Don't run PRE at -Os

[Mostafa Hagog]

gcc-patches-owner@gcc.gnu.org wrote on 28/10/2004 20:37:13:

>
> On Oct 28, 2004, at 2:23 PM, Diego Novillo wrote:
>
> >
> > PRE tends to generate bigger code at -Os.  There's a PR associated with
> > this that was mentioned today on IRC.  I don't recall which was it,
> > though.

Does this mean that we are disabling also the removal of fully redundant
expressions?  IMHO, enabling fully redundant expression elimination and
disabling only partially redundant expression elimination would give better
results for -Os.

>
> It was PR 17549.
>
> -- Pinski
>