[Bug middle-end/26835] ICE in f951 on valid code at -O2 -ftree-loop-linear

[dberlin at dberlin dot org]

------- Comment #2 from dberlin at gcc dot gnu dot org  2006-03-24 12:27 -------
Subject: Re:  ICE in f951 on valid code at -O2
        -ftree-loop-linear

On Fri, 2006-03-24 at 10:30 +0000, rguenth at gcc dot gnu dot org wrote:
> 
> ------- Comment #1 from rguenth at gcc dot gnu dot org  2006-03-24 10:30 -------
> Confirmed.  We ICE after IVOPTs during computation of dominance frontiers. 
> Other than that, tree-loop-linear seems to be somewhat buggy in general.
> 

The code generation portion of tree-loop-linear is pretty solid (there
may be a few off by one errors lurking, however).
The perfect nest conversion is a rats nest in a lot of ways, because
it's a really really bad hack to avoid real loop distribution.

I've seen cases where it breaks the cfg and dominance info.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26835