1 Jul
2004
1 Jul
'04
8:29 p.m.
Malcolm Baldridge schrieb:
gcc options as a starting point:
CFLAGS='-O2 -mfpmath=sse -msse2 -march=pentium4 -mcpu=pentium4 \
-fomit-frame-pointer -s' CXXFLAGS='-O2 -mfpmath=sse -msse2 \
-march=pentium4 -mcpu=pentium4 -fomit-frame-pointer -s' ./configure blah..
=MB=
minor nit because I see that very often. :) from the gcc man page:
-march=cpu-type
Generate instructions for the machine type cpu-type.
The choices for cpu-type are the same as for -mcpu.
Moreover, specifying -march=cpu-type implies
-mcpu=cpu-type.
The extra -mcpu is unnesessery :). And theres a -mmmx switch, but I
don't know if it is that useful for DSP, since the mmx instructions are
integer only.
Good thing you didn't recommend -O3. I've seen instances where it was
much slower than -O2.