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 F2077385ED4B; Tue,  4 Aug 2020 15:46:39 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org F2077385ED4B
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
 s=default; t=1596555999;
 bh=uVCsX5VVRoED6TpGueE9QjZuyJ7Bi/IILpcCovw++XE=;
 h=From:To:Subject:Date:In-Reply-To:References:From;
 b=T2PC6yJoEMoicDQrMzj+cY7j0XJbFy/P3lQo1HDMKacOWFpuIUqZRcQqqonW+t8QB
 9lut9fi5gdLyJgtxkejnYkzjODTumsZ3nU/mTHrD5c6hvfBKbtYjA5ODkSzuehs22b
 Ipxut5bl7BnrqvndulS17rrfuFVLi9PrrIq7dWIQ=
From: "schwab@linux-m68k.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/96373] SVE miscompilation on vectorized division loop,
 leading to FP exception
Date: Tue, 04 Aug 2020 15:46:39 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 10.2.1
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: schwab@linux-m68k.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: rsandifo at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-96373-4-Vlj3Xzd0PT@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-96373-4@http.gcc.gnu.org/bugzilla/>
References: <bug-96373-4@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: Tue, 04 Aug 2020 15:46:40 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96373

--- Comment #5 from Andreas Schwab <schwab@linux-m68k.org> ---
> Just note that _all_ floating point operations, not just divisions, can t=
rap
> (without fast-math).  You never know if the user enabled stops for any of
> the FP exceptions (overflow, underflow, inexact, invalid op, div-by-zero)=
.=20

You need #pragma STDC FENV_ACCESS ON for that, otherwise it's undefined
behaviour.=