From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 396FC3857C44; Tue, 11 Aug 2020 18:22:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 396FC3857C44 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1597170141; bh=vrHi9S9EtYYrJJ4ohAOllfDaooA8wCrb760d0rqWDoI=; h=From:To:Subject:Date:In-Reply-To:References:From; b=CUWTExvWMzprb9rTWhDMwy/dwBxTJH/om9cOQtQi8WM9GnqTiXxNNaHNWbuo3Rw3/ jyZ4AZtg6Y6s0ld5PMwpOzKokvtnhfE7Qj4nhaA6M/cFWG68iuHtKVF3apTbrbF7pC fXPF8QqFT6cYxNyywHh3Q3pSQ3sMgweBnfzlNOIw= From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/96573] [10/11 Regression] Regression in optimization on x86-64 with -O3 Date: Tue, 11 Aug 2020 18:22:21 +0000 X-Bugzilla-Reason: CC X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: gcc X-Bugzilla-Component: tree-optimization X-Bugzilla-Version: 10.2.0 X-Bugzilla-Keywords: missed-optimization X-Bugzilla-Severity: normal X-Bugzilla-Who: jakub at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 10.3 X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: everconfirmed cf_reconfirmed_on bug_status target_milestone cc component short_desc 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: Tue, 11 Aug 2020 18:22:21 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D96573 Jakub Jelinek changed: What |Removed |Added ---------------------------------------------------------------------------- Ever confirmed|0 |1 Last reconfirmed| |2020-08-11 Status|UNCONFIRMED |NEW Target Milestone|--- |10.3 CC| |jakub at gcc dot gnu.org Component|c |tree-optimization Summary|[Regression] Regression in |[10/11 Regression] |optimization on x86-64 with |Regression in optimization |-O3 from GCC 9 to 10 |on x86-64 with -O3 --- Comment #1 from Jakub Jelinek --- Stopped being recognized as bswap with r274922. That changed the IL before store-merging from _22 =3D MEM[(const uint8_t *)&pointer]; MEM[(uint8_t *)&newPointer + 7B] =3D _22; _33 =3D MEM[(const uint8_t *)&pointer + 1B]; MEM[(uint8_t *)&newPointer + 6B] =3D _33; _44 =3D MEM[(const uint8_t *)&pointer + 2B]; MEM[(uint8_t *)&newPointer + 5B] =3D _44; _55 =3D MEM[(const uint8_t *)&pointer + 3B]; MEM[(uint8_t *)&newPointer + 4B] =3D _55; _66 =3D MEM[(const uint8_t *)&pointer + 4B]; MEM[(uint8_t *)&newPointer + 3B] =3D _66; _77 =3D MEM[(const uint8_t *)&pointer + 5B]; MEM[(uint8_t *)&newPointer + 2B] =3D _77; _88 =3D MEM[(const uint8_t *)&pointer + 6B]; MEM[(uint8_t *)&newPointer + 1B] =3D _88; _5 =3D MEM[(const uint8_t *)&pointer + 7B]; MEM[(uint8_t *)&newPointer] =3D _5; _9 =3D newPointer; newPointer =3D{v} {CLOBBER}; return _9; to: _22 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 7B] =3D _22; _33 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 6B] =3D _33; _44 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 5B] =3D _44; _55 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 4B] =3D _55; _66 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 3B] =3D _66; _77 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 2B] =3D _77; _88 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer + 1B] =3D _88; _5 =3D BIT_FIELD_REF ; MEM[(uint8_t *)&newPointer] =3D _5; _9 =3D newPointer; newPointer =3D{v} {CLOBBER}; return _9; store merging has code to handle this, but punts on non-integral types (POINTER_TYPE_P in this case). Just changing: --- gcc/gimple-ssa-store-merging.c.jj 2020-07-28 15:39:09.909757589 +0200 +++ gcc/gimple-ssa-store-merging.c 2020-08-11 20:19:19.293299266 +0200 @@ -333,7 +333,8 @@ init_symbolic_number (struct symbolic_nu { int size; - if (! INTEGRAL_TYPE_P (TREE_TYPE (src))) + if (! INTEGRAL_TYPE_P (TREE_TYPE (src)) + && ! POINTER_TYPE_P (TREE_TYPE (src))) return false; n->base_addr =3D n->offset =3D n->alias_set =3D n->vuse =3D NULL_TREE; seems to work, though I must say I don't find much rationale for byte-swapp= ing pointers...=