Don't run PRE at -Os

[Daniel Berlin]

On Sun, 31 Oct 2004, Mostafa Hagog wrote:

>
> 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?
No.
We specifically keep that on at -Os.