blob: 7abadf6df04fcc47405a4a611a1f9139f25cfc4b (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
|
/* { 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 } } } } */
|
