Bit blit routine, version 1

[Brian Hurt]

On 3 Feb 2004, Torbjorn Granlund wrote:

> Please explain what you mean with bit-blit.
> 
> We have mpn_lshift and mpn_rshift already in GMP, and they
> are carefully optimized for all relevant processors.  They
> implement what I mean with bit-blit.
> 
> In what way is your code different from mpn_lshift and mpn_rshift?
> 
> 

My bitblit is a generalization of shift left/shift right routines.  I 
forget what the problems I had were, but when I looked into doing rotates 
with the current implementation of the shifts, I hit problems.

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Brian