[Bug tree-optimization/18694] [4.0 regression] loop miscompilation at -O1 (-ftree-ch)

["law at redhat dot com" <gcc-bugzilla@gcc.gnu.org>]

------- Additional Comments From law at redhat dot com  2004-12-09 23:23 -------
Subject: Re:  [4.0 regression] loop
	miscompilation at -O1 (-ftree-ch)

On Thu, 2004-12-09 at 20:02 +0000, kazu at cs dot umass dot edu wrote:
> ------- Additional Comments From kazu at cs dot umass dot edu  2004-12-09 20:02 -------
> Created an attachment (id=7715)
 --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7715&action=view)
>  --> (http://gcc.gnu.org/bugzilla/attachment.cgi?id=7715&action=view)
> a new patch
> 
> This patch is basically the same as the last patch except that
> I've added a fast path for common cases.
> 
> I am testing this with submission to gcc-patches@ in mind.
I believe your fast-path check is effectively equivalent to

if ((e->flags & EDGE_DFS_BACK) == 0)

  
Jeff




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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18694

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