[Bug tree-optimization/37242] missed FRE opportunity because of signedness of addition

[rguenther at suse dot de]

------- Comment #14 from rguenther at suse dot de  2008-08-28 08:02 -------
Subject: Re:  missed FRE opportunity because of
 signedness of addition

On Thu, 28 Aug 2008, bonzini at gnu dot org wrote:

> ------- Comment #13 from bonzini at gnu dot org  2008-08-28 06:16 -------
> Answering to your comment #11, one is a sizetype and one is not.  But it is
> enough to extend my fold-const.c patch to MULT_EXPRs in order to catch it.
> 
> Also, the problem with the full testcase is that PRE is not cascading "enough".
>  Adding another PRE pass right after the first catches it.

That would be a bug unless its a very weird case.  PRE iterates
insertion for this case for example.

Richard.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=37242