* -O and other optimization flags
@ 2006-07-04 4:54 zhou13
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From: zhou13 @ 2006-07-04 4:54 UTC (permalink / raw)
To: gcc-help
Hello GCC-Help list:
I am wondering if i have used -O, -O2 or -O3, do i still benifit from
flags such as -march -fmpmath -ffast-math -mmx -sse -sse2 -3dnow?
I am optimizing a video codec and i see barely any performance
difference whether i use just -O2 or "-ffast-math -march=athlon-xp
-mmmx -msse -msse2 -m3dnow -mfpmath=sse,387 -O3".
The codec is at http://www.sourceforge.net/projects/openavs/.
Currently, it requires a 3Ghz or better CPU to get a resonable
framerate. I would like the codec to be useful even on 586 ( 1Ghz or
so ). Any ideas?
Regards
Lionel
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