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authorJay Berkenbilt <ejb@ql.org>2009-10-10 19:43:06 +0200
committerJay Berkenbilt <ejb@ql.org>2009-10-10 19:43:06 +0200
commit8f6f4773bc78ee15978657d78a7b44d462bb4416 (patch)
tree0b9a3a06cf62739f98034337189cd14ee6ad5f1d /external-libs/zlib/contrib/asm686/README.686
parentf3bf8d3110b852b8f338898c3237d16a74360cf3 (diff)
downloadqpdf-8f6f4773bc78ee15978657d78a7b44d462bb4416.tar.zst
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-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