From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by master.gitmailbox.com (Postfix) with ESMTP id 1EA79442B7 for ; Wed, 5 Oct 2022 16:13:01 +0000 (UTC) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id E4CBF68BD1B; Wed, 5 Oct 2022 19:12:59 +0300 (EEST) Received: from ursule.remlab.net (vps-a2bccee9.vps.ovh.net [51.75.19.47]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id C185B68BD11 for ; Wed, 5 Oct 2022 19:12:57 +0300 (EEST) Received: from basile.remlab.net (localhost [IPv6:::1]) by ursule.remlab.net (Postfix) with ESMTP id 5E571C0099 for ; Wed, 5 Oct 2022 19:12:57 +0300 (EEST) From: =?UTF-8?q?R=C3=A9mi=20Denis-Courmont?= To: ffmpeg-devel@ffmpeg.org Date: Wed, 5 Oct 2022 19:12:54 +0300 Message-Id: <20221005161256.27612-2-remi@remlab.net> X-Mailer: git-send-email 2.37.2 In-Reply-To: <12083658.O9o76ZdvQC@basile.remlab.net> References: <12083658.O9o76ZdvQC@basile.remlab.net> MIME-Version: 1.0 Subject: [FFmpeg-devel] [PATCH 2/4] lavu/riscv: helper macro for VTYPE encoding 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: ffmpeg-devel-bounces@ffmpeg.org Sender: "ffmpeg-devel" Archived-At: List-Archive: List-Post: On most cases, the vector type (VTYPE) for the RISC-V Vector extension is supplied as an immediate value, with either of the VSETVLI or VSETIVLI instructions. There is however a third instruction VSETVL which takes the vector type from a general purpose register. That is so the type can be selected at run-time. This introduces a macro to load a (valid) vector type into a register. The syntax follows that of VSETVLI and VSETIVLI, with element size, group multiplier, then tail and mask policies. --- libavutil/riscv/asm.S | 75 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/libavutil/riscv/asm.S b/libavutil/riscv/asm.S index ffa0bd9068..6ca74f263a 100644 --- a/libavutil/riscv/asm.S +++ b/libavutil/riscv/asm.S @@ -92,3 +92,78 @@ shnadd 3, \rd, \rs1, \rs2 .endm #endif + + /* Convenience macro to load a Vector type (vtype) as immediate */ + .macro lvtypei rd, e, m=m1, tp=tu, mp=mu + + .ifc \e,e8 + .equ ei, 0 + .else + .ifc \e,e16 + .equ ei, 8 + .else + .ifc \e,e32 + .equ ei, 16 + .else + .ifc \e,e64 + .equ ei, 24 + .else + .error "Unknown element type" + .endif + .endif + .endif + .endif + + .ifc \m,m1 + .equ mi, 0 + .else + .ifc \m,m2 + .equ mi, 1 + .else + .ifc \m,m4 + .equ mi, 2 + .else + .ifc \m,m8 + .equ mi, 3 + .else + .ifc \m,mf8 + .equ mi, 5 + .else + .ifc \m,mf4 + .equ mi, 6 + .else + .ifc \m,mf2 + .equ mi, 7 + .else + .error "Unknown multiplier" + .equ mi, 3 + .endif + .endif + .endif + .endif + .endif + .endif + .endif + + .ifc \tp,tu + .equ tpi, 0 + .else + .ifc \tp,ta + .equ tpi, 64 + .else + .error "Unknown tail policy" + .endif + .endif + + .ifc \mp,mu + .equ mpi, 0 + .else + .ifc \mp,ma + .equ mpi, 128 + .else + .error "Unknown mask policy" + .endif + .endif + + li \rd, (ei | mi | tpi | mpi) + .endm -- 2.37.2 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-devel To unsubscribe, visit link above, or email ffmpeg-devel-request@ffmpeg.org with subject "unsubscribe".