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  1. unsigned step(unsigned state, unsigned mask, unsigned pos)
  2. {
  3.     unsigned bit1=(mask>>8)&1, bit2=(mask>>7)&1, bit3=(mask>>6)&1,
  4.              bit4=(mask>>5)&1, bit5=(mask>>4)&1, bit6=(mask>>3)&1,
  5.              bit7=(mask>>2)&1, bit8=(mask>>1)&1, bit9=(mask>>0)&1;
  6.     switch (pos)
  7.     {
  8.     case 1:
  9.         state^=bit5<<15;
  10.         state^=bit6<<14;
  11.         state^=bit8<<11;
  12.         state^=bit9<<10;
  13.         break;
  14.     case 2:
  15.         state^=bit4<<15;
  16.         state^=bit5<<14;
  17.         state^=bit6<<13;
  18.         state^=bit7<<11;
  19.         state^=bit8<<10;
  20.         state^=bit9<<9;
  21.         break;
  22.     case 3:
  23.         state^=bit4<<14;
  24.         state^=bit5<<13;
  25.         state^=bit6<<12;
  26.         state^=bit7<<10;
  27.         state^=bit8<<9;
  28.         state^=bit9<<8;
  29.         break;
  30.     case 4:
  31.         state^=bit4<<13;
  32.         state^=bit5<<12;
  33.         state^=bit7<<9;
  34.         state^=bit8<<8;
  35.         break;
  36.     case 5:
  37.         state^=bit2<<15;
  38.         state^=bit3<<14;
  39.         state^=bit5<<11;
  40.         state^=bit6<<10;
  41.         state^=bit8<<7;
  42.         state^=bit9<<6;
  43.         break;
  44.     case 6:
  45.         state^=bit1<<15;
  46.         state^=bit2<<14;
  47.         state^=bit3<<13;
  48.         state^=bit4<<11;
  49.         state^=bit5<<10;
  50.         state^=bit6<<9;
  51.         state^=bit7<<7;
  52.         state^=bit8<<6;
  53.         state^=bit9<<5;
  54.         break;
  55.     case 7:
  56.         state^=bit1<<14;
  57.         state^=bit2<<13;
  58.         state^=bit3<<12;
  59.         state^=bit4<<10;
  60.         state^=bit5<<9;
  61.         state^=bit6<<8;
  62.         state^=bit7<<6;
  63.         state^=bit8<<5;
  64.         state^=bit9<<4;
  65.         break;
  66.     case 8:
  67.         state^=bit1<<13;
  68.         state^=bit2<<12;
  69.         state^=bit4<<9;
  70.         state^=bit5<<8;
  71.         state^=bit7<<5;
  72.         state^=bit8<<4;
  73.         break;
  74.     case 9:
  75.         state^=bit2<<11;
  76.         state^=bit3<<10;
  77.         state^=bit5<<7;
  78.         state^=bit6<<6;
  79.         state^=bit8<<3;
  80.         state^=bit9<<2;
  81.         break;
  82.     case 10:
  83.         state^=bit1<<11;
  84.         state^=bit2<<10;
  85.         state^=bit3<<9;
  86.         state^=bit4<<7;
  87.         state^=bit5<<6;
  88.         state^=bit6<<5;
  89.         state^=bit7<<3;
  90.         state^=bit8<<2;
  91.         state^=bit9<<1;
  92.         break;
  93.     case 11:
  94.         state^=bit1<<10;
  95.         state^=bit2<<9;
  96.         state^=bit3<<8;
  97.         state^=bit4<<6;
  98.         state^=bit5<<5;
  99.         state^=bit6<<4;
  100.         state^=bit7<<2;
  101.         state^=bit8<<1;
  102.         state^=bit9<<0;
  103.         break;
  104.     case 12:
  105.         state^=bit1<<9;
  106.         state^=bit2<<8;
  107.         state^=bit4<<5;
  108.         state^=bit5<<4;
  109.         state^=bit7<<1;
  110.         state^=bit8<<0;
  111.         break;
  112.     case 13:
  113.         state^=bit2<<7;
  114.         state^=bit3<<6;
  115.         state^=bit5<<3;
  116.         state^=bit6<<2;
  117.         break;
  118.     case 14:
  119.         state^=bit1<<7;
  120.         state^=bit2<<6;
  121.         state^=bit3<<5;
  122.         state^=bit4<<3;
  123.         state^=bit5<<2;
  124.         state^=bit6<<1;
  125.         break;
  126.     case 15:
  127.         state^=bit1<<6;
  128.         state^=bit2<<5;
  129.         state^=bit3<<4;
  130.         state^=bit4<<2;
  131.         state^=bit5<<1;
  132.         state^=bit6<<0;
  133.         break;
  134.     case 16:
  135.         state^=bit1<<5;
  136.         state^=bit2<<4;
  137.         state^=bit4<<1;
  138.         state^=bit5<<0;
  139.         break;
  140.     }
  141.     return state;
  142. }
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https://ideone.com/w5JRRH
language:
Text (text 6.10)
created:
7 years ago
visibility:
secret

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