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- ;******************************************************************************
- ;* x86 optimized dithering format conversion
- ;* Copyright (c) 2012 Justin Ruggles <justin.ruggles@gmail.com>
- ;*
- ;* This file is part of Libav.
- ;*
- ;* Libav 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.
- ;*
- ;* Libav 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 Libav; if not, write to the Free Software
- ;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- ;******************************************************************************
-
- %include "libavutil/x86/x86util.asm"
-
- SECTION_RODATA 32
-
- pf_s16_scale: times 4 dd 32753.0
-
- SECTION_TEXT
-
- ;------------------------------------------------------------------------------
- ; void ff_quantize(int16_t *dst, float *src, float *dither, int len);
- ;------------------------------------------------------------------------------
-
- INIT_XMM sse2
- cglobal quantize, 4,4,3, dst, src, dither, len
- lea lenq, [2*lend]
- add dstq, lenq
- lea srcq, [srcq+2*lenq]
- lea ditherq, [ditherq+2*lenq]
- neg lenq
- mova m2, [pf_s16_scale]
- .loop:
- mulps m0, m2, [srcq+2*lenq]
- mulps m1, m2, [srcq+2*lenq+mmsize]
- addps m0, [ditherq+2*lenq]
- addps m1, [ditherq+2*lenq+mmsize]
- cvtps2dq m0, m0
- cvtps2dq m1, m1
- packssdw m0, m1
- mova [dstq+lenq], m0
- add lenq, mmsize
- jl .loop
- REP_RET
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