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  1. static uint32_t call (uint32_t n, uint32_t d)
  2. {
  3.     uint32_t p = 0;
  4.     uint32_t q = 0;
  5.     uint8_t ctr = 31;
  6.  
  7.     asm(
  8.         "next_iter%=:\n"
  9.         "    lsl %A[n]\n"
  10.         "    rol %B[n]\n"
  11.         "    rol %C[n]\n"
  12.         "    rol %D[n]\n"
  13.         "    rol %A[p]\n"
  14.         "    rol %B[p]\n"
  15.         "    rol %C[p]\n"
  16.         "    rol %D[p]\n"
  17.         "    cp %A[p],%A[d]\n"
  18.         "    cpc %B[p],%B[d]\n"
  19.         "    cpc %C[p],%C[d]\n"
  20.         "    cpc %D[p],%D[d]\n"
  21.         "    brcs zero_bit%=\n"
  22.         "    sub %A[p],%A[d]\n"
  23.         "    sbc %B[p],%B[d]\n"
  24.         "    sbc %C[p],%C[d]\n"
  25.         "    sbc %D[p],%D[d]\n"
  26.         "    inc %A[q]\n"
  27.         "zero_bit%=:\n"
  28.         "    lsl %A[q]\n"
  29.         "    rol %B[q]\n"
  30.         "    rol %C[q]\n"
  31.         "    rol %D[q]\n"
  32.         "    dec %[ctr]\n"
  33.         "    brcc next_iter%=\n"
  34.  
  35.         "    lsl %A[n]\n"
  36.         "    rol %B[n]\n"
  37.         "    rol %C[n]\n"
  38.         "    rol %D[n]\n"
  39.         "    rol %A[p]\n"
  40.         "    rol %B[p]\n"
  41.         "    rol %C[p]\n"
  42.         "    rol %D[p]\n"
  43.         "    cp %A[p],%A[d]\n"
  44.         "    cpc %B[p],%B[d]\n"
  45.         "    cpc %C[p],%C[d]\n"
  46.         "    cpc %D[p],%D[d]\n"
  47.         "    brcs end_zero_bit%=\n"
  48.         "    inc %A[q]\n"
  49.         "end_zero_bit%=:\n"
  50.  
  51.         : [p] "=&r" (p),
  52.           [q] "=&r" (q),
  53.           [n] "=&r" (n),
  54.           [ctr] "=&r" (ctr)
  55.         : "[p]" (p),
  56.           "[q]" (q),
  57.           "[n]" (n),
  58.           "[ctr]" (ctr),
  59.           [d] "r" (d)
  60.     );
  61.  
  62.     return q;
  63. }
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https://ideone.com/hJga7f
language:
C++ (gcc 8.3)
created:
10 years ago
visibility:
public

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