gcc/testsuite/gcc.dg/tree-ssa/popcount5l.c

   1 /* PR tree-optimization/94800 */
   2 /* { dg-do compile { target int32plus } } */
   3 /* { dg-require-effective-target popcountl } */
   4 /* { dg-options "-O2 -fdump-tree-optimized" } */
   5
   6 #if __SIZEOF_LONG__ == 4
   7 const unsigned long m1  = 0x55555555UL;
   8 const unsigned long m2  = 0x33333333UL;
   9 const unsigned long m4  = 0x0F0F0F0FUL;
  10 const int shift = 24;
  11 #else
  12 const unsigned long m1  = 0x5555555555555555UL;
  13 const unsigned long m2  = 0x3333333333333333UL;
  14 const unsigned long m4  = 0x0f0f0f0f0f0f0f0fUL;
  15 const int shift = 56;
  16 #endif
  17
  18
  19 int popcount64c(unsigned long x)
  20 {
  21     x -= (x >> 1) & m1;
  22     x = (x & m2) + ((x >> 2) & m2);
  23     x = (x + (x >> 4)) & m4;
  24     x += (x << 8);
  25     x += (x << 16);
  26 #if __SIZEOF_LONG__ != 4
  27     x += (x << 32);
  28 #endif
  29     return x >> shift;
  30 }
  31
  32 /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 1 "optimized" } } */