From patchwork Mon Sep 12 15:53:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?R=C3=A9mi_Denis-Courmont?= X-Patchwork-Id: 37861 Delivered-To: ffmpegpatchwork2@gmail.com Received: by 2002:a05:6a20:3b1c:b0:96:9ee8:5cfd with SMTP id c28csp163087pzh; Mon, 12 Sep 2022 08:54:12 -0700 (PDT) X-Google-Smtp-Source: AA6agR7O69JTROczL2PZrPNs2fF5wplZ2vFwZxiIfkjyC6tdtbxS4pY5XQEGsIlvOzOXhI9Sum2H X-Received: by 2002:a17:906:cc4a:b0:779:ed37:b5a3 with SMTP id mm10-20020a170906cc4a00b00779ed37b5a3mr10768127ejb.626.1662998052242; Mon, 12 Sep 2022 08:54:12 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1662998052; cv=none; d=google.com; s=arc-20160816; b=zNLWRLdhB8n3GKbMkfB6zvsfOeB+I9GHRBu9l4D7KL/Ej8o+QeeuxND9aV5wJIPIh3 CljqzgjSoKBevaAft04pgwoCtjNjyuoYHvVIXCz6A+t1FAk33wgyNAZXpTQWQP96o58X +O30NItq77YueAAMwMLgNbhfaOYgn4E5n1DqHc5jgfVEdCba0ZBpjt5WwlcxhRwq9MZU zg+TTQlU1w/XHM0XRu6FJ7UkMN2WTbwdXrZ6qEirD2jIp27iB0YGMiWseAGDZnti2whE UoyduJEGg0vWrTeeRInMF8KJJj07hmOOQSPIdBC/5P5ytsYXqVzp4oc+BtuzCnorHI+M BgrQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=sender:errors-to:content-transfer-encoding:reply-to:list-subscribe :list-help:list-post:list-archive:list-unsubscribe:list-id :precedence:subject:mime-version:references:in-reply-to:message-id :date:to:from:delivered-to; bh=jVp59uuj9jWqE1sqKr9zVxd+9IcgkUK8L4g/icvyTF4=; b=ErTnEHSwr7e33LFSWro3NYw2Z9dhAbN9Vmg48PpQN3KTnpXPjX1EFPra0AVB+0Jbi3 Ib4hn1bfae2Pz/VNsls0Tm82Z2yO5MCKckwv/mozxnErf/46oVEfkAU24xNGXzBSXlqW 62l2UlBgrBIjP/tv5W82baONzhVv7DMDT78Vw7wl4M4DReCXItkMCxJC4to7CfXlLKe+ aPhtIKPVT3kHK1Huy/UAija51tVDglJbtGFd6AVO2KB05U3oQWB9Uxq5LCWuiYcvJXsK d4BCJ7StdeNCTvnv/Y6MyzYRCB2BtVu4UnUJCosYIuLGfhxFMrIP86kw6fJHoVqNVw1S aQfA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org. [79.124.17.100]) by mx.google.com with ESMTP id e16-20020a056402191000b0044fc3c0e505si8144176edz.318.2022.09.12.08.54.11; Mon, 12 Sep 2022 08:54:12 -0700 (PDT) Received-SPF: pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) client-ip=79.124.17.100; Authentication-Results: mx.google.com; spf=pass (google.com: domain of ffmpeg-devel-bounces@ffmpeg.org designates 79.124.17.100 as permitted sender) smtp.mailfrom=ffmpeg-devel-bounces@ffmpeg.org Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id C267A68BB55; Mon, 12 Sep 2022 18:53:44 +0300 (EEST) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from ursule.remlab.net (vps-a2bccee9.vps.ovh.net [51.75.19.47]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id ECD1868BB2E for ; Mon, 12 Sep 2022 18:53:34 +0300 (EEST) Received: from basile.remlab.net (localhost [IPv6:::1]) by ursule.remlab.net (Postfix) with ESMTP id 9DAD8C00B0 for ; Mon, 12 Sep 2022 18:53:34 +0300 (EEST) From: remi@remlab.net To: ffmpeg-devel@ffmpeg.org Date: Mon, 12 Sep 2022 18:53:19 +0300 Message-Id: <20220912155333.59843-4-remi@remlab.net> X-Mailer: git-send-email 2.37.2 In-Reply-To: <2652141.mvXUDI8C0e@basile.remlab.net> References: <2652141.mvXUDI8C0e@basile.remlab.net> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 04/18] lavu/riscv: byte-swap operations X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: FFmpeg development discussions and patches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Reply-To: FFmpeg development discussions and patches Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" X-TUID: LUTiQRs1F+ON From: Rémi Denis-Courmont If the target supports the Basic bit-manipulation (Zbb) extension, then the REV8 instruction is available to reverse byte order. Note that this instruction only exists at the "XLEN" register size, so we need to right shift the result down to the data width. If Zbb is not supported, then this patchset does nothing. Support for run-time detection is left for the future. Currently, there are no bits in auxv/ELF HWCAP for Z-extensions, so there are no clean ways to do this. --- libavutil/bswap.h | 2 ++ libavutil/riscv/bswap.h | 74 +++++++++++++++++++++++++++++++++++++++++ 2 files changed, 76 insertions(+) create mode 100644 libavutil/riscv/bswap.h diff --git a/libavutil/bswap.h b/libavutil/bswap.h index 91cb79538d..4840ab433f 100644 --- a/libavutil/bswap.h +++ b/libavutil/bswap.h @@ -40,6 +40,8 @@ # include "arm/bswap.h" #elif ARCH_AVR32 # include "avr32/bswap.h" +#elif ARCH_RISCV +# include "riscv/bswap.h" #elif ARCH_SH4 # include "sh4/bswap.h" #elif ARCH_X86 diff --git a/libavutil/riscv/bswap.h b/libavutil/riscv/bswap.h new file mode 100644 index 0000000000..de1429c0f7 --- /dev/null +++ b/libavutil/riscv/bswap.h @@ -0,0 +1,74 @@ +/* + * This file is part of FFmpeg. + * + * FFmpeg is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + * + * FFmpeg is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * Lesser General Public License for more details. + * + * You should have received a copy of the GNU Lesser General Public + * License along with FFmpeg; if not, write to the Free Software + * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA + */ + +#ifndef AVUTIL_RISCV_BSWAP_H +#define AVUTIL_RISCV_BSWAP_H + +#include +#include "config.h" +#include "libavutil/attributes.h" + +#if defined (__riscv_zbb) && (__riscv_zbb > 0) && HAVE_INLINE_ASM + +static av_always_inline av_const uintptr_t av_bswap_xlen(uintptr_t x) +{ + uintptr_t y; + + __asm__("rev8 %0, %1" : "=r" (y) : "r" (x)); + return y; +} + +#define av_bswap16 av_bswap16 + +static av_always_inline av_const uint_fast16_t av_bswap16(uint_fast16_t x) +{ + return av_bswap_xlen(x) >> (__riscv_xlen - 16); +} + +#if (__riscv_xlen == 32) +#define av_bswap32 av_bswap_xlen +#define av_bswap64 av_bswap64 + +static av_always_inline av_const uint64_t av_bswap64(uint64_t x) +{ + return (((uint64_t)av_bswap32(x)) << 32) | av_bswap32(x >> 32); +} + +#else +#define av_bswap32 av_bswap32 + +static av_always_inline av_const uint_fast32_t av_bswap32(uint_fast32_t x) +{ + return av_bswap_xlen(x) >> (__riscv_xlen - 32); +} + +#if (__riscv_xlen == 64) +#define av_bswap64 av_bswap_xlen + +#else +#define av_bswap64 av_bswap64 + +static av_always_inline av_const uint_fast64_t av_bswap64(uint_fast64_t x) +{ + return av_bswap_xlen(x) >> (__riscv_xlen - 64); +} + +#endif /* __riscv_xlen > 64 */ +#endif /* __riscv_xlen > 32 */ +#endif /* __riscv_zbb */ +#endif /* AVUTIL_RISCV_BSWAP_H */