From patchwork Thu May 13 22:06:53 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Tobias Burnus X-Patchwork-Id: 1478216 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org (client-ip=8.43.85.97; helo=sourceware.org; envelope-from=gcc-patches-bounces@gcc.gnu.org; receiver=) Received: from sourceware.org (server2.sourceware.org [8.43.85.97]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4Fh5Nr1q6Zz9sW1 for ; Fri, 14 May 2021 08:07:06 +1000 (AEST) Received: from server2.sourceware.org (localhost [IPv6:::1]) by sourceware.org (Postfix) with ESMTP id A26EB3847807; Thu, 13 May 2021 22:07:03 +0000 (GMT) X-Original-To: gcc-patches@gcc.gnu.org Delivered-To: gcc-patches@gcc.gnu.org Received: from esa2.mentor.iphmx.com (esa2.mentor.iphmx.com [68.232.141.98]) by sourceware.org (Postfix) with ESMTPS id E2192384802D for ; Thu, 13 May 2021 22:07:00 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.3.2 sourceware.org E2192384802D Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=codesourcery.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=Tobias_Burnus@mentor.com IronPort-SDR: GvcmHbZV7Xb9R/BzzDQFHLUvdroelm0uEs2tSdW+eBDlmOJb4zfz6EP1DqVAwpgYMDQJNFld5y 7R2vRKFcXwF6+QO2AnzwAzImX51Z+N8rsrdwr/82IxXdA6vjSYLN/EE5TeeUw0GMljVxqzYvcA oU1vNjgvqxhD2Patdyq+z1ClK9vntwGdqfUlR9xChPw4+b4TYnrtIaif0AzjeGLWkiCMdtEDhy NP2a+O7SXwYAyGFMovJGa0iVXuDYb+/xVIkrKK6F4zFAGmmR50m1fITP6PvkniftBeYtC3rdSC QZ0= X-IronPort-AV: E=Sophos;i="5.82,296,1613462400"; d="diff'?scan'208";a="61184888" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa2.mentor.iphmx.com with ESMTP; 13 May 2021 14:06:59 -0800 IronPort-SDR: Xro+jsZFOdZMa6ZuXpe6OMXMnVA+IDynXCwW7teAwa1V9ELoQM8RLnMPdw8+H01lQU/SfiuvU/ FwevvGhCxb7n/bHfVo0zsf9Xwrz/EIfGaLxS0iEPeU27kWR+U//nj4JQmhVVXiQEB7zaHdRsLg OBfTVX6Oan6vlManqSm3i5mWlkw1nmQP2oHmdPMyUh+Tn1DSWbN1aSWEbo3RvEBlT30/s1jlGv /auH9g4YOOfiQkt0xJBfAZ8gsPp1M/4w51HKx0wpZYkr1sHc0CLVS1h5cxycck80xyem1E5FMS ObM= To: gcc-patches , Gerald Pfeifer , Tom de Vries From: Tobias Burnus Subject: [wwwdocs, patch] gcc-12/changes.html: Document -mptx for nvptx Message-ID: <0b73f43a-1bc2-116b-9fcf-7eb356f5d9d3@codesourcery.com> Date: Fri, 14 May 2021 00:06:53 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 Content-Language: en-US X-Originating-IP: [137.202.0.90] X-ClientProxiedBy: svr-ies-mbx-02.mgc.mentorg.com (139.181.222.2) To svr-ies-mbx-01.mgc.mentorg.com (139.181.222.1) X-Spam-Status: No, score=-11.9 required=5.0 tests=BAYES_00, GIT_PATCH_0, HEADER_FROM_DIFFERENT_DOMAINS, KAM_DMARC_STATUS, KAM_SHORT, RCVD_IN_DNSWL_NONE, SPF_HELO_PASS, SPF_PASS, TXREP autolearn=ham autolearn_force=no version=3.4.2 X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on server2.sourceware.org X-BeenThere: gcc-patches@gcc.gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Gcc-patches mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: gcc-patches-bounces@gcc.gnu.org Sender: "Gcc-patches" Document this new flag, added in https://gcc.gnu.org/g:2a1586401a21dcd43e0f904bb6eec26c8b2f366b + https://gcc.gnu.org/onlinedocs/gcc/Nvidia-PTX-Options.html#index-mptx Any wording suggestions? Tobias PS: Some background remarks: (PTX ISA 3.1 is supported since NVidia's CUDA 5 while 6.3 is supported since CUDA 10.0 - and adds very useful new features; current is PTX ISA 7.3 (CUDA 11.3),* but on the PTX side, 6.3 adds a lot, >6.3 only few features, we still may want to support sometime in the future.) (The new flag paves the way for additional -misa= flags (i.e. newer hardware, relevant for enabling ptx instructions which only newer GPUs support) and newer GPU-hardware-independent PTX ISA features; hence, either permitting better code generation or for be used to fix bugs. While this will change during GCC 12, currently, the generated code is effectively the same with either -mptx= value.) (Regarding the produced instructions, the installed CUDA will JIT (and then cache) the GCC-generated nvptx in the binary at startup, optimizing for the available hardware - i.e. the chosen -mptx and available -misa do not restrict the hardware ability, just that PTX instructions which is only available in newer PTX / for newer hardware may not be generated.) (* Cf. https://docs.nvidia.com/cuda/parallel-thread-execution/index.html#release-notes__ptx-release-history ) ----------------- Mentor Graphics (Deutschland) GmbH, Arnulfstrasse 201, 80634 München Registergericht München HRB 106955, Geschäftsführer: Thomas Heurung, Frank Thürauf gcc-12/changes.html: Document -mptx for nvptx * htdocs/gcc-12/changes.html (nvptx): Document new -mptx flag. diff --git a/htdocs/gcc-12/changes.html b/htdocs/gcc-12/changes.html index 23f71411..6541cf4e 100644 --- a/htdocs/gcc-12/changes.html +++ b/htdocs/gcc-12/changes.html @@ -101,8 +101,13 @@ a work-in-progress.

- - +

NVPTX

+
    +
  • The -mptx flag has been added to specify the PTX ISA version + for the generated code; permitted values are 3.1 + (default and as used previous GCC versions) and 6.3. +
    • +