1readme.x64
2==========
3
4[Note - the gvmat64.asm longest_match routine in Windows 64-bit assembler
5and makefile.a64 used to compile it were provided at the last minute and
6are currently untested by Info-ZIP.  They are provided to allow testing of
7this optimization which is planned for inclusion in Zip 3.0.
8USE AT YOUR OWN RISK.  That said, thanks Gilles for providing this
9optimization and we plan to better support it in Zip 3.0.  2/28/2005 EG]
10
11makefile.asm64 is a makefile for 64 bits optimized version of zip for 
12Microsoft Windows running on AMD64 (Athlon64/Opteron) and Intel EM64T
13(the Pentium 4 and Xeon with 64 bits extension)
14
15makefile.asm64 contain a makefile for 64 Microsoft C++ for Windows 64 bits,
16extended edition (for both AMD64 and Intel EM64T), included in Visual
17Studio 2005
18
19to compile it, start the C++ AMD64 build environnement prompt,
20go to the zip source directory and start
21
22   nmake -a -f makefile.a64
23
24This makefile uses gvmat64.asm, which is the optimized longest_match written
25in assembly code for AMD64/Intel EM64T
26
27gvmat64.asm was tested by Gilles Vollant on AMD64 with infozip, and also tested
28with a lot of file with zLib 1.2.2 on both AMD64 and Intel EM64T processor.
29
30It was written by Gilles Vollant, by modifiying the longest_match
31from Jean-loup Gailly in deflate.c of zLib and infoZip zip.
32and modifying asm686 (1998), optimised assembly code from Brian Raiter,
33(see http://www.muppetlabs.com/~breadbox/software/assembly.html)
34
35
36Gilles Vollant
37info@winimage.com
38
39http://www.winimage.com
40http://www.winimage.com/zLibdll
41
42
43