From patchwork Sun Jan 27 00:44:13 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Niedermayer X-Patchwork-Id: 11869 Return-Path: X-Original-To: patchwork@ffaux-bg.ffmpeg.org Delivered-To: patchwork@ffaux-bg.ffmpeg.org Received: from ffbox0-bg.mplayerhq.hu (ffbox0-bg.ffmpeg.org [79.124.17.100]) by ffaux.localdomain (Postfix) with ESMTP id 050B444E3EA for ; Sun, 27 Jan 2019 02:45:19 +0200 (EET) Received: from [127.0.1.1] (localhost [127.0.0.1]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTP id 1F0A268AEA9; Sun, 27 Jan 2019 02:45:07 +0200 (EET) X-Original-To: ffmpeg-devel@ffmpeg.org Delivered-To: ffmpeg-devel@ffmpeg.org Received: from vie01a-dmta-pe06-2.mx.upcmail.net (vie01a-dmta-pe06-2.mx.upcmail.net [84.116.36.15]) by ffbox0-bg.mplayerhq.hu (Postfix) with ESMTPS id DFE4F68AEA3 for ; Sun, 27 Jan 2019 02:45:00 +0200 (EET) Received: from [172.31.216.235] (helo=vie01a-pemc-psmtp-pe12.mail.upcmail.net) by vie01a-dmta-pe06.mx.upcmail.net with esmtp (Exim 4.88) (envelope-from ) id 1gnYZc-00036I-0S for ffmpeg-devel@ffmpeg.org; Sun, 27 Jan 2019 01:45:20 +0100 Received: from localhost ([213.47.41.20]) by vie01a-pemc-psmtp-pe12.mail.upcmail.net with ESMTP id nYYdg2QQm2WSsnYYdgeY8Y; Sun, 27 Jan 2019 01:44:19 +0100 X-Env-Mailfrom: michael@niedermayer.cc X-Env-Rcptto: ffmpeg-devel@ffmpeg.org X-SourceIP: 213.47.41.20 X-CNFS-Analysis: v=2.3 cv=E7kcWpVl c=1 sm=1 tr=0 a=I1eytVlZLDX1BM2VTtTtSw==:117 a=I1eytVlZLDX1BM2VTtTtSw==:17 a=MKtGQD3n3ToA:10 a=1oJP67jkp3AA:10 a=GEAsPZ9sns4A:10 a=ZZnuYtJkoWoA:10 a=qwwjO6pALMasZYS89d0A:9 From: Michael Niedermayer To: FFmpeg development discussions and patches Date: Sun, 27 Jan 2019 01:44:13 +0100 Message-Id: <20190127004414.12662-1-michael@niedermayer.cc> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CMAE-Envelope: MS4wfG/MYAjS3bCAR4E/fiGr2WZWotgfhzUH6+l1gcx58HkWx+1vQaAyzU5SmF9VV6NR8YqdU+egRpCnbiWigOaYj35/qeLruh27KlUKnwxEWoVgYNFWOFDN sVv6cMQYnVGY4IcT8HpJcO0CspT3JzSBsP/Xl10TmNZkt7lajxTUxf5/ Subject: [FFmpeg-devel] [PATCH 1/2] avcodec/ffv1: Simplify fold() X-BeenThere: ffmpeg-devel@ffmpeg.org X-Mailman-Version: 2.1.20 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" No speed difference, or slightly faster (the difference is too small so it may be noise that this appears faster) Signed-off-by: Michael Niedermayer --- libavcodec/ffv1.h | 4 +--- 1 file changed, 1 insertion(+), 3 deletions(-) diff --git a/libavcodec/ffv1.h b/libavcodec/ffv1.h index 653138b070..7c29d01f51 100644 --- a/libavcodec/ffv1.h +++ b/libavcodec/ffv1.h @@ -153,9 +153,7 @@ static av_always_inline int fold(int diff, int bits) if (bits == 8) diff = (int8_t)diff; else { - diff += 1 << (bits - 1); - diff = av_mod_uintp2(diff, bits); - diff -= 1 << (bits - 1); + diff = sign_extend(diff, bits); } return diff;