From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 499F63858D1E; Thu, 10 Feb 2022 23:38:58 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 499F63858D1E From: "dmalcolm at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug analyzer/104274] FAIL: gcc.dg/analyzer/pr97029.c (test for excess errors) Date: Thu, 10 Feb 2022 23:38:58 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: analyzer X-Bugzilla-Version: 12.0 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: dmalcolm at gcc dot gnu.org X-Bugzilla-Status: ASSIGNED X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: dmalcolm at gcc dot gnu.org X-Bugzilla-Target-Milestone: --- X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: Message-ID: In-Reply-To: References: 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 10 Feb 2022 23:38:58 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D104274 --- Comment #2 from David Malcolm --- In gimplify_parameters: x86_64: (gdb) p data.arg $2 =3D {type =3D , mode =3D E_BLKmode, named= =3D 1, pass_by_reference =3D 0} hppa64-hpux11.3: (gdb) p data.arg $29 =3D {type =3D , mode =3D E_DImode, named = =3D 1, pass_by_reference =3D 1} so this seems to only be happening for empty structs, when passing them by reference. Specifically, for both targets we reach: VVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVVV= V=20=20=20=20 Breakpoint 12, pass_by_reference (ca=3D0x7fffffffd860, arg=3D...) at ../../src/gcc/calls.cc:921 921 return targetm.calls.pass_by_reference (pack_cumulative_args (ca), arg); ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ and on pa, size =3D=3D 0, so we pass by reference: 6367 static bool 6368 pa_pass_by_reference (cumulative_args_t, const function_arg_info &a= rg) 6369 { 6370 HOST_WIDE_INT size =3D arg.type_size_in_bytes (); 6371 if (TARGET_64BIT) 6372 return size <=3D 0; 6373 else 6374 return size <=3D 0 || size > 8; 6375 } whereas on x86_64, ix86_pass_by_reference returns false.=