gcc/testsuite/gcc.dg/tree-ssa/popcount3.c


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/* { dg-do compile } */
/* { dg-require-effective-target popcountl } */
/* { dg-options "-O2 -fdump-tree-phiopt4 -fdump-tree-optimized" } */

int PopCount (long b) {
    int c = 0;

    while (b) {
	b &= b - 1;
	c++;
    }
    return c;
}

/* { dg-final { scan-tree-dump-times "__builtin_popcount|\\.POPCOUNT" 1 "optimized" } } */
/* { dg-final { scan-tree-dump-times "if" 0 "phiopt4" } } */