From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 3A2FD3860C3A; Mon, 17 Aug 2020 18:03:31 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 3A2FD3860C3A
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1597687411;
 bh=d9/3ucfk32XFgD7/Ro4iYWzztZZep67CQ7AJZ4bjqHY=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=MTDQIUxOom4R1dT5LP/CN266DlejWBB35Tygw6JLWGUIyf4wCc157UueTj17aDmDD
 Ychjfb45ft9fuk1Attc5mN5FK4dXgcRHz1JpK7sjkBuEaXZMdNgOPFnNoz5xmnBBtV
 UkmHzBx7+hMGjY/Gvk4fpfoeHZVb9EBS3WqHr9Ts=
From: "anlauf at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/96613] SIGFPE on min1() with -ffpe-trap=invalid switch
Date: Mon, 17 Aug 2020 18:03:31 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: fortran
X-Bugzilla-Version: 10.1.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: anlauf at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P4
X-Bugzilla-Assigned-To: anlauf at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96613-4-NlMNtBhFNH@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96613-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96613-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 17 Aug 2020 18:03:31 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96613

--- Comment #5 from anlauf at gcc dot gnu.org ---
(In reply to kargl from comment #4)
> I thought that this might be a good candidate for frontend fix.=20=20
> Similar to thomas's frontend optimizations except except the=20
> transformation is always done.  That is, we should be able to do
> substitutions based on Table 16.3 before we even get to backend.

If frontend optimization is preferred, I'll step out of the way.

Nevertheless, one also need to address issues like:

% cat maxmin.f90
program p
  implicit none
  print *, min (2.0, 1.d0)
  print *, min (2.d0, 1.0)
  print *, kind (min (2.0, 1.d0))
  print *, kind (min (2.d0, 1.0))
end program p

% gfc-11 maxmin.f90 && ./a.out=20
   1.00000000=20=20=20=20
   1.0000000000000000=20=20=20=20=20
           4
           8

The only compiler I found having the same is PGI/NVIDIA.

OTOH ifort (and similarly sunf95, g95(!)) result in the expected:

   1.00000000000000=20=20=20=20=20
   1.00000000000000=20=20=20=20=20
           8
           8=