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/*
* 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);
}
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