Answer Posted / intfail

all the above answers are wrong...
never use loops. immediate rejection

CopyBits(x, p, n, y)

First get n bits from pos p from Y

bitsFromy = y >> (p-n+1) & (~(~0<<n))

Now, get a mask such that we can 0 out bits in x at pos p and n bits to the right

startpos = p -n +1

create a mask from (startpos, p)
mask = (~0 << p - startpos +1)<<startpos | ~(~0 << startpos)

Now, 0 out the the bits in the locations (starpos, p) in x
and apply the bits extracted from y
x = (x & mask) | (bitsFromy << startpos)

that is all it takes.

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