From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id CE0DF3A71C1E; Fri, 23 Apr 2021 08:48:58 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org CE0DF3A71C1E From: "iains at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug target/100152] [10/11/12 Regression] used caller-saved register not preserved across a call. Date: Fri, 23 Apr 2021 08:48:58 +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: 10.3.0 X-Bugzilla-Keywords: ra, wrong-code X-Bugzilla-Severity: normal X-Bugzilla-Who: iains at gcc dot gnu.org X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P2 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 10.4 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: Fri, 23 Apr 2021 08:48:58 -0000 https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100152 --- Comment #32 from Iain Sandoe --- (In reply to Iain Sandoe from comment #31) > (In reply to Richard Biener from comment #30) > > (In reply to Iain Sandoe from comment #29) > > > what is also somewhat peculiar is that replacing the first function i= n the > > > reduced test case with "extern void ___UTF_8_put(char *a, int b);" ch= anges > > > the code-gen for the second function. > >=20 > > That might hint at IPA RA which you can try disabling via -fno-ipa-ra w= hich > > in turn hints at a target issue.=20=20 >=20 > yeah, it does switch back to using rbx, at least on the reduced test case. (also on the original). I wonder if the problem is that IPA can't "see" the lazy symbol resolver, s= o it just sees a call to ___UTF_8_put and doesn't know that this will be resolved indirectly. .. but something similar must apply to PLT and targets with linker veneers = ?=