit_" #i "__%=\n" \
  124. "    sub %A[p],%A[d]\n" \
  125. "    sbc %B[p],%B[d]\n" \
  126. "    sbc %C[p],%C[d]\n" \
  127. "    sbc %D[p],%D[d]\n" \
  128. "    or %A[q],__tmp_reg__\n" \
  129. "zero_bit_" #i "__%=:\n" \
  130.  
  131. uint32_t div_mine (uint32_t n, uint32_t d)
  132. {
  133.     uint32_t p = 0;
  134.     uint32_t q = 0x80;
  135.  
  136.     __asm__(
  137.         "    mov __tmp_reg__,%A[q]\n"
  138.         DIVIDE_ITER_0_6(0)
  139.         DIVIDE_ITER_0_6(1)
  140.         DIVIDE_ITER_0_6(2)
  141.         DIVIDE_ITER_0_6(3)
  142.         DIVIDE_ITER_0_6(4)
  143.         DIVIDE_ITER_0_6(5)
  144.         DIVIDE_ITER_0_6(6)
  145.         DIVIDE_ITER_7_7(7)
  146.         DIVIDE_ITER_8_14(8)
  147.         DIVIDE_ITER_8_14(9)
  148.         DIVIDE_ITER_8_14(10)
  149.         DIVIDE_ITER_8_14(11)
  150.         DIVIDE_ITER_8_14(12)
  151.         DIVIDE_ITER_8_14(13)
  152.         DIVIDE_ITER_8_14(14)
  153.         DIVIDE_ITER_15_15(15)
  154.         DIVIDE_ITER_16_22(16)
  155.         DIVIDE_ITER_16_22(17)
  156.         DIVIDE_ITER_16_22(18)
  157.         DIVIDE_ITER_16_22(19)
  158.         DIVIDE_ITER_16_22(20)
  159.         DIVIDE_ITER_16_22(21)
  160.         DIVIDE_ITER_16_22(22)
  161.         DIVIDE_ITER_23_23(23)
  162.         DIVIDE_ITER_24_29(24)
  163.         DIVIDE_ITER_24_29(25)
  164.         DIVIDE_ITER_24_29(26)
  165.         DIVIDE_ITER_24_29(27)
  166.         DIVIDE_ITER_24_29(28)
  167.         DIVIDE_ITER_24_29(29)
  168.         DIVIDE_ITER_30_30(30)
  169.         "    lsl %A[n]\n"
  170.         "    rol %A[p]\n"
  171.         "    rol %B[p]\n"
  172.         "    rol %C[p]\n"
  173.         "    rol %D[p]\n"
  174.         "    cp %A[p],%A[d]\n"
  175.         "    cpc %B[p],%B[d]\n"
  176.         "    cpc %C[p],%C[d]\n"
  177.         "    cpc %D[p],%D[d]\n"
  178.         "    brcs end_zero_bit_%=\n"
  179.         "    inc %A[q]\n"
  180.         "end_zero_bit_%=:\n"
  181.  
  182.         : [p] "=&r" (p),
  183.           [q] "=&r" (q),
  184.           [n] "=&r" (n)
  185.         : "[p]" (p),
  186.           "[q]" (q),
  187.           "[n]" (n),
  188.           [d] "r" (d)
  189.     );
  190.  
  191.     return q;
  192. }
  193.  
Not running #stdin #stdout 0s 0KB
comments (?)
stdin 
Standard input is empty
stdout 
Standard output is empty
https://ideone.com/6i2yd3
language:
C (gcc 8.3)
created:
10 years ago
visibility:
public

Share or Embed source code

Discover > Sphere Engine API

The brand new service which powers Ideone!

Discover > IDE Widget

Widget for compiling and running the source code in a web browser!