1  /* { dg-do compile } */
       2  /* { dg-require-effective-target bswap } */
       3  /* { dg-require-effective-target stdint_types } */
       4  /* { dg-options "-O2 -fdump-tree-optimized" } */
       5  /* { dg-additional-options "-mzarch" { target s390*-*-* } } */
       6  
       7  #include <stdint.h>
       8  
       9  /* A variant via unsigned short.  */
      10  
      11  uint64_t
      12  swap64_c (uint64_t x)
      13  {
      14    uint16_t a0 = x >> 48;
      15    uint16_t a1 = x >> 32;
      16    uint16_t a2 = x >> 16;
      17    uint16_t a3 = x;
      18  
      19    return ((uint64_t) (((a0 >> 8) & 0xff) | ((a0 << 8) & 0xff00)))
      20  	| ((uint64_t) (((a1 >> 8) & 0xff) | ((a1 << 8) & 0xff00)) << 16)
      21  	| ((uint64_t) (((a2 >> 8) & 0xff) | ((a2 << 8) & 0xff00)) << 32)
      22  	| ((uint64_t) (((a3 >> 8) & 0xff) | ((a3 << 8) & 0xff00)) << 48);
      23  }
      24  
      25  
      26  /* { dg-final { scan-tree-dump-times "= __builtin_bswap64 \\\(" 1 "optimized" } } */