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  1. #include <stdio.h>
  2. #include <inttypes.h>
  3. #include <string.h>
  4.  
  5. void uintprint3(uint32_t *a)
  6. {
  7.   printf("%u %u %u\n", a[0], a[1], a[2]);
  8. }
  9.  
  10. void sort3(uint32_t a[static 3])
  11. {
  12.   uint16_t mask = 0x6124;
  13.   uint8_t bits = (a[0] <= a[1]) | ((a[1] <= a[2]) << 1) | ((a[0] <= a[2]) << 2);
  14.   static const uint8_t b[] =
  15.   {
  16.     [0b000] =  3, // =0
  17.     [0b001] =  8,
  18.     [0b010] = 10,
  19.     [0b101] =  2, // =5
  20.     [0b110] =  1, // =4
  21.     [0b111] = 12,
  22.   };
  23.   mask >>= b[bits];
  24.   uint32_t tmp[3] = {a[(mask>>4)&0b11], a[(mask>>2)&0b11], a[(mask)&0b11]};
  25.   memcpy(a, tmp, 3*sizeof(uint32_t));
  26. }
  27.  
  28. int main(void)
  29. {
  30.   uint32_t a[] = {0, 1, 2};
  31.   uint32_t b[] = {0, 2, 1};
  32.   uint32_t c[] = {1, 2, 0};
  33.   uint32_t d[] = {1, 0, 2};
  34.   uint32_t e[] = {2, 0, 1};
  35.   uint32_t f[] = {2, 1, 0};
  36.   sort3(a); sort3(b); sort3(c); sort3(d); sort3(e); sort3(f);
  37.  
  38.   uintprint3(a);
  39.   uintprint3(b);
  40.   uintprint3(c);
  41.   uintprint3(d);
  42.   uintprint3(e);
  43.   uintprint3(f);
  44.   return 0;
  45. }
  46.  
Success #stdin #stdout 0s 9424KB
comments (?)
stdin
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Standard input is empty
stdout
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0 1 2
0 1 2
0 1 2
0 1 2
0 1 2
0 1 2
https://ideone.com/OTt0wH
language:
C (gcc 8.3)
created:
7 years ago
visibility:
public

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