[boost] I need someone with a little-endian system to test an optimization.

From: Daryle Walker (darylew_at_[hidden])
Date: 2008-08-19 14:45:53

I just added an optimization to some code for systems with octet- 
sized bytes.  I have such a system; so I tested that code.  I added a  
further optimization for little-endian systems.  Unfortunately, my  
computer is big-endian, so I have no way to test the second change.   
So if you have access to a computer with octet-sized bytes (CHAR_BIT  
== 8) and larger integers in little-endian format, can you help?

The code is on our Subversion server, in the sandbox section, just  
checked in as revision 48224.  Check-out or export the <http:// 
svn.boost.org/svn/boost/sandbox/md5> directory.  The headers are in  
the "boost" subdirectory, of course.  There is one mandatory source  
file at "libs/coding/src/md5.cpp".  There are three test files at  
"libs/coding/test/md5*test.cpp".  Compile all those together with our  
Unit Test and Serialization libraries.  (On my system, I made a  
project file with a three sub-targets: Boost.Test unit-test,  
Boost.S11N, and md5.cpp; which the target with the test files  
compiled linked to.)

The "md5.cpp" has the optimized code.  The optimized code doesn't  
activate unless CHAR_BIT is 8 and the file's  
BOOST_CONTROL_OPTIMIZE_OCTET_BYTES macro is set (or overridden) to  
1.  The little-endian extra optimization is activated with the  
BOOST_LITTLE_ENDIAN macro and is mandatory (if valid).  I added three  
now-commented-out #error lines to test which case was activated,  
which confirmed I'm using a not-little endian system.  You can un- 
comment those to check for yourself.  Let me know if the little  
endian code works, or tell me how to fix it (if not).  If you want,  
you can comment-out the little endian code to test the endian- 
agnostic code, and then redefine or override  
BOOST_CONTROL_OPTIMIZE_OCTET_BYTES to be 0 to test the octet-agnostic  
code (which explodes the packed array into a bool array before  
combining).

Thanks in advance....

-- 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT hotmail DOT com