On 10/19/2015 5:00 PM, Timothy Gu wrote: > --- > libavcodec/x86/Makefile | 1 + > libavcodec/x86/huffyuvencdsp.asm | 58 > ++++++++++++++++++++++++++++++++++++++ > libavcodec/x86/huffyuvencdsp_mmx.c | 37 ++++-------------------- > 3 files changed, 65 insertions(+), 31 deletions(-) > create mode 100644 libavcodec/x86/huffyuvencdsp.asm > > diff --git a/libavcodec/x86/Makefile b/libavcodec/x86/Makefile > index 4591e4b..e1b1f0c 100644 > --- a/libavcodec/x86/Makefile > +++ b/libavcodec/x86/Makefile > @@ -115,6 +115,7 @@ YASM-OBJS-$(CONFIG_H264QPEL) += > x86/h264_qpel_8bit.o \ > YASM-OBJS-$(CONFIG_HPELDSP) += x86/fpel.o \ > x86/hpeldsp.o > YASM-OBJS-$(CONFIG_HUFFYUVDSP) += x86/huffyuvdsp.o > +YASM-OBJS-$(CONFIG_HUFFYUVENCDSP) += x86/huffyuvencdsp.o > YASM-OBJS-$(CONFIG_IDCTDSP) += x86/idctdsp.o > YASM-OBJS-$(CONFIG_LLAUDDSP) += x86/lossless_audiodsp.o > YASM-OBJS-$(CONFIG_LLVIDDSP) += x86/lossless_videodsp.o > diff --git a/libavcodec/x86/huffyuvencdsp.asm > b/libavcodec/x86/huffyuvencdsp.asm > new file mode 100644 > index 0000000..97de7e9 > --- /dev/null > +++ b/libavcodec/x86/huffyuvencdsp.asm > @@ -0,0 +1,58 @@ > +;************************************************************************ > +;* SIMD-optimized HuffYUV encoding functions > +;* Copyright (c) 2000, 2001 Fabrice Bellard > +;* Copyright (c) 2002-2004 Michael Niedermayer <michae...@gmx.at> > +;* > +;* MMX optimization by Nick Kurshev <nickol...@mail.ru> > +;* Conversion to NASM format by Tiancheng "Timothy" Gu > <timothyg...@gmail.com> > +;* > +;* 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 > +;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 > USA > +;****************************************************************************** > + > +%include "libavutil/x86/x86util.asm" > + > +section .text > + > +INIT_MMX mmx > +; void ff_diff_bytes_mmx(uint8_t *dst, const uint8_t *src1, const uint8_t > *src2, > +; intptr_t w); > +cglobal diff_bytes, 4,6,0, dst, src1, src2, w, i > + xor iq, iq > + cmp wq, 16 > + jb .loop2 > + sub wq, 15
Check how this and the loop below are handled in ff_add_bytes (huffyuvdsp.asm). > +.loop: > + mova m0, [src2q + iq] > + mova m1, [src1q + iq] > + psubb m1, m0 _______________________________________________ ffmpeg-devel mailing list ffmpeg-devel@ffmpeg.org http://ffmpeg.org/mailman/listinfo/ffmpeg-devel
