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bit operation instructions
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These are especially useful to be used in the Linux kernel in asm/bitops.h to
define the functions named correspondingly in Linux.

The following instructions are provided in the .vhd file named accordingly:

ffs
        find first (least-significat) set bit in a 32bit word
ffz
        find first (least-significat) zero bit in a 32bit word
fls
        find last (most-significant) set bit in a 32bit word
hweight
        hamming weight of a 32bit word