Conrad J. Sabatier wrote:
On Mon, 13 Sep 2004 12:23:18 -0500, Puna Tannehill <[EMAIL PROTECTED]> wrote:
I've been looking for possible flags, optimizations, really anything that would help me setup my laptop to use mmx and 3dnow. I've updated
/etc/make.conf to -march to the drum of a k6-2, but I'm not even sure if mmx and 3dnow are being taken into consideration for compiling and such, especially for Xorg.
I did some googling and found people who used CFLAGS like -mmmx and -m3dnow, but when I run with those options, they fail and said to be invalid. they don't appear in 'man gcc' which should have been the first place i looked. I'm not finding anything in terms of compiling or configuring Xorg to use 3dnow or mmx, or even how to check to see if they are automatically detected and used.
I don't know why those flags would not be working for you; I've been using them for quite some time now on my Athlon (32-bit) box. One oddity I just noticed very recently is that, with the recent patches to "make", the CPUTYPE variable seems to be ignored now, which is why I explicitly added the "-march" flag to CFLAGS. Also, note that I don't use "-mmmx -m3dnow" for kernel builds; you don't want to be doing this, as it can easily break things in the kernel, but for general builds and port builds, it's fine:
I had that problem too. The '?=' should be just '='. I see in the notes that '?=' is for compiling for different machine, but I don't do that so I just left is as 'CPUTYPE=' and it added the -march accordingly.
CFLAGS= -O3 -pipe -march=athlon -mmmx -m3dnow
# buildkernel variables settings
KERNCONF=CUSTOM COPTFLAGS= -O3 -pipe -march=athlon
I see many people using a -O3, but I've never been able to use any optimization levels above -O without compile errors, or having problems with SSH. Just out of curiosity, do you see a significant different in performance with that level of optimization?
It's working for me now, I'm not sure why it was failing before.
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