mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-22 23:29:39 +08:00
35 lines
1.0 KiB
Plaintext
35 lines
1.0 KiB
Plaintext
This is a patched version of zlib, modified to use
|
|
Pentium-Pro-optimized assembly code in the deflation algorithm. The
|
|
files changed/added by this patch are:
|
|
|
|
README.686
|
|
match.S
|
|
|
|
The speedup that this patch provides varies, depending on whether the
|
|
compiler used to build the original version of zlib falls afoul of the
|
|
PPro's speed traps. My own tests show a speedup of around 10-20% at
|
|
the default compression level, and 20-30% using -9, against a version
|
|
compiled using gcc 2.7.2.3. Your mileage may vary.
|
|
|
|
Note that this code has been tailored for the PPro/PII in particular,
|
|
and will not perform particuarly well on a Pentium.
|
|
|
|
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
|