This is the mail archive of the
mailing list for the GCC project.
Re: gcc & g4 processor?
- To: David Edelsohn <dje at watson dot ibm dot com>
- Subject: Re: gcc & g4 processor?
- From: adam morley <axm135 at po dot cwru dot edu>
- Date: Mon, 7 May 2001 12:59:44 -0400
- Cc: gcc at gcc dot gnu dot org
- References: <firstname.lastname@example.org> <200105071651.MAA22172@makai.watson.ibm.com>
On Mon, May 07, 2001 at 12:51:58PM -0400, David Edelsohn wrote:
> >>>>> adam morley writes:
> adam> so i was looking @ apples website, specifically what compiler they
> include with the now shipping Mac OS X. its gcc 2.95.2. it has a special
> option -faltivec to compile with altivec enhancements.
> adam> is this included in regular download of gcc from one of the mirrors?
> ie, can i put it on linux ppc, openbsd, whatever, compile it and get that
> Motorola has not assigned the changes to the FSF, so they cannot
> be included in the FSF sources. In the interim, the GCC infrastructure
> for supporting SIMD instructions has been improved by an Intel contract
> with Red Hat to support MMX/SSE instructions. Apple has stated that it is
> investigating rewriting the AltiVec support from scratch without any
> Motorola IP using the new GCC SIMD infrastructure.
interesting. this brings up another point: will there be support for things like VIS from sun? i know sun already has a compiler which does a very very good job of optimizing, so i doubt if sun would build support into gcc.
is there a timetable for apple's altivec support?
> adam> plus, how good is PPC optimization under gcc?
> Good, not great. It depends a lot on the type of algorithm.
> Informal performance comparisons seem to show that GCC is anywhere from
> 30% worse to 5% better than IBM's Visual Age compiler on specific
and im guessing this doesn't run under openbsd.
any and all ideas herein are the sole property of the author, with no implied warranties or guarantees. unless its somebody else's already.