Re: x86 SHA1: Faster than OpenSSL

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hi,

On Wed, 5 Aug 2009, George Spelvin wrote:

> > Three classes of people compile git from the source:
> >
> > * People who want to be on the bleeding edge and compile git for
> >   themselves, even though they are on mainstream platforms where they
> >   could choose distro-packaged one;
> >
> > * People who produce binary packages for distribution.
> >
> > * People who are on minority platforms and have no other way to get git
> >   than compiling for themselves;
> >
> > We do not have to worry about the first two groups of people.  It won't
> > be too involved for them to install Perl on their system; after all they
> > are already coping with asciidoc and xmlto ;-)
> 
> Actually, I'd get rid of the perl entirely, but I'm not sure how
> necessary the other-assembler-syntax features are needed by the
> folks on MacOS X and Windows (msysgit).

Don't worry for MacOSX and msysGit (or Cygwin, for that matter): all of 
them use GCC.

> > We can continue shipping mozilla one to help the last group.
> 
> Of course, we always need a C fallback.  Would you like a faster one?

Is that a trick question?

:-)

> > In the Makefile, we say:
> >
> >    # Define NO_OPENSSL environment variable if you do not have OpenSSL.
> >    # This also implies MOZILLA_SHA1.
> >
> > and with your change, we would start implying STANDALONE_OPENSSL_SHA1
> > instead.  But if MOZILLA_SHA1 was given explicitly, we could use that.
> 
> Well, I'd really like to auto-detect the processor.  Current gcc's
> "gcc -v" output includes a "Target: " line that will do nicely.  I can,
> of course, fall back to C if it fails, but is there a significant user
> base using a non-GCC compiler?

Do you really want to determine which processor to optimize for at compile 
time?  Build system and target system are often different...

Ciao,
Dscho

--
To unsubscribe from this list: send the line "unsubscribe git" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html

[Index of Archives]     [Linux Kernel Development]     [Gcc Help]     [IETF Annouce]     [DCCP]     [Netdev]     [Networking]     [Security]     [V4L]     [Bugtraq]     [Yosemite]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux SCSI]     [Fedora Users]