On 4/15/10 8:29 AM, Igor Stasenko wrote:
> On 15 April 2010 05:54, Andreas Raab<andreas.raab at gmx.de>  wrote:
>> On 4/14/2010 1:08 PM, Juan Vuletich wrote:
>>> Profiling is indeed your friend.
>>> There is some serious inefficiency there. Quickly hacking this (warning:
>>> will only work for 1bpp):
>> [... snip ...]
>>
>>> gives over 30x speed increase (from 10 seconds down to 310 mSec) on my
>>> system. This is not a solution, just some food for thought.
>> Heh, heh. Very good. But now I'm gonna get serious ...
>>
>> <pokerface on>
>>
>> I see your 30x improvement and raise you another ... 6x for a total of 200x
>> speedup (from 10secs to 50 msecs). There! Take that! :-)
>>
>> (but if Igor pulls out some asm I may have to fold :-)
>>
> Yeah.. one could use MMX/SSE/SIMD instructions which will put on the
> knees anything you can write
> in C, not mentioning smalltalk :)

And now things come full circle. I recall reading an ancient article 
about someone who used bitblt as a hardware accelerated matrix multiply 
(or somesuch) back in the day.

Lawson
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