From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: by sourceware.org (Postfix, from userid 48) id A552838708CC; Thu, 23 Mar 2023 14:30:31 +0000 (GMT) DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A552838708CC DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org; s=default; t=1679581831; bh=OmzKgY95in/SAdS09pw1S7K1/fIFO9xf5v/UtyeRSrU=; h=From:To:Subject:Date:In-Reply-To:References:From; b=D9lYDhYDYUC9Px4a5YTxBbMEIjyDFbptgqQybsGJqIKFdwQjvKpIKY8OA1dvHmtFM q5G2TgQGVCIvpt1iiJDbS+KDcFFXOQ678ZlnEJoqHEDWCQ/vPP/pFtihLpEc9WjxxT q61kbeat+/zkCdQDfRNVUQZLYjXIlaemWH4qBXk4= From: "jakub at gcc dot gnu.org" To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/107569] [13 Regression] Failure to optimize std::isfinite since r13-3596 Date: Thu, 23 Mar 2023 14:30:31 +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: 13.0 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: P1 X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org X-Bugzilla-Target-Milestone: 13.0 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 List-Id: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D107569 --- Comment #49 from Jakub Jelinek --- Does the has_zero_uses patch work for this? As there is both: _4 =3D _6 u> 1.79769313486231570814527423731704356798070567525844996599e+= 308; _8 =3D ~_4; and _8 has_zero_uses while _4 has uses but all are dead. So, I assume we wouldn't try to reuse _8 but perhaps we'd reuse _4?=