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/freebsd-9.3-release/sys/ia64/include/
H A Drunq.hdiff 123418 Wed Dec 10 20:47:02 MST 2003 peter Use ffs(x) == popcnt(x ^ (x - 1)) to implement 64 bit ffsl(). gcc's
ffs() builtin uses this already but truncates the upper 32 bits.

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