| /* { dg-do compile } */ |
| /* { dg-require-effective-target popcountll } */ |
| /* { dg-options "-O2 -fdump-tree-optimized" } */ |
| |
| const unsigned long long m1 = 0x5555555555555555ULL; |
| const unsigned long long m2 = 0x3333333333333333ULL; |
| const unsigned long long m4 = 0x0F0F0F0F0F0F0F0FULL; |
| const unsigned long long h01 = 0x0101010101010101ULL; |
| const int shift = 56; |
| |
| int popcount64c(unsigned long long x) |
| { |
| x -= (x >> 1) & m1; |
| x = (x & m2) + ((x >> 2) & m2); |
| x = (x + (x >> 4)) & m4; |
| return (x * h01) >> shift; |
| } |
| |
| /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 1 "optimized" { target { lp64 } } } } */ |
| /* { dg-final { scan-tree-dump-times "\.POPCOUNT" 2 "optimized" { target { ! lp64 } } } } */ |
