215 lines
7.0 KiB
C
215 lines
7.0 KiB
C
/*
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* FFT/MDCT transform with Extended 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_3dn2(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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"pswapd %%mm5, %%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 (%3,%0,2), %%mm4 \n\t"
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"movq 8(%3,%0,2), %%mm5 \n\t"
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"pswapd %%mm4, %%mm6 \n\t" // no need for cptr[2] & cptr[3]
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"pswapd %%mm5, %%mm7 \n\t"
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"pfmul %%mm2, %%mm4 \n\t" // cre*re cim*im
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"pfmul %%mm3, %%mm5 \n\t"
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"pfmul %%mm2, %%mm6 \n\t" // cim*re cre*im
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"pfmul %%mm3, %%mm7 \n\t"
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"pfpnacc %%mm6, %%mm4 \n\t" // cre*re-cim*im cim*re+cre*im
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"pfpnacc %%mm7, %%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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void ff_imdct_calc_3dn2(MDCTContext *s, FFTSample *output,
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const FFTSample *input, FFTSample *tmp)
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{
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long n8, n4, n2, n;
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x86_reg k;
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const uint16_t *revtab = s->fft.revtab;
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const FFTSample *tcos = s->tcos;
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const FFTSample *tsin = s->tsin;
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const FFTSample *in1, *in2;
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FFTComplex *z = (FFTComplex *)tmp;
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n = 1 << s->nbits;
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n2 = n >> 1;
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n4 = n >> 2;
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n8 = n >> 3;
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/* pre rotation */
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in1 = input;
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in2 = input + n2 - 1;
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for(k = 0; k < n4; k++) {
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// FIXME a single block is faster, but gcc 2.95 and 3.4.x on 32bit can't compile it
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asm volatile(
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"movd %0, %%mm0 \n\t"
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"movd %2, %%mm1 \n\t"
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"punpckldq %1, %%mm0 \n\t"
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"punpckldq %3, %%mm1 \n\t"
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"movq %%mm0, %%mm2 \n\t"
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"pfmul %%mm1, %%mm0 \n\t"
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"pswapd %%mm1, %%mm1 \n\t"
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"pfmul %%mm1, %%mm2 \n\t"
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"pfpnacc %%mm2, %%mm0 \n\t"
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::"m"(in2[-2*k]), "m"(in1[2*k]),
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"m"(tcos[k]), "m"(tsin[k])
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);
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asm volatile(
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"movq %%mm0, %0 \n\t"
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:"=m"(z[revtab[k]])
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);
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}
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ff_fft_calc(&s->fft, z);
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/* post rotation + reordering */
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for(k = 0; k < n4; k++) {
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asm volatile(
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"movq %0, %%mm0 \n\t"
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"movd %1, %%mm1 \n\t"
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"punpckldq %2, %%mm1 \n\t"
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"movq %%mm0, %%mm2 \n\t"
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"pfmul %%mm1, %%mm0 \n\t"
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"pswapd %%mm1, %%mm1 \n\t"
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"pfmul %%mm1, %%mm2 \n\t"
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"pfpnacc %%mm2, %%mm0 \n\t"
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"movq %%mm0, %0 \n\t"
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:"+m"(z[k])
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:"m"(tcos[k]), "m"(tsin[k])
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);
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}
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k = n-8;
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asm volatile("movd %0, %%mm7" ::"r"(1<<31));
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asm volatile(
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"1: \n\t"
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"movq (%4,%0), %%mm0 \n\t" // z[n8+k]
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"neg %0 \n\t"
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"pswapd -8(%4,%0), %%mm1 \n\t" // z[n8-1-k]
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"movq %%mm0, %%mm2 \n\t"
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"pxor %%mm7, %%mm2 \n\t"
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"punpckldq %%mm1, %%mm2 \n\t"
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"pswapd %%mm2, %%mm3 \n\t"
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"punpckhdq %%mm1, %%mm0 \n\t"
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"pswapd %%mm0, %%mm4 \n\t"
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"pxor %%mm7, %%mm0 \n\t"
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"pxor %%mm7, %%mm4 \n\t"
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"movq %%mm3, -8(%3,%0) \n\t" // output[n-2-2*k] = { z[n8-1-k].im, -z[n8+k].re }
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"movq %%mm4, -8(%2,%0) \n\t" // output[n2-2-2*k]= { -z[n8-1-k].re, z[n8+k].im }
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"neg %0 \n\t"
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"movq %%mm0, (%1,%0) \n\t" // output[2*k] = { -z[n8+k].im, z[n8-1-k].re }
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"movq %%mm2, (%2,%0) \n\t" // output[n2+2*k] = { -z[n8+k].re, z[n8-1-k].im }
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"sub $8, %0 \n\t"
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"jge 1b \n\t"
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:"+r"(k)
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:"r"(output), "r"(output+n2), "r"(output+n), "r"(z+n8)
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:"memory"
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);
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asm volatile("femms");
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}
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