From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 18272 invoked by alias); 16 Jul 2002 10:54:14 -0000 Mailing-List: contact binutils-help@sources.redhat.com; run by ezmlm Precedence: bulk List-Subscribe: List-Archive: List-Post: List-Help: , Sender: binutils-owner@sources.redhat.com Received: (qmail 18132 invoked from network); 16 Jul 2002 10:54:12 -0000 Received: from unknown (HELO delta.ds2.pg.gda.pl) (213.192.72.1) by sources.redhat.com with SMTP; 16 Jul 2002 10:54:12 -0000 Received: from localhost by delta.ds2.pg.gda.pl (8.9.3/8.9.3) with SMTP id MAA24010; Tue, 16 Jul 2002 12:54:33 +0200 (MET DST) Date: Tue, 16 Jul 2002 03:57:00 -0000 From: "Maciej W. Rozycki" To: Thiemo Seufer cc: cgd@broadcom.com, Richard Sandiford , gcc-patches@gcc.gnu.org, binutils@sources.redhat.com Subject: Re: RFC & patch: Rework MIPS command-line handling In-Reply-To: <20020715185629.GC16056@rembrandt.csv.ica.uni-stuttgart.de> Message-ID: Organization: Technical University of Gdansk MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-SW-Source: 2002-07/txt/msg00365.txt.bz2 On Mon, 15 Jul 2002, Thiemo Seufer wrote: > Note that the MIPS II is a deviation from stock o32 ABI, the > linux-mips kernel emulates the necessary instructions on MIPS I > hardware. This means we have an o32-linux ABI there. Does it? I haven't seen any code to emulate trap, branch likely, dword coprocessor transfer instructions. What is emulated are only the ll and sc instructions, but they are only a small subset of MIPS II extensions which is never used by gcc, unlike the others. > > If they're using mipsisa64sb1-linux, they probably expect built-in > > support for, say, MIPS-3D, MDMX .ob, and the few SB-1 extensions as > > well, regardless of the ABI they choose on the command line. > > If all of the hardware for this target supports these, ok. > But the ISA pre-selection should then be done in the target specific > code and not globally. If a target triplet defines a CPU, it should always be used as the default for uniformity. -- + Maciej W. Rozycki, Technical University of Gdansk, Poland + +--------------------------------------------------------------+ + e-mail: macro@ds2.pg.gda.pl, PGP key available +