From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
	id A2F69385781F; Fri, 17 Feb 2023 14:33:04 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org A2F69385781F
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1676644384;
	bh=OLzAPagmh2p34NYsm4/+XUrR/hgY9GcCepCH1zyms2g=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=OCnYSEZWhlN0jqZxdBxnEPc0nkTBxX3DLGX9RW196XxW8jglpAaEu09TLXEutedzP
	 1QtXkmfoVzFGuv7wBinMfwcxF6U0uxtNMOR0+RFwa+PYkSWev84tlSz88/LYw9zZQ5
	 7QwEAaTdAG3Q2Kq9gMNyXd+5t7MFOG6T/HKQJIoQ=
From: "jakub at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug tree-optimization/90838] Detect table-based ctz implementation
Date: Fri, 17 Feb 2023 14:33:04 +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: 9.0
X-Bugzilla-Keywords: missed-optimization
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jakub at gcc dot gnu.org
X-Bugzilla-Status: RESOLVED
X-Bugzilla-Resolution: FIXED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: wilco at gcc dot gnu.org
X-Bugzilla-Target-Milestone: 10.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-90838-4-to3olmQmIY@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-90838-4@http.gcc.gnu.org/bugzilla/>
References: <bug-90838-4@http.gcc.gnu.org/bugzilla/>
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: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D90838

--- Comment #18 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
It is generally a win for cases where the condition can't be predicted, whi=
le
if it can, jumps are much better.  We have dozens or hundreds of PRs about =
this
in either direction on x86.=