gnupic: improved banksel and pagsel
Subject:
Re: improved banksel and pagsel
From:
"Gabor Kiss [Bitman]" ####@####.####
Date:
23 Sep 2004 12:03:06 +0100
Message-Id: <Pine.LNX.4.58.0409231253310.12723@nelson.cdata.hu>
> The banksel and pagesel directives in gputils have been improved for 12
> bit and 14 bit devices. Before the directives manipulated all the bits
> for 4 banks and 4 pages. Now they only manipulate the bits for the
> pages and banks available on that device.
Dear Craig,
Is it possible to make some compile time optimizations with banksel?
Now I had to write tricky macros that keeps current select bits
in mind and changes the only the bits really necessary when I select
a bank. (I.e. switching from bank0 to bank1 requires 1 "bsf" instruction only.)
Yes, it is trivial, that principally there is no universal solution.
However even a limited version of banksel optimizer could
reduce code size and increase speed by omitting unnecessary
bit set/clear instructions at the expense of final code size
could not be strictly planned.
What is your opinion?
Cheers
Gabor
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