Calculating elements addresses from arrays once

[Gruik]

He means use the "-O1" or "-O2" optimisation options like:

 gcc -O1 foobar.c

or

 gcc -O2 foobar.c

As for your original question, if you're a bit familiar
with assembly language you can readily check how well
GCC is able to optimise your code by looking at the
assembly output like so:
 gcc -O2 -S foobar.c

This would create a file named "foobar.s" which by
default uses the AT&T assembler syntax - use "-masm=intel"
(on x86 boxes) to use the more popular Intel assembler
syntax, like so:
 gcc -O2 -S -masm=intel foobar.c

Hope this helps,
Ranjit.
 

Oh okay, (i had read "Zero" instead of "O")
Thanks
And what's the drawback of using -O2 option? Only a longer compilation time?

Well i'm not really familiar with asm..

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