[luau] compiler optimization?

[Lou Rickard]

A friend of mine reccommended that I play around with
compiler optimizations a bit to see what happens.  I
was a little surprised.

I have an application that's about 10k lines of C code
written for linux.  It's multi-threaded.  It doesn't
do any complicated math.  It compiles to about 1.8MB.

Compiled with no optimizations its size is 1870614
bytes.

Compiled with -O2, it has the same size.  According to
diff, it's identical to the non-optimized version.

Compiled with -Os, it has the same size, and according
to diff, it's identical to the non-optimized version.

Compiled with -O2 -march=pentium3 -mcpu=pentium3
-funroll-loops, it has the same size, and according to
diff, it's identical to the non-optimized version.

I'm running RH 7.2, with RH's 2.9.6 version of gcc, on
a pentium3.

So, I'm a little confused, it seems like the different
optimizations would have had some impact, even if it
wasn't an improvement.  Is it me?  Is it the compiler?
 Is it the relationship I have with the compiler? 
Have I failed to nurture and provide comfort to it in
some way?  Where did I go wrong?

Also, what other optimizations would people reccommend
that wouldn't break the portability of the code itself
(ok to take out Makefile/compiler optimizations, not
ok to write processor specific code)?

L.R.

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