regarding optimization flags

[Fabian Cenedese]

At 16:52 25.02.2007 +0000, ranjith kumar wrote:
>Gcc manuals says 
>   " Not all optimizations are controlled 'directly'
>by a flag.  Only optimizations that have a flag are
>listed."
>
>What does it mean?
>Any one please help me.

-Ox does not only switch on -fx -fy -fz... but also some internal settings
for optimization not separately accessible with any -f option and therefore
not listed in the verbose-asm. This means that you will never be able
to achieve the same result with any combination of -f... as you can
do with an -Ox.

bye  Fabi