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Programming > Assembly x86 > Re: MMX speedup...
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Re: MMX speedup for Floyd Steinberg error diffusion

by rep_movsd <spamtrap@[EMAIL PROTECTED] > May 8, 2008 at 07:23 AM

I figured it out...

I do all my processing in the form of 4 signed WORDS in the MMX
registers, and finally I use packuswb which takes the 4 and packs them
into unsigned bytes with saturation.

The code works exactly as my C++ version did and I have a speedup of
more than 2X !! :)

Excellent!

Thanks all




 26 Posts in Topic:
MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-05 04:04:14 
Re: MMX speedup for Floyd Steinberg error diffusion
 "Maarten Kronenburg&  2008-05-07 19:56:39 
Re: MMX speedup for Floyd Steinberg error diffusion
 "Maarten Kronenburg&  2008-05-07 20:49:56 
Re: MMX speedup for Floyd Steinberg error diffusion
 "Maarten Kronenburg&  2008-05-07 22:35:41 
Re: MMX speedup for Floyd Steinberg error diffusion
 James Harris <spamtra  2008-05-07 16:26:13 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-08 00:57:41 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-08 18:00:18 
Re: MMX speedup for Floyd Steinberg error diffusion
 "Maarten Kronenburg&  2008-05-08 17:14:21 
Re: MMX speedup for Floyd Steinberg error diffusion
 Robert Redelmeier <red  2008-05-09 14:19:08 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-09 21:03:11 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-08 07:23:41 
Re: MMX speedup for Floyd Steinberg error diffusion
 Jim Leonard <spamtrap  2008-05-08 13:48:14 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-09 10:21:40 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-09 00:24:23 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-09 15:31:53 
Re: MMX speedup for Floyd Steinberg error diffusion
 Phil Carmody <thefatph  2008-05-09 17:18:44 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-09 21:03:09 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-10 00:28:25 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-10 21:25:29 
Re: MMX speedup for Floyd Steinberg error diffusion
 Phil Carmody <thefatph  2008-05-10 22:48:49 
Re: MMX speedup for Floyd Steinberg error diffusion
 Phil Carmody <thefatph  2008-05-10 22:07:04 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-10 02:28:42 
Re: MMX speedup for Floyd Steinberg error diffusion
 Terje Mathisen <spamt  2008-05-10 21:17:34 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-11 01:33:13 
Re: MMX speedup for Floyd Steinberg error diffusion
 Phil Carmody <thefatph  2008-05-11 13:14:37 
Re: MMX speedup for Floyd Steinberg error diffusion
 rep_movsd <spamtrap@[  2008-05-11 01:25:56 

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tan12V112 Sun Jul 6 20:17:53 CDT 2008.