[PlanetCCRMA] Pentium-4 and denormal numbers on planetccrma

andersvi@extern.uio.no andersvi@extern.uio.no
Wed Jan 12 05:48:02 2005

Question is whether these switches (without the -mcpu=pentium4
switch), or another solution to the problem, can be used in
general for the whole planet-distribution?  With not much
knowledge about denormal numbers, I guess all "realtime" apps
might suffer from the same problem.  Jack, softsynths, plugins,

One use of planetccrma is to make installing precompiled audio
and video-apps easy.  This problem brings at least me back to
stage 1.

>>> On Wed, 12 Jan 2005 11:40:18 +0000, Steve Harris <S.W.Harris@ecs.soton.ac.uk> said:

>> The fix was to recompile pd and the percolate-lib with
>> -mcpu=pentium4 -mfpmath=sse -msse
>> included in CFLAGS (not sure whether "-mcpu=pentium4" actually
>> was necessary).
>> Ive started recompiling various externals and other things with
>> the flags included.  Im not sure, but wouldnt this be a problem
>> with all apps running loops calculating numbers around zero
>> somewhere.  Would it be a solution to compile coming upgrades at
>> planetccrma with these same flags?
S> You dont need -mcpu=pentium4. It will help P4's, and Athlon
S> XP's and PIII's to a lesser extent, but it will not work on pre-XP Athlons
S> or Pentium II's and older, or chips by most other manufacturers.