74 lines
2.5 KiB
NASM
74 lines
2.5 KiB
NASM
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;************************************************************************
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;* SIMD-optimized HuffYUV encoding functions
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;* Copyright (c) 2000, 2001 Fabrice Bellard
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;* Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
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;*
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;* MMX optimization by Nick Kurshev <nickols_k@mail.ru>
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;* Conversion to NASM format by Tiancheng "Timothy" Gu <timothygu99@gmail.com>
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;*
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;* This file is part of FFmpeg.
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;*
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;* FFmpeg is free software; you can redistribute it and/or
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;* modify it under the terms of the GNU Lesser General Public
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;* License as published by the Free Software Foundation; either
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;* version 2.1 of the License, or (at your option) any later version.
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;*
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;* FFmpeg is distributed in the hope that it will be useful,
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;* but WITHOUT ANY WARRANTY; without even the implied warranty of
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;* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;* Lesser General Public License for more details.
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;*
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;* You should have received a copy of the GNU Lesser General Public
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;* License along with FFmpeg; if not, write to the Free Software
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;* 51, Inc., Foundation Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "libavutil/x86/x86util.asm"
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section .text
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INIT_MMX mmx
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; void ff_diff_bytes_mmx(uint8_t *dst, const uint8_t *src1, const uint8_t *src2,
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; intptr_t w);
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%if ARCH_X86_32
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cglobal diff_bytes, 3,5,2, dst, src1, src2
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%define wq r4q
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DECLARE_REG_TMP 3
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mov wq, r3mp
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%else
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cglobal diff_bytes, 4,5,2, dst, src1, src2, w
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DECLARE_REG_TMP 4
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%endif ; ARCH_X86_32
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%define i t0q
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mov i, wq
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and i, -2 * mmsize
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jz .setup_loop2
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add dstq, i
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add src1q, i
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add src2q, i
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neg i
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.loop:
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mova m0, [src1q + i]
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mova m1, [src1q + i + mmsize]
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psubb m0, [src2q + i]
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psubb m1, [src2q + i + mmsize]
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mova [dstq + i], m0
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mova [mmsize + dstq + i], m1
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add i, 2 * mmsize
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jl .loop
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.setup_loop2:
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and wq, 2 * mmsize - 1
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jz .end
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add dstq, wq
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add src1q, wq
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add src2q, wq
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neg wq
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.loop2:
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mov t0b, [src1q + wq]
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sub t0b, [src2q + wq]
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mov [dstq + wq], t0b
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inc wq
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jl .loop2
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.end:
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REP_RET
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