gcc/testsuite/gcc.c-torture/execute/ffs-2.c

   1 struct
   2   {
   3     int input;
   4     int output;
   5   }
   6 ffstesttab[] =
   7   {
   8 #if __INT_MAX__ >= 2147483647
   9     /* at least 32-bit integers */
  10     { 0x80000000, 32 },
  11     { 0xa5a5a5a5, 1 },
  12     { 0x5a5a5a5a, 2 },
  13     { 0xcafe0000, 18 },
  14 #endif
  15 #if __INT_MAX__ >= 32767
  16     /* at least 16-bit integers */
  17     { 0x8000, 16 },
  18     { 0xa5a5, 1 },
  19     { 0x5a5a, 2 },
  20     { 0x0ca0, 6 },
  21 #endif
  22 #if __INT_MAX__ < 32767
  23 #error integers are too small
  24 #endif
  25   };
  26
  27 #define NFFSTESTS (sizeof (ffstesttab) / sizeof (ffstesttab[0]))
  28
  29 extern void abort (void);
  30 extern void exit (int);
  31
  32 int
  33 main (void)
  34 {
  35   int i;
  36
  37   for (i = 0; i < NFFSTESTS; i++)
  38     {
  39       if (__builtin_ffs (ffstesttab[i].input) != ffstesttab[i].output)
  40         abort ();
  41     }
  42
  43   exit (0);
  44 }