From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from eggs.gnu.org (eggs.gnu.org [IPv6:2001:470:142:3::10]) by sourceware.org (Postfix) with ESMTPS id A2AF63858D3C for ; Sat, 27 May 2023 22:03:14 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org A2AF63858D3C Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=nexgo.de Authentication-Results: sourceware.org; spf=fail smtp.mailfrom=nexgo.de Received: from mr6.vodafonemail.de ([145.253.228.166]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1q320G-0002z9-EW for gcc@gnu.org; Sat, 27 May 2023 18:03:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nexgo.de; s=vfde-smtpout-mb-15sep; t=1685224988; bh=sjtr6u/AYiin+BMx4l13lDwpMW/bCGUSUso8d4+n+vQ=; h=Message-ID:From:To:References:In-Reply-To:Subject:Date: Content-Type:X-Mailer:From; b=JHeoNRiRG7sYrrOfk2BSgQPq8hEp8VfmPg1TqbTfY/66wsCM8zuKcjW/tZsB1b+vA czwrVQOg7emvXcTy2cEsK44Rpfpt/08v6WElmKxWLsFJRWCCD/QIM+iI+ejdxRk+4f sdazVTcWOEytI/2KzITOSD4LlpjFUxAQ3EYOzEvw= Received: from smtp.vodafone.de (unknown [10.0.0.2]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by mr6.vodafonemail.de (Postfix) with ESMTPS id 4QTG4r5cBTz1y2K; Sat, 27 May 2023 22:03:08 +0000 (UTC) Received: from H270 (p5b38f631.dip0.t-ipconnect.de [91.56.246.49]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp.vodafone.de (Postfix) with ESMTPSA id 4QTG4f3bt9zMksK; Sat, 27 May 2023 22:02:55 +0000 (UTC) Message-ID: <71FF9C7056554132A16BCFD05CAB116C@H270> From: "Stefan Kanthak" To: "Andrew Pinski" Cc: "Jakub Jelinek" , References: <2A5397441B7D46C7928856D7AAF5836B@H270> <3E52AE4B49614D19BDC50FC79B8653F3@H270> In-Reply-To: Subject: Re: Another epic optimiser failure Date: Sun, 28 May 2023 00:00:41 +0200 Organization: Me, myself & IT MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Windows Mail 6.0.6002.18197 X-MimeOLE: Produced By Microsoft MimeOLE V6.1.7601.24158 X-purgate-type: clean X-purgate: clean X-purgate-size: 1252 X-purgate-ID: 155817::1685224984-9EFFC4B9-F759EFDD/0/0 Received-SPF: pass client-ip=145.253.228.166; envelope-from=stefan.kanthak@nexgo.de; helo=mr6.vodafonemail.de X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,DKIM_VALID_EF=-0.1,RCVD_IN_DNSWL_LOW=-0.7,SPF_HELO_NONE=0.001,SPF_PASS=-0.001,T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-Spam-Status: No, score=-2.4 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,KAM_SHORT,SPF_FAIL,SPF_HELO_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: "Andrew Pinski" wrote: > On Sat, May 27, 2023 at 2:38 PM Stefan Kanthak wrote: >> >> "Jakub Jelinek" wrote, completely clueless: >> >>> On Sat, May 27, 2023 at 11:04:11PM +0200, Stefan Kanthak wrote: >>>> OUCH: popcnt writes the WHOLE result register, there is ABSOLUTELY >>>> no need to clear it beforehand nor to clear the higher 24 bits >>>> afterwards! >>> >>> Except that there is. See https://gcc.gnu.org/PR62011 for details. >> >> GUESS WHY I EXPLICITLY WROTE >> >> | JFTR: before GCC zealots write nonsense: see -march= or -mtune= >> >> NOT AMUSED ABOUT YOUR CRYING INCOMPETENCE! > > So you want to complain about GCC knowing about an Intel performance errata???? Ever heard about cargo cult? Read the options I used CAREFULLY | gcc -m32 -march=alderlake -O3 | gcc -m32 -march=sapphirerapids -O3 | gcc -m32 -mpopcnt -mtune=sapphirerapids -O3 > If you read that bug report, you would have learned why the zeroing is > done. I am sorry you hate GCC for actually following advice from the > processor maker after all. HSD146 does NOT apply to Alder Lake or Sapphire Rapids! NOT AMUSED ABOUT YOUR INCOMPETENCE TOO! Stefan