mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-24 08:12:44 +00:00
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
/*
|
|
* FFT/MDCT transform with SSE optimizations
|
|
* Copyright (c) 2002 Fabrice Bellard.
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*/
|
|
#include "../dsputil.h"
|
|
|
|
static const int p1p1p1m1[4] __attribute__((aligned(16))) =
|
|
{ 0, 0, 0, 1 << 31 };
|
|
|
|
static const int p1p1m1p1[4] __attribute__((aligned(16))) =
|
|
{ 0, 0, 1 << 31, 0 };
|
|
|
|
static const int p1p1m1m1[4] __attribute__((aligned(16))) =
|
|
{ 0, 0, 1 << 31, 1 << 31 };
|
|
|
|
#if 0
|
|
static void print_v4sf(const char *str, __m128 a)
|
|
{
|
|
float *p = (float *)&a;
|
|
printf("%s: %f %f %f %f\n",
|
|
str, p[0], p[1], p[2], p[3]);
|
|
}
|
|
#endif
|
|
|
|
/* XXX: handle reverse case */
|
|
void ff_fft_calc_sse(FFTContext *s, FFTComplex *z)
|
|
{
|
|
int ln = s->nbits;
|
|
long i, j;
|
|
long nblocks, nloops;
|
|
FFTComplex *p, *cptr;
|
|
|
|
asm volatile(
|
|
"movaps %0, %%xmm4 \n\t"
|
|
"movaps %1, %%xmm5 \n\t"
|
|
::"m"(*p1p1m1m1),
|
|
"m"(*(s->inverse ? p1p1m1p1 : p1p1p1m1))
|
|
);
|
|
|
|
i = 8 << ln;
|
|
asm volatile(
|
|
"1: \n\t"
|
|
"sub $32, %0 \n\t"
|
|
/* do the pass 0 butterfly */
|
|
"movaps (%0,%1), %%xmm0 \n\t"
|
|
"movaps %%xmm0, %%xmm1 \n\t"
|
|
"shufps $0x4E, %%xmm0, %%xmm0 \n\t"
|
|
"xorps %%xmm4, %%xmm1 \n\t"
|
|
"addps %%xmm1, %%xmm0 \n\t"
|
|
"movaps 16(%0,%1), %%xmm2 \n\t"
|
|
"movaps %%xmm2, %%xmm3 \n\t"
|
|
"shufps $0x4E, %%xmm2, %%xmm2 \n\t"
|
|
"xorps %%xmm4, %%xmm3 \n\t"
|
|
"addps %%xmm3, %%xmm2 \n\t"
|
|
/* multiply third by -i */
|
|
/* by toggling the sign bit */
|
|
"shufps $0xB4, %%xmm2, %%xmm2 \n\t"
|
|
"xorps %%xmm5, %%xmm2 \n\t"
|
|
/* do the pass 1 butterfly */
|
|
"movaps %%xmm0, %%xmm1 \n\t"
|
|
"addps %%xmm2, %%xmm0 \n\t"
|
|
"subps %%xmm2, %%xmm1 \n\t"
|
|
"movaps %%xmm0, (%0,%1) \n\t"
|
|
"movaps %%xmm1, 16(%0,%1) \n\t"
|
|
"jg 1b \n\t"
|
|
:"+r"(i)
|
|
:"r"(z)
|
|
);
|
|
/* pass 2 .. ln-1 */
|
|
|
|
nblocks = 1 << (ln-3);
|
|
nloops = 1 << 2;
|
|
cptr = s->exptab1;
|
|
do {
|
|
p = z;
|
|
j = nblocks;
|
|
do {
|
|
i = nloops*8;
|
|
asm volatile(
|
|
"1: \n\t"
|
|
"sub $16, %0 \n\t"
|
|
"movaps (%2,%0), %%xmm1 \n\t"
|
|
"movaps (%1,%0), %%xmm0 \n\t"
|
|
"movaps %%xmm1, %%xmm2 \n\t"
|
|
"shufps $0xA0, %%xmm1, %%xmm1 \n\t"
|
|
"shufps $0xF5, %%xmm2, %%xmm2 \n\t"
|
|
"mulps (%3,%0,2), %%xmm1 \n\t" // cre*re cim*re
|
|
"mulps 16(%3,%0,2), %%xmm2 \n\t" // -cim*im cre*im
|
|
"addps %%xmm2, %%xmm1 \n\t"
|
|
"movaps %%xmm0, %%xmm3 \n\t"
|
|
"addps %%xmm1, %%xmm0 \n\t"
|
|
"subps %%xmm1, %%xmm3 \n\t"
|
|
"movaps %%xmm0, (%1,%0) \n\t"
|
|
"movaps %%xmm3, (%2,%0) \n\t"
|
|
"jg 1b \n\t"
|
|
:"+r"(i)
|
|
:"r"(p), "r"(p + nloops), "r"(cptr)
|
|
);
|
|
p += nloops*2;
|
|
} while (--j);
|
|
cptr += nloops*2;
|
|
nblocks >>= 1;
|
|
nloops <<= 1;
|
|
} while (nblocks != 0);
|
|
}
|
|
|