On Thursday 21 August 2003 03:37, Meka[ni] wrote: > I'm using "-O3 -march=pentium2 -mmmx -ffast-math -fomit-frame-pointer > -pipe" as CFLAGS (and CXXFLAGS), and I wonder if -mmmx may be omited. The > actual question is, does -march=xxx includes mmx, mmx2, 3dnow, 3dnow2, sse > and sse2 for appropriate arch? And what to use as CFLAGS for my Celeron > 300A (Mendocino)? Thanx a lot. :o)
There's quite a bit of discussion on this in the forums, although it's quite hard to find (among the many many pages in each forum). Basically, -march doesn't add -mmx when using gcc 3.2. However, that's because gcc 3.2 doesn't really support the extensions. If you do add it, gcc adds -mno-mmx without telling you. Adding it with gcc 3.3 works, but I believe -march will add it where appropriate, anyway. Regards, Jason -- [EMAIL PROTECTED] mailing list
