Date: Tue, 19 Aug 2003 17:57:00 +0200 From: Stephane Marchesin Subject: Re: [SDL] [patch] MMX alpha blit patches with MMX detection I think everything is correct now. I've done as much testing as I could, but some real-world testing wouldn't hurt, I think. The patch is here : http://icps.u-strasbg.fr/~marchesin/sdl_mmxblit.patch If you do byte-by-byte comparison of the output between C and MMX functions, you'll notice that the results for 555 and 565 RGB alpha blits aren't exactly the same. This is because MMX functions for 555 and 565 RGB have an higher accuracy. If you want the exact same behaviour that's possible by masking the three lower alpha bits in the MMX functions. Just ask ! I removed one MMX function because after I fixed it to match its C equivalent, it revealed to be slower than the C version on a PIII (although a bit faster on an Athlon XP). I've also added MMX and PIII replacements for SDL_memcpy. Those provide some speed up in testvidinfo -benchmark (at least for me, under linux & X11).

#!/bin/sh
#
echo "Generating build information using aclocal, automake and autoconf"
echo "This may take a while ..."

# Touch the timestamps on all the files since CVS messes them up
directory=`dirname $0`
touch $directory/configure.in

# Regenerate configuration files
aclocal
automake --foreign --include-deps --add-missing --copy
autoconf
(cd test; aclocal; automake --foreign --include-deps --add-missing --copy; autoconf)

# Run configure for this platform
#./configure $*
echo "Now you are ready to run ./configure"