Re: [Monotone-devel] could we get away with requiring perl during the build, for botan's sake?

[Jack Lloyd]

On Tue, Oct 16, 2007 at 12:30:49PM +0200, Markus Schiltknecht wrote:
> Hi,
> 
> Markus Schiltknecht wrote:
> >AFAICT botan doesn't provide 
> >lots of optimized assembler code, yet. So that might not be much of an 
> >issue, yet.
> 
> Sorry, I revoke that statement. There are quite some CPU specific 
> assembler optimizations in botan. Especially also for SHA-1, which could 
> serve us very well.
> 
> I'm currently trying to measure potential gains on my Core2Duo CPU with 
> manually configured and added amd64 (ia64) optimizations.

TBH you won't see much performance increase from the x86-64 SHA-1 asm,
I saw it at perhaps 5% faster than GCC-compiled C++ on my Core2. RSA
will be 3-5x faster with the modules alg_amd64 (.S files, AT&T syntax,
assumes ELF ABI) and mp_amd64 (uses GCC-style inline asm with AT&T
syntax). I'm not sure about the 32-bit numbers.

-Jack