gcc/testsuite/gcc.dg/builtin-bswap-7a.c

   1 /* { dg-do compile { target arm*-*-* alpha*-*-* ia64*-*-* i?86-*-* x86_64-*-* s390x-*-* powerpc*-*-* rs6000-*-* } } */
   2 /* { dg-require-effective-target stdint_types } */
   3 /* { dg-require-effective-target lp64 } */
   4 /* { dg-options "-O2 -fdump-rtl-combine" } */
   5
   6 /* The test is similiar to builtin-bswap-7.c but returns 1/2 instead
   7    of 0/1 to prevent GCC from calculating the return value with
   8    arithmetic instead of a comparison.  This requires the optimization
   9    level to be bumped up to -O2 at least for x86_64.  */
  10
  11 #include <stdint.h>
  12
  13 #define BS(X) __builtin_bswap64(X)
  14
  15 int foo1 (uint64_t a)
  16 {
  17   if (BS (a) == 0xA00000000)
  18     return 1;
  19   return 2;
  20 }
  21
  22 int foo2 (uint64_t a)
  23 {
  24   if (BS (a) != 0xA00000000)
  25     return 1;
  26   return 2;
  27 }
  28
  29 int foo3 (uint64_t a, uint64_t b)
  30 {
  31   if (BS (a) == BS (b))
  32     return 1;
  33   return 2;
  34 }
  35
  36 int foo4 (uint64_t a, uint64_t b)
  37 {
  38   if (BS (a) != BS (b))
  39     return 1;
  40   return 2;
  41 }
  42
  43 /* { dg-final { scan-rtl-dump-not "bswapdi" "combine" } } */