From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id 13CAD3857C5D; Thu, 11 Nov 2021 18:46:21 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 13CAD3857C5D From: "acsawdey at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/103197] ppc inline expansion of memcpy/memmove should not use lxsibzx/stxsibx for a single byte Date: Thu, 11 Nov 2021 18:46:20 +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: 10.3.1 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: acsawdey at gcc dot gnu.org X-Bugzilla-Status: UNCONFIRMED 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: 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, 11 Nov 2021 18:46:21 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103197 --- Comment #1 from acsawdey at gcc dot gnu.org --- Looking at trunk, after expand we have this: (note 5 1 2 2 [bb 2] NOTE_INSN_BASIC_BLOCK) (insn 2 5 3 2 (set (reg/v/f:DI 117 [ a ]) (reg:DI 3 3 [ a ])) "bug2.c":3:1 -1 (nil)) (insn 3 2 4 2 (set (reg/v/f:DI 118 [ b ]) (reg:DI 4 4 [ b ])) "bug2.c":3:1 -1 (nil)) (note 4 3 7 2 NOTE_INSN_FUNCTION_BEG) (insn 7 4 9 2 (set (reg:DI 119) (mem:DI (reg/v/f:DI 118 [ b ]) [0 MEM [(void *)b_3(D)]+= 0 S8 A8])) "bug2.c":4:3 -1 (nil)) (insn 9 7 8 2 (set (reg:QI 120) (mem:QI (plus:DI (reg/v/f:DI 118 [ b ]) (const_int 8 [0x8])) [0 MEM [(void *)b_3(D)]+8 = S1 A8])) "bug2.c":4:3 -1 (nil)) (insn 8 9 10 2 (set (mem:DI (reg/v/f:DI 117 [ a ]) [0 MEM [(void *)a_2(D)]+0 S8 A8]) (reg:DI 119)) "bug2.c":4:3 -1 (nil)) (insn 10 8 0 2 (set (mem:QI (plus:DI (reg/v/f:DI 117 [ a ]) (const_int 8 [0x8])) [0 MEM [(void *)a_2(D)]+8 = S1 A8]) (reg:QI 120)) "bug2.c":4:3 -1 (nil)) Which is the expected code, DI and QI loads/stores that should produce D-fo= rm instructions. But it looks like reload put the QI into hard reg 32 which is a fp reg: (insn 9 17 8 2 (set (reg:QI 32 0 [orig:120 MEM [(void *)b_3(D)]= +8 ] [120]) (mem:QI (reg:DI 10 10 [124]) [0 MEM [(void *)b_3(D)]+8 = S1 A8])) "bug2.c":4:3 549 {*movqi_internal} which leads to the lxsibzx/stxsibx on output.=