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README.686

      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