From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <SRS0=bbp4=D5=troutmask.apl.washington.edu=sgk@sourceware.org>
Received: from troutmask.apl.washington.edu (troutmask.apl.washington.edu [128.95.76.21])
	by sourceware.org (Postfix) with ESMTPS id 2B9243858D20
	for <fortran@gcc.gnu.org>; Sat, 12 Aug 2023 16:05:38 +0000 (GMT)
DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 2B9243858D20
Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=troutmask.apl.washington.edu
Authentication-Results: sourceware.org; spf=none smtp.mailfrom=troutmask.apl.washington.edu
Received: from troutmask.apl.washington.edu (localhost [127.0.0.1])
	by troutmask.apl.washington.edu (8.17.1/8.17.1) with ESMTPS id 37CG5aNA055888
	(version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO);
	Sat, 12 Aug 2023 09:05:36 -0700 (PDT)
	(envelope-from sgk@troutmask.apl.washington.edu)
Received: (from sgk@localhost)
	by troutmask.apl.washington.edu (8.17.1/8.17.1/Submit) id 37CG5awL055887;
	Sat, 12 Aug 2023 09:05:36 -0700 (PDT)
	(envelope-from sgk)
Date: Sat, 12 Aug 2023 09:05:36 -0700
From: Steve Kargl <sgk@troutmask.apl.washington.edu>
To: "Jorge D'Elia via Fortran" <fortran@gcc.gnu.org>
Cc: Paul Richard Thomas <paul.richard.thomas@gmail.com>,
        "Jorge D'Elia" <jdelia@intec.unl.edu.ar>, Jerry <jvdelisle2@gmail.com>
Subject: Re: beta gfortran 14.x.y (using -march=native and intrinsic repeat)
 gives a signal SIGILL
Message-ID: <ZNet0IPu4/ch2oCz@troutmask.apl.washington.edu>
Reply-To: sgk@troutmask.apl.washington.edu
References: <1302200217.1817.1691757297462.JavaMail.zimbra@intec.unl.edu.ar>
 <aac7dcb1-7fa6-7a09-447c-19e8f2cde6e5@gmail.com>
 <CAGkQGiL=BHKnna2vf4qxWpTQuhruXDd1OvdCmY8-8=JhmkiDOw@mail.gmail.com>
 <1762418863.818.1691847670663.JavaMail.zimbra@intec.unl.edu.ar>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <1762418863.818.1691847670663.JavaMail.zimbra@intec.unl.edu.ar>
X-Spam-Status: No, score=-1.6 required=5.0 tests=BAYES_00,KAM_DMARC_STATUS,KAM_LAZY_DOMAIN_SECURITY,SPF_HELO_NONE,SPF_NONE,TXREP autolearn=no autolearn_force=no version=3.4.6
X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org
List-Id: <fortran.gcc.gnu.org>

On Sat, Aug 12, 2023 at 10:41:10AM -0300, Jorge D'Elia via Fortran wrote:
> 
> $ test-march.exe 
> 
> Program received signal SIGILL: Illegal instruction.
> 

This, to me, suggests that the backend is emitting a wrong
assembly language code.  I suspect that you'll need to 
compare the generated assembly code between a working 
gfortran and the bad gfortran.  It is also possible to get
a listing of the actually options that -march=native activates.
For example,

% gfcx -o z -O -march=native --verbose a.f90

It is the options that begin with -m that matter.  For my hardware
I see 108 such options.  With patients you can determine if one 
of these triggers the issues.

One can also scan gcc/gcc/ChangeLog for changes to config/i386/i386.md.
For example 

2023-08-07  Jan Beulich  <jbeulich@suse.com>

        * config/i386/i386.md (sse4_1_round<mode>2): Make
        "length_immediate" uniformly 1.
        * config/i386/mmx.md (mmx_pblendvb_v8qi): Likewise.
        (mmx_pblendvb_<mode>): Likewise.

There are at least 10 commits on 2023-08-07 to this file.

Finally, as a non-git user, you can always try git's bisection
feature to identify where things go left.

-- 
Steve