gcc/testsuite/gcc.dg/tree-ssa/popcount5ll.c

   1 /* PR tree-optimization/94800 */
   2 /* { dg-do compile } */
   3 /* { dg-require-effective-target popcountll } */
   4 /* { dg-options "-O2 -fdump-tree-optimized" } */
   5
   6 const unsigned long long m1  = 0x5555555555555555ULL;
   7 const unsigned long long m2  = 0x3333333333333333ULL;
   8 const unsigned long long m4  = 0x0F0F0F0F0F0F0F0FULL;
   9 const int shift = 56;
  10
  11 int popcount64c(unsigned long long x)
  12 {
  13     x -= (x >> 1) & m1;
  14     x = (x & m2) + ((x >> 2) & m2);
  15     x = (x + (x >> 4)) & m4;
  16     x += (x << 8);
  17     x += (x << 16);
  18     x += (x << 32);
  19     return x >> shift;
  20 }
  21
  22 /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 1 "optimized" { target { lp64 } } } } */
  23 /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 2 "optimized" { target { ! lp64 } } } } */