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;******************************************************************************
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;* AAC Spectral Band Replication decoding functions
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;* Copyright (C) 2012 Christophe Gisquet <christophe.gisquet@gmail.com>
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;* This file is part of Libav.
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;* Libav 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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;* Libav 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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;* You should have received a copy of the GNU Lesser General Public
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;* License along with Libav; 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 "libavutil/x86/x86util.asm"
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; mask equivalent for multiply by -1.0 1.0
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ps_mask times 2 dd 1<<31, 0
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cglobal sbr_sum_square, 2, 3, 6
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; len is a multiple of 2, thus there are at least 4 elements to process
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cglobal sbr_hf_g_filt, 5, 6, 5
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lea r1, [r1 + 8*r4] ; offset by ixh elements into X_high
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movlps m0, [r2 + 4*r3 + 0]
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movlps m1, [r2 + 4*r3 + 8]
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movlps m2, [r1 + 0*STEP]
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movlps m3, [r1 + 2*STEP]
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movhps m2, [r1 + 1*STEP]
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movhps m3, [r1 + 3*STEP]
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movu [r0 + 8*r3 + 0], m0
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movu [r0 + 8*r3 + 16], m1
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and r5, 3 ; number of single element loops
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.loop1: ; element 0 and 1 can be computed at the same time
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; static void sbr_hf_gen_c(float (*X_high)[2], const float (*X_low)[2],
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; const float alpha0[2], const float alpha1[2],
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; float bw, int start, int end)
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cglobal sbr_hf_gen, 4,4,8, X_high, X_low, alpha0, alpha1, BW, S, E
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%if ARCH_X86_64 == 0 || WIN64
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mulps m2, bw ; (a1[0] a1[1])*bw
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mulps m1, bw ; (a0[0] a0[1])*bw = (a2 a3)
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mulps m2, bw ; (a1[0] a1[1])*bw*bw = (a0 a1)
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%if ARCH_X86_64 == 0 || WIN64
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; start and end 6th and 7th args on stack
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; BW does not actually occupy a register, so shift by 1
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sub start, end ; neg num of loops
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lea X_highq, [X_highq + end*2*4]
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lea X_lowq, [X_lowq + end*2*4 - 2*2*4]
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shl start, 3 ; offset from num loops
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mova m0, [X_lowq + start]
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movlhps m1, m1 ; (a2 a3 a2 a3)
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movlhps m2, m2 ; (a0 a1 a0 a1)
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shufps m3, m3, q0101 ; (a3 a2 a3 a2)
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shufps m4, m4, q0101 ; (a1 a0 a1 a0)
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xorps m3, m7 ; (-a3 a2 -a3 a2)
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xorps m4, m7 ; (-a1 a0 -a1 a0)
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shufps m0, m0, q2200 ; {Xl[-2][0],",Xl[-1][0],"}
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shufps m5, m5, q3311 ; {Xl[-2][1],",Xl[-1][1],"}
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mova m0, [X_lowq + start + 2*2*4]
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shufps m6, m0, q0022 ; {Xl[-1][0],",Xl[0][0],"}
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shufps m7, m0, q1133 ; {Xl[-1][1],",Xl[1][1],"}
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mova [X_highq + start], m5