gcc/testsuite/gcc.c-torture/execute/bswap-1.c

   1 /* Test __builtin_bswap64 . */
   2
   3 unsigned long long g(unsigned long long a) __attribute__((noinline));
   4 unsigned long long g(unsigned long long a)
   5 {
   6   return __builtin_bswap64(a);
   7 }
   8
   9
  10 unsigned long long f(unsigned long long c)
  11 {
  12   union {
  13     unsigned long long a;
  14     unsigned char b[8];
  15   } a, b;
  16   a.a = c;
  17   b.b[0] = a.b[7];
  18   b.b[1] = a.b[6];
  19   b.b[2] = a.b[5];
  20   b.b[3] = a.b[4];
  21   b.b[4] = a.b[3];
  22   b.b[5] = a.b[2];
  23   b.b[6] = a.b[1];
  24   b.b[7] = a.b[0];
  25   return b.a;
  26 }
  27
  28 int main(void)
  29 {
  30   unsigned long long i;
  31   /* The rest of the testcase assumes 8 byte long long. */
  32   if (sizeof(i) != sizeof(char)*8)
  33     return 0;
  34   if (f(0x12) != g(0x12))
  35     __builtin_abort();
  36   if (f(0x1234) != g(0x1234))
  37     __builtin_abort();
  38   if (f(0x123456) != g(0x123456))
  39     __builtin_abort();
  40   if (f(0x12345678ull) != g(0x12345678ull))
  41     __builtin_abort();
  42   if (f(0x1234567890ull) != g(0x1234567890ull))
  43     __builtin_abort();
  44   if (f(0x123456789012ull) != g(0x123456789012ull))
  45     __builtin_abort();
  46   if (f(0x12345678901234ull) != g(0x12345678901234ull))
  47     __builtin_abort();
  48   if (f(0x1234567890123456ull) != g(0x1234567890123456ull))
  49     __builtin_abort();
  50   return 0;
  51 }