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Diffstat (limited to 'source4/lib/zlib/contrib/asm686/README.686')
| -rw-r--r-- | source4/lib/zlib/contrib/asm686/README.686 | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/source4/lib/zlib/contrib/asm686/README.686 b/source4/lib/zlib/contrib/asm686/README.686 new file mode 100644 index 0000000000..a593f23afd --- /dev/null +++ b/source4/lib/zlib/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 |