gcc peephole problem

[kevin diggs]

Hi,

This might make 2!

On Wed, Apr 6, 2011 at 10:59 PM, vikramsp <vikram2rhyme@gmail.com> wrote:
>
> Hello there. I was exploring about peephole and peephole2 optimisation
> passes of gcc c compiler. when compiling a test.c programme like this -
>
> ~$ gcc test.c -fpeephole2 -da
>
> there was no dump for peephole2 pass. same is for -fpeephole.
> Does it mean that peephole passes are not done or is there any
> other way to do so.
> Please help me
>

You have to have one of the -O options (I doubt that -O0 counts) to
have optimizations done. It won't help to just have your favorite -f:

gcc -c -O2 -fpeephole -da test.c

If you use -v you might see if -fpeephole is already included in one
of the -Ox where x is one of 1, 2, or 3.

Thanks.

kevin

> Best Regards
> vikramsp
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