Subject: Re: [linux-audio-dev] Traps in floating point code
From: Steve Harris (S.W.Harris_AT_ecs.soton.ac.uk)
Date: Thu Jul 01 2004 - 12:04:23 EEST
On Thu, Jul 01, 2004 at 10:25:51AM +0200, Ruben van Royen wrote:
> Hi all,
>
> please note that SSE2 has support for 64bit floats (doubles) and contains an
> instruction that truncates to int, irregardless of controlwords. A new enough
> gcc with (-march=pentium4 or -msse2) and -mfpmath=sse will use sse instead of
> the old fp unit. This has more advantages, since sse math uses normal
> registers instead of the stack in the old fp unit.
>
> The disadvantage is of course that it does not run on older processors. I'm
> also not sure what level of sse athlon currently supports. The last time I
> looked, it only supported sse. This is also good, but it lacks support for
> double precision floatingpoint.
Also early gcc3's will often produce code that will give bus errors, or
illigal instructions (I forget which) if you try to execute it.
- Steve
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