1 This is a patched version of zlib, modified to use 2 Pentium-Pro-optimized assembly code in the deflation algorithm. The 3 files changed/added by this patch are: 4 5 README.686 6 match.S 7 8 The speedup that this patch provides varies, depending on whether the 9 compiler used to build the original version of zlib falls afoul of the 10 PPro's speed traps. My own tests show a speedup of around 10-20% at 11 the default compression level, and 20-30% using -9, against a version 12 compiled using gcc 2.7.2.3. Your mileage may vary. 13 14 Note that this code has been tailored for the PPro/PII in particular, 15 and will not perform particuarly well on a Pentium. 16 17 If you are using an assembler other than GNU as, you will have to 18 translate match.S to use your assembler's syntax. (Have fun.) 19 20 Brian Raiter 21 breadbox (a] muppetlabs.com 22 April, 1998 23 24 25 Added for zlib 1.1.3: 26 27 The patches come from 28 http://www.muppetlabs.com/~breadbox/software/assembly.html 29 30 To compile zlib with this asm file, copy match.S to the zlib directory 31 then do: 32 33 CFLAGS="-O3 -DASMV" ./configure 34 make OBJA=match.o 35
