[linux-audio-user] amd vs p4

Tim Blechmann TimBlechmann at gmx.net
Wed Feb 18 07:20:30 EST 2004

> I'm not up-to-date on benchmarks so I cant comment, but just to
> clarify the denormal thing in P4's is not a bug, its how you handle
> denormals, the only difference is that the P4 takes longer to handle
> them so you get away with it less often.
> Ideally DSP software would be written so that it never generates them,
> but, erm, well, developers are lazy, y'know :)
sure, denormals are not a bug, but the behaviour on dsp systems that
aren't denormal-save is similar to a bug ;-)

> On the P4 its possible that you can set some flags to use SSE
> instructions instead of 387 and tell the SSE unit to never produce
> denormals, but last time I tried it, gcc 3.something generated bad
> code (illegal instructions).
wait ... you imply that the sse unit doesn't produce denormals, so that
a -march=sse _should_ solve all dsp user problems?
i heard that gcc 3.2 produces illegal instructions, but that it's solved
in gcc 3.3 ... can anyone confirm / deny this?


 Tim                          mailto:TimBlechmann at gmx.de
                              ICQ: 96771783
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