Date: Thu, 7 Jan 1999 13:45:36 -0500 (EST) From: Stuart Anderson <anderson@metrolink.com> To: Doug Rabson <dfr@nlsystems.com> Cc: freebsd-ports@FreeBSD.ORG, freebsd-alpha@FreeBSD.ORG Subject: Re: Mesa3 on alpha Message-ID: <Pine.BSF.3.96.990107134428.10384E-100000@trantor.sc.metrolink.com> In-Reply-To: <Pine.BSF.4.01.9901071641320.391-100000@herring.nlsystems.com>
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On Thu, 7 Jan 1999, Doug Rabson wrote:
> > Does it run OK? When porting OpenGL, I found that egcs was the only compiler
> > that would generate correct code for the Alpha. The others would always
> > end up SIGFPEs.
>
> It seems to run most of the tests ok (built non-optimised) but I can't
> claim to have actually tested it much. It probably needs to be built with
> the software completion flags (-mtrap-precision=i -mfp-trap-mode=su) since
> I can imagine generating a few denormalised numbers when rasterising a few
> pathological triangles.
>
> In alpha code, strange SIGFPEs often mean that your program needs software
> completion since the chip won't perform calculations which either use or
> generate non-finite or denormalised numbers.
I found that even with these flags, a few incorrect instructions were
generated by gcc 8-(.
Stuart
Stuart R. Anderson anderson@metrolink.com
Metro Link Incorporated South Carolina Office
4711 North Powerline Road 105 Fox Ridge Run
Fort Lauderdale, Florida 33309 Lexington, SC 29072
voice: 954.938.0283 voice: 803.951.3630
fax: 954.938.1982 SkyTel: 800.405.3401
http://www.metrolink.com/
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