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