Donn Miller wrote:
>
> It's probably more of a "placebo effect", which makes you think your
> are getting a big boost in performance. I'll admit that I've never
> seen a whole order or magnitude increase in performance between -O and
> -mpentium-O3, or whatever - it probably gives you boosts here and
> there. Optimization is pretty good, as I've found out, with
> plain-jane -O. Beyond that, I think your performance gains are
> minimal.
>
> And yes, I think it's really macho to be usin' hopped-up CFLAGS, like
> -march=pentium -Os -pipe. I feel really studly doing this. :-)
Damn straight!
But you ain't seen nothing yet...
> We should do a survey, and find out what the guys use for CFLAGS and
> COPTFLAGS and compare them to what the female users are using. That
> would be interesting.
Let's get the ball rolling then, shall we?
CFLAGS/COPTFLAGS for day-to-day compiles (kernel, X, world, etc.):
-O3 -march=pentiumpro -malign-double -fomit-frame-pointer -funroll-loops
-fstrict-aliasing -pipe
CFLAGS when I *REALLY* feel the need for speed (lame, mpg123, xmame,
etc.):
-O3 -march=pentiumpro -malign-double -malign-loops=4 -malign-jumps=4
-malign-functions=4 -fomit-frame-pointer -ffast-math -funroll-loops
-fstrict-aliasing -pipe
-O2 used to be my switch of choice so the -funroll-loops flag in the
above strings may be redundant (can't remember). Considering, though,
that the length of one's CFLAGS variable is directly proportional to
studliness, I have little choice but to leave it there ;-)
Can't say that I care for football, though.
> - Donn
-jake
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