mirror of
https://github.com/FFmpeg/FFmpeg.git
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129 lines
4.3 KiB
C
129 lines
4.3 KiB
C
/*
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* FFT/MDCT transform with 3DNow! optimizations
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* Copyright (c) 2006 Zuxy MENG Jie, Loren Merritt
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* Based on fft_sse.c copyright (c) 2002 Fabrice Bellard.
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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 "libavutil/x86_cpu.h"
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#include "libavcodec/dsputil.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_3dn(FFTContext *s, FFTComplex *z)
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{
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int ln = s->nbits;
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long j;
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x86_reg i;
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long nblocks, nloops;
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FFTComplex *p, *cptr;
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asm volatile(
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/* FEMMS is not a must here but recommended by AMD */
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"femms \n\t"
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"movq %0, %%mm7 \n\t"
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::"m"(*(s->inverse ? m1p1 : p1m1))
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);
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i = 8 << ln;
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asm volatile(
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"1: \n\t"
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"sub $32, %0 \n\t"
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"movq (%0,%1), %%mm0 \n\t"
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"movq 16(%0,%1), %%mm1 \n\t"
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"movq 8(%0,%1), %%mm2 \n\t"
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"movq 24(%0,%1), %%mm3 \n\t"
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"movq %%mm0, %%mm4 \n\t"
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"movq %%mm1, %%mm5 \n\t"
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"pfadd %%mm2, %%mm0 \n\t"
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"pfadd %%mm3, %%mm1 \n\t"
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"pfsub %%mm2, %%mm4 \n\t"
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"pfsub %%mm3, %%mm5 \n\t"
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"movq %%mm0, %%mm2 \n\t"
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"punpckldq %%mm5, %%mm6 \n\t"
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"punpckhdq %%mm6, %%mm5 \n\t"
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"movq %%mm4, %%mm3 \n\t"
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"pxor %%mm7, %%mm5 \n\t"
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"pfadd %%mm1, %%mm0 \n\t"
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"pfadd %%mm5, %%mm4 \n\t"
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"pfsub %%mm1, %%mm2 \n\t"
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"pfsub %%mm5, %%mm3 \n\t"
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"movq %%mm0, (%0,%1) \n\t"
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"movq %%mm4, 8(%0,%1) \n\t"
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"movq %%mm2, 16(%0,%1) \n\t"
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"movq %%mm3, 24(%0,%1) \n\t"
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"jg 1b \n\t"
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:"+r"(i)
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:"r"(z)
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);
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/* pass 2 .. ln-1 */
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nblocks = 1 << (ln-3);
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nloops = 1 << 2;
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cptr = s->exptab1;
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do {
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p = z;
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j = nblocks;
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do {
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i = nloops*8;
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asm volatile(
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"1: \n\t"
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"sub $16, %0 \n\t"
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"movq (%1,%0), %%mm0 \n\t"
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"movq 8(%1,%0), %%mm1 \n\t"
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"movq (%2,%0), %%mm2 \n\t"
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"movq 8(%2,%0), %%mm3 \n\t"
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"movq %%mm2, %%mm4 \n\t"
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"movq %%mm3, %%mm5 \n\t"
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"punpckldq %%mm2, %%mm2 \n\t"
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"punpckldq %%mm3, %%mm3 \n\t"
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"punpckhdq %%mm4, %%mm4 \n\t"
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"punpckhdq %%mm5, %%mm5 \n\t"
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"pfmul (%3,%0,2), %%mm2 \n\t" // cre*re cim*re
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"pfmul 8(%3,%0,2), %%mm3 \n\t"
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"pfmul 16(%3,%0,2), %%mm4 \n\t" // -cim*im cre*im
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"pfmul 24(%3,%0,2), %%mm5 \n\t"
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"pfadd %%mm2, %%mm4 \n\t" // cre*re-cim*im cim*re+cre*im
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"pfadd %%mm3, %%mm5 \n\t"
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"movq %%mm0, %%mm2 \n\t"
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"movq %%mm1, %%mm3 \n\t"
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"pfadd %%mm4, %%mm0 \n\t"
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"pfadd %%mm5, %%mm1 \n\t"
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"pfsub %%mm4, %%mm2 \n\t"
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"pfsub %%mm5, %%mm3 \n\t"
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"movq %%mm0, (%1,%0) \n\t"
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"movq %%mm1, 8(%1,%0) \n\t"
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"movq %%mm2, (%2,%0) \n\t"
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"movq %%mm3, 8(%2,%0) \n\t"
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"jg 1b \n\t"
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:"+r"(i)
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:"r"(p), "r"(p + nloops), "r"(cptr)
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);
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p += nloops*2;
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} while (--j);
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cptr += nloops*2;
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nblocks >>= 1;
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nloops <<= 1;
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} while (nblocks != 0);
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asm volatile("femms");
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}
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