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49 lines
1.6 KiB
NASM
49 lines
1.6 KiB
NASM
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;*****************************************************************************
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;* x86-optimized Float DSP functions
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;*
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;* Copyright 2016 James Almer
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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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;* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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;******************************************************************************
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%include "x86util.asm"
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SECTION .text
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;-----------------------------------------------------------------------------
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; void ff_butterflies_fixed(float *src0, float *src1, int len);
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;-----------------------------------------------------------------------------
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INIT_XMM sse2
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cglobal butterflies_fixed, 3,3,3, src0, src1, len
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shl lend, 2
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add src0q, lenq
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add src1q, lenq
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neg lenq
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align 16
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.loop:
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mova m0, [src0q + lenq]
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mova m1, [src1q + lenq]
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mova m2, m0
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paddd m0, m1
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psubd m2, m1
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mova [src0q + lenq], m0
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mova [src1q + lenq], m2
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add lenq, mmsize
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jl .loop
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RET
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