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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /zlib/contrib/asm586/README.586 | |
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Checked in the following released items:
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font-sun-misc-1.0.0.tar.gz
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font-sony-misc-1.0.0.tar.gz
font-schumacher-misc-1.0.0.tar.gz
font-mutt-misc-1.0.0.tar.gz
font-misc-misc-1.0.0.tar.gz
font-misc-meltho-1.0.0.tar.gz
font-micro-misc-1.0.0.tar.gz
font-jis-misc-1.0.0.tar.gz
font-isas-misc-1.0.0.tar.gz
font-dec-misc-1.0.0.tar.gz
font-daewoo-misc-1.0.0.tar.gz
font-cursor-misc-1.0.0.tar.gz
font-arabic-misc-1.0.0.tar.gz
font-winitzki-cyrillic-1.0.0.tar.gz
font-misc-cyrillic-1.0.0.tar.gz
font-cronyx-cyrillic-1.0.0.tar.gz
font-screen-cyrillic-1.0.1.tar.gz
font-xfree86-type1-1.0.1.tar.gz
font-adobe-utopia-type1-1.0.1.tar.gz
font-ibm-type1-1.0.0.tar.gz
font-bitstream-type1-1.0.0.tar.gz
font-bitstream-speedo-1.0.0.tar.gz
font-bh-ttf-1.0.0.tar.gz
font-bh-type1-1.0.0.tar.gz
font-bitstream-100dpi-1.0.0.tar.gz
font-bh-lucidatypewriter-100dpi-1.0.0.tar.gz
font-bh-100dpi-1.0.0.tar.gz
font-adobe-utopia-100dpi-1.0.1.tar.gz
font-adobe-100dpi-1.0.0.tar.gz
font-util-1.0.1.tar.gz
font-bitstream-75dpi-1.0.0.tar.gz
font-bh-lucidatypewriter-75dpi-1.0.0.tar.gz
font-adobe-utopia-75dpi-1.0.1.tar.gz
font-bh-75dpi-1.0.0.tar.gz
bdftopcf-1.0.1.tar.gz
font-adobe-75dpi-1.0.0.tar.gz
mkfontscale-1.0.6.tar.gz
openssl-0.9.8k.tar.gz
bigreqsproto-1.0.2.tar.gz
xtrans-1.2.2.tar.gz
resourceproto-1.0.2.tar.gz
inputproto-1.4.4.tar.gz
compositeproto-0.4.tar.gz
damageproto-1.1.0.tar.gz
zlib-1.2.3.tar.gz
xkbcomp-1.0.5.tar.gz
freetype-2.3.9.tar.gz
pthreads-w32-2-8-0-release.tar.gz
pixman-0.12.0.tar.gz
kbproto-1.0.3.tar.gz
evieext-1.0.2.tar.gz
fixesproto-4.0.tar.gz
recordproto-1.13.2.tar.gz
randrproto-1.2.2.tar.gz
scrnsaverproto-1.1.0.tar.gz
renderproto-0.9.3.tar.gz
xcmiscproto-1.1.2.tar.gz
fontsproto-2.0.2.tar.gz
xextproto-7.0.3.tar.gz
xproto-7.0.14.tar.gz
libXdmcp-1.0.2.tar.gz
libxkbfile-1.0.5.tar.gz
libfontenc-1.0.4.tar.gz
libXfont-1.3.4.tar.gz
libX11-1.1.5.tar.gz
libXau-1.0.4.tar.gz
libxcb-1.1.tar.gz
xorg-server-1.5.3.tar.gz
Diffstat (limited to 'zlib/contrib/asm586/README.586')
-rw-r--r-- | zlib/contrib/asm586/README.586 | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/zlib/contrib/asm586/README.586 b/zlib/contrib/asm586/README.586 new file mode 100644 index 000000000..6bb78f320 --- /dev/null +++ b/zlib/contrib/asm586/README.586 @@ -0,0 +1,43 @@ +This is a patched version of zlib modified to use +Pentium-optimized assembly code in the deflation algorithm. The files +changed/added by this patch are: + +README.586 +match.S + +The effectiveness of these modifications is a bit marginal, as the the +program's bottleneck seems to be mostly L1-cache contention, for which +there is no real way to work around without rewriting the basic +algorithm. The speedup on average is around 5-10% (which is generally +less than the amount of variance between subsequent executions). +However, when used at level 9 compression, the cache contention can +drop enough for the assembly version to achieve 10-20% speedup (and +sometimes more, depending on the amount of overall redundancy in the +files). Even here, though, cache contention can still be the limiting +factor, depending on the nature of the program using the zlib library. +This may also mean that better improvements will be seen on a Pentium +with MMX, which suffers much less from L1-cache contention, but I have +not yet verified this. + +Note that this code has been tailored for the Pentium in particular, +and will not perform well on the Pentium Pro (due to the use of a +partial register in the inner loop). + +If you are using an assembler other than GNU as, you will have to +translate match.S to use your assembler's syntax. (Have fun.) + +Brian Raiter +breadbox@muppetlabs.com +April, 1998 + + +Added for zlib 1.1.3: + +The patches come from +http://www.muppetlabs.com/~breadbox/software/assembly.html + +To compile zlib with this asm file, copy match.S to the zlib directory +then do: + +CFLAGS="-O3 -DASMV" ./configure +make OBJA=match.o |