[GEM-dev] various pix_objects crashing

IOhannes m zmoelnig zmoelnig at iem.at
Tue Jun 6 16:46:30 CEST 2006


IOhannes m zmoelnig wrote:
> Peter Plessas wrote:
>> Hi!
>>
> so i guess this is your pentium (3??)
> could you try compiling Gem without SIMD enabled?
> "./configure --disable-SIMD" iirc

i was no able to reproduce the crash when running Gem compiled with 
sse2-support on an athlon-XP (which has NO sse2-support).

this is bad.

it shakes my believes that gcc produces code suitable for several 
flavours of cpu, like intels icc is able to do.
(it is also good, since gcc optimizes generic code)

i guess i will have to add some flags to configure which allows you to 
set the level of simd-optimization (like stopping at mmx).
even better would be to autodetect the cpu at configure time and use 
appropriate flags (which could be overruled via cmdline options)

in the meantime, just remove the "-msse2" flag (and make sure that the 
"-mmmx" flag stays, so you have at least _some_ benefit) from the 
Make.config (_after_ configure)

mfa.dr.
IOhannes




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