Date: Wed, 4 Jul 2007 23:01:48 +0400 From: Andrey Chernov <ache@nagual.pp.ru> To: Ed Schouten <ed@fxq.nl> Cc: kan@freebsd.org, current@freebsd.org Subject: Re: [Patch] Silent gcc 4.2.0 loop optimization bug with -O2 Message-ID: <20070704190148.GA34853@nagual.pp.ru> In-Reply-To: <20070704121208.GC37187@hoeg.nl> References: <20070625130913.GA50273@nagual.pp.ru> <20070625133951.GA51324@nagual.pp.ru> <8e5ef5f70706250659v48f64410wb5399985a571087e@mail.gmail.com> <20070625145627.GA53685@nagual.pp.ru> <20070625151508.GO27942@hoeg.nl> <20070625152559.GA54055@nagual.pp.ru> <20070625153840.GP27942@hoeg.nl> <20070704121208.GC37187@hoeg.nl>
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On Wed, Jul 04, 2007 at 02:12:08PM +0200, Ed Schouten wrote:
> > Index: tree-ssa-loop-niter.c
> > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > --- tree-ssa-loop-niter.c (revision 126260)
> > +++ tree-ssa-loop-niter.c (working copy)
> > @@ -1747,6 +1747,12 @@ infer_loop_bounds_from_undefined (struct
> > {
> > bb =3D bbs[i];
> >=20
> > + /* If BB is not executed in each iteration of the loop, we cannot
> > + use the operations in it to infer reliable upper bound on the
> > + # of iterations of the loop. */
> > + if (!dominated_by_p (CDI_DOMINATORS, loop->latch, bb))
> > + continue;
> > +
> > for (bsi =3D bsi_start (bb); !bsi_end_p (bsi); bsi_next (&bsi))
> > {
> > tree stmt =3D bsi_stmt (bsi);
> >=20
> > I'm going to test this.
> >=20
> ----- End forwarded message -----
>=20
> I just tested the patch on my desktop and it seems to work. The test
> code now compiles like it should. Hopefully it will be part of 4.2.1.
Will be nice if this patch will be commited in instead of my=20
sys.mk workaround. Alexander?
--=20
http://ache.pp.ru/
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