binutils-gdb/libiberty/ffs.c

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/* ffs -- Find the first bit set in the parameter
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@deftypefn Supplemental int ffs (int @var{valu})
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Find the first (least significant) bit set in @var{valu}. Bits are
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numbered from right to left, starting with bit 1 (corresponding to the
value 1). If @var{valu} is zero, zero is returned.
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@end deftypefn
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*/
int
ffs (valu)
register int valu;
{
register int bit;
if (valu == 0)
return 0;
for (bit = 1; !(valu & 1); bit++)
valu >>= 1;
return bit;
}