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Simply always defining BITS_PER_LONG as 64 seems like it's almost certainly wrong on 32-bit platforms and could potentially result in incorrect results. fls and, e.g., __builtin_ffs() return the same answer for any given input, making it seem like the name fls (find last set) is a misnomer and ffs (find first set, starting from the lsb) is the more accurate name. Using __builtin_ffs() causes the compiler (in intel) to emit code with the bsf (bit scan forward) insn, which is approx 3x faster than the code in ffs(), at least on the machine I tried it on. (Even so, it takes 10M+ iterations for the speed difference to be measurable. Choosing the "faster" implementation seems like a no-brainer, even if there may not be any significant gain by doing so.) Change-Id: I1616dda1a5b76f208ba737a713877c1673131e33 Signed-off-by: Kaleb S. KEITHLEY <kkeithle@redhat.com> Reviewed-on: https://review.gluster.org/17142 Smoke: Gluster Build System <jenkins@build.gluster.org> NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org> CentOS-regression: Gluster Build System <jenkins@build.gluster.org> Reviewed-by: Niels de Vos <ndevos@redhat.com> Reviewed-by: Jeff Darcy <jeff@pl.atyp.us>
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