137 lines
3.8 KiB
C
137 lines
3.8 KiB
C
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/*
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* FFT/MDCT transform with Extended 3DNow! optimizations
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* Copyright (c) 2006 Zuxy MENG Jie.
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* Based on fft_sse.c copyright (c) 2002 Fabrice Bellard.
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*
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* This library 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 of the License, or (at your option) any later version.
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*
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* This library 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 this library; 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 "../dsputil.h"
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#include <math.h>
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#ifdef HAVE_MM3DNOW
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#include <mm3dnow.h>
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static const int p1m1[2] __attribute__((aligned(8))) =
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{ 0, 1 << 31 };
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static const int m1p1[2] __attribute__((aligned(8))) =
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{ 1 << 31, 0 };
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void ff_fft_calc_3dn2(FFTContext *s, FFTComplex *z)
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{
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int ln = s->nbits;
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int j, np, np2;
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int nblocks, nloops;
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register FFTComplex *p, *q;
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FFTComplex *cptr, *cptr1;
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int k;
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np = 1 << ln;
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/* FEMMS is not a must here but recommended by AMD */
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_m_femms();
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{
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__m64 *r, a0, a1, b0, b1, c;
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r = (__m64 *)&z[0];
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if (s->inverse)
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c = *(__m64 *)m1p1;
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else
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c = *(__m64 *)p1m1;
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j = (np >> 2);
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do {
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/* do the pass 0 butterfly */
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a0 = _m_pfadd(r[0], r[1]);
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a1 = _m_pfsub(r[0], r[1]);
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/* do the pass 0 butterfly */
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b0 = _m_pfadd(r[2], r[3]);
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b1 = _m_pfsub(r[2], r[3]);
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/* multiply third by -i */
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b1 = _m_pswapd(b1);
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b1 = _m_pxor(b1, c);
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r[0] = _m_pfadd(a0, b0);
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r[1] = _m_pfadd(a1, b1);
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r[2] = _m_pfsub(a0, b0);
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r[3] = _m_pfsub(a1, b1);
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r += 4;
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} while (--j != 0);
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}
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/* pass 2 .. ln-1 */
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nblocks = np >> 3;
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nloops = 1 << 2;
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np2 = np >> 1;
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cptr1 = s->exptab1;
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do {
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p = z;
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q = z + nloops;
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j = nblocks;
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do {
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cptr = cptr1;
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k = nloops >> 1;
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do {
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__m64 a0, a1, b0, b1, c0, c1, t10, t11, t20, t21;
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a0 = *(__m64 *)&p[0];
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a1 = *(__m64 *)&p[1];
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b0 = *(__m64 *)&q[0];
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b1 = *(__m64 *)&q[1];
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/* complex mul */
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c0 = *(__m64 *)&cptr[0];
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c1 = *(__m64 *)&cptr[1];
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/* cre*re cim*im */
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t10 = _m_pfmul(c0, b0);
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t11 = _m_pfmul(c1, b1);
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/* no need to access cptr[2] & cptr[3] */
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c0 = _m_pswapd(c0);
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c1 = _m_pswapd(c1);
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/* cim*re cre*im */
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t20 = _m_pfmul(c0, b0);
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t21 = _m_pfmul(c1, b1);
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/* cre*re-cim*im cim*re+cre*im */
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b0 = _m_pfpnacc(t10, t20);
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b1 = _m_pfpnacc(t11, t21);
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/* butterfly */
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*(__m64 *)&p[0] = _m_pfadd(a0, b0);
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*(__m64 *)&p[1] = _m_pfadd(a1, b1);
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*(__m64 *)&q[0] = _m_pfsub(a0, b0);
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*(__m64 *)&q[1] = _m_pfsub(a1, b1);
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p += 2;
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q += 2;
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cptr += 4;
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} while (--k);
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p += nloops;
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q += nloops;
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} while (--j);
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cptr1 += nloops * 2;
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nblocks = nblocks >> 1;
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nloops = nloops << 1;
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} while (nblocks != 0);
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_m_femms();
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}
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#endif
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