[Bug tree-optimization/32540] [4.3 Regression] Exponential time behavior in PRE

["dberlin at dberlin dot org" <gcc-bugzilla at gcc dot gnu dot org>]

------- Comment #8 from dberlin at gcc dot gnu dot org  2007-10-20 20:49 -------
Subject: Re:  [4.3 Regression] Exponential time behavior in PRE

We may just want to disable PPRE of constants entirely :)


On 20 Oct 2007 10:14:53 -0000, rguenth at gcc dot gnu dot org
<gcc-bugzilla@gcc.gnu.org> wrote:
>
>
> ------- Comment #7 from rguenth at gcc dot gnu dot org  2007-10-20 10:14 -------
> I guess we just compute all 2**26 constants that can end up at the conditional
> store.  And indeed, the number of 'Created value .*' in the dump matches this
> (modulo some constant offset).  This is PPRE at work, which probably should
> be limited to a sub-CFG somehow.
>
>
> --
>
>
> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32540
>
> ------- You are receiving this mail because: -------
> You are on the CC list for the bug, or are watching someone who is.
>


-- 


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=32540