From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by sourceware.org (Postfix) with ESMTPS id EA8BD3858424 for ; Fri, 29 Jul 2022 11:50:06 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.1 sourceware.org EA8BD3858424 Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-27-Q3gxmPMpOLiowHXoDMNHvw-1; Fri, 29 Jul 2022 07:50:03 -0400 X-MC-Unique: Q3gxmPMpOLiowHXoDMNHvw-1 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.rdu2.redhat.com [10.11.54.2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 28A02811E7A for ; Fri, 29 Jul 2022 11:50:03 +0000 (UTC) Received: from tucnak.zalov.cz (unknown [10.39.192.41]) by smtp.corp.redhat.com (Postfix) with ESMTPS id DA348403D0E0; Fri, 29 Jul 2022 11:50:02 +0000 (UTC) Received: from tucnak.zalov.cz (localhost [127.0.0.1]) by tucnak.zalov.cz (8.17.1/8.17.1) with ESMTPS id 26TBnxOq235038 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NOT); Fri, 29 Jul 2022 13:50:00 +0200 Received: (from jakub@localhost) by tucnak.zalov.cz (8.17.1/8.17.1/Submit) id 26TBnxwm235037; Fri, 29 Jul 2022 13:49:59 +0200 Date: Fri, 29 Jul 2022 13:49:59 +0200 From: Jakub Jelinek To: Aldy Hernandez Cc: GCC Mailing List , "MacLeod, Andrew" Subject: Re: spaceship_replacement cannot see through simplified set of FP conditionals Message-ID: Reply-To: Jakub Jelinek References: MIME-Version: 1.0 In-Reply-To: X-Scanned-By: MIMEDefang 2.84 on 10.11.54.2 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, KAM_SHORT, RCVD_IN_DNSWL_LOW, SPF_HELO_NONE, SPF_NONE, TXREP autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: gcc@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jul 2022 11:50:08 -0000 On Fri, Jul 29, 2022 at 01:40:12PM +0200, Aldy Hernandez wrote: > With my upcoming patch enabling floating point VRP, > g++.dg/opt/pr94589-2.C is failing: > > https://gcc.gnu.org/pipermail/gcc-patches/2022-July/598788.html > > The problem is that phiopt no longer sees the following snippet, > because we have folded away the final conditional as true: > Could someone give me a hand here? Can spaceship_replacement easily be > adapted to handle this case, or should we be simplifying this > elsewhere? Leave it to me, once you commit, file a PR and I'll work on it. Jakub