gcc/testsuite/gcc.dg/optimize-bswapdi-2.c

   1 /* { dg-do compile } */
   2 /* { dg-require-effective-target bswap } */
   3 /* { dg-require-effective-target stdint_types } */
   4 /* { dg-options "-O2 -fdump-tree-bswap" } */
   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 "64 bit bswap implementation found at" 1 "bswap" } } */