gcc/testsuite/gcc.dg/pr43280.c

   1 /* { dg-do run } */
   2 /* { dg-require-effective-target stdint_types } */
   3 /* { dg-options "-O2" } */
   4
   5 #include <stdint.h>
   6
   7 extern void abort (void);
   8
   9 uint64_t __attribute__((noinline))
  10 byteswap64(uint64_t x)
  11 {
  12   uint32_t a = x >> 32;
  13   uint32_t b = (uint32_t) x;
  14   return ((uint64_t) ((((((b)) >> (8)) | (((b)) << (32 - (8)))) & 0xff00ff00L)
  15                       | (((((b)) << (8)) | (((b)) >> (32 - (8)))) & 0x00ff00ffL)) << 32)
  16           | (uint64_t) ((((((a)) >> (8)) | (((a)) << (32 - (8)))) & 0xff00ff00L)
  17                         | (((((a)) << (8)) | (((a)) >> (32 - (8)))) & 0x00ff00ffL));
  18 }
  19
  20 int
  21 main ()
  22 {
  23   uint64_t in = (uint64_t)0x01020304 << 32 | 0x05060708;
  24   uint64_t cmp = (uint64_t)0x08070605 << 32 | 0x04030201;
  25
  26   if (cmp != byteswap64 (in))
  27     abort ();
  28
  29   return 0;
  30 }