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https://git.ffmpeg.org/ffmpeg.git
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1e4ecf26f5
2.5% faster fft, 0.5% faster vorbis. Originally committed as revision 6023 to svn://svn.ffmpeg.org/ffmpeg/trunk
121 lines
3.8 KiB
C
121 lines
3.8 KiB
C
/*
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* FFT/MDCT transform with SSE optimizations
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* 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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static const int p1p1p1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 0, 1 << 31 };
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static const int p1p1m1p1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 0 };
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static const int p1p1m1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 1 << 31 };
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#if 0
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static void print_v4sf(const char *str, __m128 a)
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{
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float *p = (float *)&a;
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printf("%s: %f %f %f %f\n",
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str, p[0], p[1], p[2], p[3]);
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}
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#endif
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/* XXX: handle reverse case */
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void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
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{
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int ln = s->nbits;
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long i, j;
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long nblocks, nloops;
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FFTComplex *p, *cptr;
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asm volatile(
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"movaps %0, %%xmm4 \n\t"
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"movaps %1, %%xmm5 \n\t"
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::"m"(*p1p1m1m1),
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"m"(*(s->inverse ? p1p1m1p1 : p1p1p1m1))
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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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/* do the pass 0 butterfly */
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"movaps (%0,%1), %%xmm0 \n\t"
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"movaps %%xmm0, %%xmm1 \n\t"
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"shufps $0x4E, %%xmm0, %%xmm0 \n\t"
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"xorps %%xmm4, %%xmm1 \n\t"
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"addps %%xmm1, %%xmm0 \n\t"
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"movaps 16(%0,%1), %%xmm2 \n\t"
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"movaps %%xmm2, %%xmm3 \n\t"
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"shufps $0x4E, %%xmm2, %%xmm2 \n\t"
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"xorps %%xmm4, %%xmm3 \n\t"
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"addps %%xmm3, %%xmm2 \n\t"
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/* multiply third by -i */
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/* by toggling the sign bit */
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"shufps $0xB4, %%xmm2, %%xmm2 \n\t"
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"xorps %%xmm5, %%xmm2 \n\t"
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/* do the pass 1 butterfly */
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"movaps %%xmm0, %%xmm1 \n\t"
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"addps %%xmm2, %%xmm0 \n\t"
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"subps %%xmm2, %%xmm1 \n\t"
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"movaps %%xmm0, (%0,%1) \n\t"
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"movaps %%xmm1, 16(%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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"movaps (%2,%0), %%xmm1 \n\t"
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"movaps (%1,%0), %%xmm0 \n\t"
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"movaps %%xmm1, %%xmm2 \n\t"
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"shufps $0xA0, %%xmm1, %%xmm1 \n\t"
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"shufps $0xF5, %%xmm2, %%xmm2 \n\t"
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"mulps (%3,%0,2), %%xmm1 \n\t" // cre*re cim*re
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"mulps 16(%3,%0,2), %%xmm2 \n\t" // -cim*im cre*im
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"addps %%xmm2, %%xmm1 \n\t"
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"movaps %%xmm0, %%xmm3 \n\t"
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"addps %%xmm1, %%xmm0 \n\t"
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"subps %%xmm1, %%xmm3 \n\t"
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"movaps %%xmm0, (%1,%0) \n\t"
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"movaps %%xmm3, (%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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}
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