File: popcount4ll.c

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gcc-arm-none-eabi 15%3A14.2.rel1-1
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/* { 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 } } } } */