From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 12913 invoked by alias); 17 Mar 2003 09:26:01 -0000 Mailing-List: contact gcc-prs-help@gcc.gnu.org; run by ezmlm Precedence: bulk List-Archive: List-Post: List-Help: Sender: gcc-prs-owner@gcc.gnu.org Received: (qmail 12872 invoked by uid 71); 17 Mar 2003 09:26:00 -0000 Date: Mon, 17 Mar 2003 09:26:00 -0000 Message-ID: <20030317092600.12871.qmail@sources.redhat.com> To: nobody@gcc.gnu.org Cc: gcc-prs@gcc.gnu.org, From: Robert Schiele Subject: Re: optimization/8300: [3.2/3.3/3.4 regression] [sparc] ICE in gen_reg_rtx, at emit-rtl.c:662 Reply-To: Robert Schiele X-SW-Source: 2003-03/txt/msg01110.txt.bz2 List-Id: The following reply was made to PR optimization/8300; it has been noted by GNATS. From: Robert Schiele To: Richard Henderson , rth@gcc.gnu.org, gcc-bugs@gcc.gnu.org, gcc-prs@gcc.gnu.org, nobody@gcc.gnu.org, tneumann@pi3.informatik.uni-mannheim.de, gcc-gnats@gcc.gnu.org Cc: Subject: Re: optimization/8300: [3.2/3.3/3.4 regression] [sparc] ICE in gen_reg_rtx, at emit-rtl.c:662 Date: Mon, 17 Mar 2003 10:25:04 +0100 --AqsLC8rIMeq19msA Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Mon, Mar 17, 2003 at 01:05:55AM -0800, Richard Henderson wrote: > On Mon, Mar 17, 2003 at 06:08:21AM +0100, Robert Schiele wrote: > > *(&c + 1) is also well defined. >=20 > How's that? It's pointer arithmetic: Assume you have the following memory layout... | | +---+ | | <=3D=3D ... then the contents of that address is *(&c + 1) +---+ | c | +---+ | | It is: c: The contents of the variable c on the stack. &c: The address where c is located on the stack. &c + 1: That address plus 4 byte. (sizeof(int) =3D=3D 4 on sparc) *(&c + 1): The contents of the above address. > > 1. My rewritten example is legal code with no doubt and produces an > > ICE whit optimization. >=20 > Nyet. Well, I still don't see why this is illegal. Can you give me the paragraph of the C standard that prohibits this sort of pointer arithmetic? Robert --=20 Robert Schiele Tel.: +49-621-181-2517 Dipl.-Wirtsch.informatiker mailto:rschiele@uni-mannheim.de --AqsLC8rIMeq19msA Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.0.7 (GNU/Linux) iQEVAwUBPnWUcMQAnns5HcHpAQGdKggAlK9ZV4OgrAY+7UCvuoO7BbUg6PgbHhXQ 02LxCX3fN5FXsyvj5nVfD8ZbwK42rh6w95hb0XloKZwQMM7+izJala5SEOgghyUN l3Wlr7f30yJOudPHFanqBtyfOuQJP9gWBfFIssIDtdAOx+ZpBxb8XGbpex5EAPWG T5/DBchE6zrM46R7XCBdRurZ2PFTh6E9k7dJwfjOh+h5O0R6Npvv3NLHuvdfHfJk vCfyZgRM8K96KmOzmetAytCsU01aD/6UsGOPhntnlqpOfysC87aPAJ9Zam6wCmMr pq8hzQa7hdaVVUjnZbltLMQ/XY1/mHft6S1C95eekY5EPtFVEzCO1w== =0Vp8 -----END PGP SIGNATURE----- --AqsLC8rIMeq19msA--