On Monday 15 June 2009, David Brownell wrote:
> Notice how Linux does it; the BIT_{MASK,WORD}() macros are simple bit
> ops (e.g. for 32 bits, MASK ands with 0x1f and WORD rightshifts 5).
That is
BITS_PER_UL = (8 * sizeof(unsigned long))
MASK == 1 << (val & ((1 << BITS_PER_UL) - 1))
WORD == val >> ilog2(BITS_PER_UL)
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