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 18AB538582A1; Tue,  5 Jul 2022 07:46:34 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 18AB538582A1
From: "jan.wassenberg at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/106187] armhf: Miscompilation at O2 level (O0 / O1 are
 working)
Date: Tue, 05 Jul 2022 07:46:33 +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: 10.4.0
X-Bugzilla-Keywords: wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jan.wassenberg at gmail dot com
X-Bugzilla-Status: WAITING
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-106187-4-S6ywYvqRIV@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-106187-4@http.gcc.gnu.org/bugzilla/>
References: <bug-106187-4@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, 05 Jul 2022 07:46:34 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D106187

--- Comment #7 from Jan Wassenberg <jan.wassenberg at gmail dot com> ---
The easiest way to reduce the amount of code in the binary is to comment out
from mul_test.cc all the HWY_EXPORT_AND_TEST_P except the one with
TestAllMulEven.

The actual miscompilation is probably happening within ops/emu128-inl.h.

You can further reduce instantiations by replacing
ForFloatTypes(ForPartialVectors<TestMulAdd>());
with
TestMulAdd()(float(), FixedTag<float, 4>());

That gets us down to a fairly minimal single TU (mul_test.cc).=