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[79.124.17.100]) by mx.google.com with ESMTP id v30-20020a50a45e000000b0053f9ba36904si9370820edb.41.2023.11.10.07.44.05; Fri, 10 Nov 2023 07:44:05 -0800 (PST) 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 4C78F68CC04; Fri, 10 Nov 2023 17:44:03 +0200 (EET) 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 812FA68C83C for ; Fri, 10 Nov 2023 17:43:56 +0200 (EET) Received: from basile.remlab.net (localhost [IPv6:::1]) by ursule.remlab.net (Postfix) with ESMTP id 19469C0014 for ; Fri, 10 Nov 2023 17:43:56 +0200 (EET) From: =?utf-8?q?R=C3=A9mi_Denis-Courmont?= To: ffmpeg-devel@ffmpeg.org Date: Fri, 10 Nov 2023 17:43:54 +0200 Message-ID: <20231110154355.5011-1-remi@remlab.net> X-Mailer: git-send-email 2.42.0 MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCHv2 1/2] sws/rgb2rgb: rework R-V V YUY2 to 4:2:2 planar 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: Psn5DuUXXwfZ This saves three scratch registers and three instructions per line. The performance gains are mostly negligible. The main point is to free up registers for further rework. --- libswscale/riscv/rgb2rgb_rvv.S | 25 ++++++++++++------------- 1 file changed, 12 insertions(+), 13 deletions(-) diff --git a/libswscale/riscv/rgb2rgb_rvv.S b/libswscale/riscv/rgb2rgb_rvv.S index 671089c842..172f5918dc 100644 --- a/libswscale/riscv/rgb2rgb_rvv.S +++ b/libswscale/riscv/rgb2rgb_rvv.S @@ -127,31 +127,30 @@ func ff_deinterleave_bytes_rvv, zve32x endfunc .macro yuy2_to_i422p y_shift - addi a4, a4, 1 + slli t4, a4, 1 // pixel width -> (source) byte width lw t6, (sp) + sub a6, a6, a4 srai a4, a4, 1 // pixel width -> chroma width + sub a7, a7, a4 + sub t6, t6, t4 1: mv t4, a4 - mv t3, a3 - mv t0, a0 - mv t1, a1 - mv t2, a2 addi a5, a5, -1 2: vsetvli t5, t4, e8, m2, ta, ma - vlseg2e16.v v16, (t3) + vlseg2e16.v v16, (a3) sub t4, t4, t5 vnsrl.wi v24, v16, \y_shift // Y0 - sh2add t3, t5, t3 + sh2add a3, t5, a3 vnsrl.wi v26, v20, \y_shift // Y1 vnsrl.wi v28, v16, 8 - \y_shift // U vnsrl.wi v30, v20, 8 - \y_shift // V - vsseg2e8.v v24, (t0) - sh1add t0, t5, t0 - vse8.v v28, (t1) - add t1, t5, t1 - vse8.v v30, (t2) - add t2, t5, t2 + vsseg2e8.v v24, (a0) + sh1add a0, t5, a0 + vse8.v v28, (a1) + add a1, t5, a1 + vse8.v v30, (a2) + add a2, t5, a2 bnez t4, 2b add a3, a3, t6