gcc/testsuite/gcc.dg/fold-popcount-6.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-optimized" } */
   3
   4 int foo(unsigned int x)
   5 {
   6 #if __SIZEOF_INT__ == 4
   7   return __builtin_popcount (__builtin_bswap32(x));
   8 #elif __SIZEOF_INT__ == 2
   9   return __builtin_popcount (__builtin_bswap16(x));
  10 #else
  11   return x;
  12 #endif
  13 }
  14
  15 int bar(unsigned long x)
  16 {
  17 #if __SIZEOF_LONG__ == 8
  18   return __builtin_popcountl (__builtin_bswap64(x));
  19 #elif __SIZEOF_LONG__ == 4
  20   return __builtin_popcountl (__builtin_bswap32(x));
  21 #else
  22   return x;
  23 #endif
  24 }
  25
  26 int baz(unsigned long long x)
  27 {
  28 #if __SIZEOF_LONG_LONG__ == 8
  29   return __builtin_popcountll (__builtin_bswap64(x));
  30 #elif __SIZEOF_LONG_LONG__ == 4
  31   return __builtin_popcountll (__builtin_bswap32(x));
  32 #else
  33   return x;
  34 #endif
  35 }
  36
  37 /* { dg-final { scan-tree-dump-not "bswap" "optimized" } } */