From 14763ac7c6c03bca62c39e35c03cf5bfc7728802 Mon Sep 17 00:00:00 2001 From: Mark Adler Date: Fri, 9 Sep 2011 23:20:29 -0700 Subject: zlib 1.1.3 --- contrib/asm686/README.686 | 34 ++++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 contrib/asm686/README.686 (limited to 'contrib/asm686/README.686') diff --git a/contrib/asm686/README.686 b/contrib/asm686/README.686 new file mode 100644 index 0000000..a593f23 --- /dev/null +++ b/contrib/asm686/README.686 @@ -0,0 +1,34 @@ +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 -- cgit v1.2.3-55-g6feb