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ffmpeg/libavcodec/mips/fft_mips.c
Nedeljko Babic 18d7074b4e libavcodec: Implementation of 32 bit fixed point FFT 
Iterative implementation of 32 bit fixed point split-radix FFT.
Max FFT that can be calculated currently is 2^12.

Signed-off-by: Nedeljko Babic <nbabic@mips.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
2013-08-04 14:01:41 +02:00

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/*
* Copyright (c) 2012
* MIPS Technologies, Inc., California.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the MIPS Technologies, Inc., nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE MIPS TECHNOLOGIES, INC. ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE MIPS TECHNOLOGIES, INC. BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Author: Stanislav Ocovaj (socovaj@mips.com)
* Author: Zoran Lukic (zoranl@mips.com)
*
* Optimized MDCT/IMDCT and FFT transforms
*
* This file is part of FFmpeg.
*
* FFmpeg 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 2.1 of the License, or (at your option) any later version.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#include "libavcodec/fft.h"
#include "libavcodec/fft_table.h"
/**
* FFT transform
*/
#if HAVE_INLINE_ASM
static void ff_fft_calc_mips(FFTContext *s, FFTComplex *z)
{
int nbits, i, n, num_transforms, offset, step;
int n4, n2, n34;
FFTSample tmp1, tmp2, tmp3, tmp4, tmp5, tmp6, tmp7, tmp8;
FFTComplex *tmpz;
float w_re, w_im;
float *w_re_ptr, *w_im_ptr;
const int fft_size = (1 << s->nbits);
int s_n = s->nbits;
int tem1, tem2;
float pom, pom1, pom2, pom3;
float temp, temp1, temp3, temp4;
FFTComplex * tmpz_n2, * tmpz_n34, * tmpz_n4;
FFTComplex * tmpz_n2_i, * tmpz_n34_i, * tmpz_n4_i, * tmpz_i;
/**
*num_transforms = (0x2aab >> (16 - s->nbits)) | 1;
*/
__asm__ volatile (
"li %[tem1], 16 \n\t"
"sub %[s_n], %[tem1], %[s_n] \n\t"
"li %[tem2], 10923 \n\t"
"srav %[tem2], %[tem2], %[s_n] \n\t"
"ori %[num_t],%[tem2], 1 \n\t"
: [num_t]"=r"(num_transforms), [s_n]"+r"(s_n),
[tem1]"=&r"(tem1), [tem2]"=&r"(tem2)
);
for (n=0; n<num_transforms; n++) {
offset = fft_offsets_lut[n] << 2;
tmpz = z + offset;
tmp1 = tmpz[0].re + tmpz[1].re;
tmp5 = tmpz[2].re + tmpz[3].re;
tmp2 = tmpz[0].im + tmpz[1].im;
tmp6 = tmpz[2].im + tmpz[3].im;
tmp3 = tmpz[0].re - tmpz[1].re;
tmp8 = tmpz[2].im - tmpz[3].im;
tmp4 = tmpz[0].im - tmpz[1].im;
tmp7 = tmpz[2].re - tmpz[3].re;
tmpz[0].re = tmp1 + tmp5;
tmpz[2].re = tmp1 - tmp5;
tmpz[0].im = tmp2 + tmp6;
tmpz[2].im = tmp2 - tmp6;
tmpz[1].re = tmp3 + tmp8;
tmpz[3].re = tmp3 - tmp8;
tmpz[1].im = tmp4 - tmp7;
tmpz[3].im = tmp4 + tmp7;
}
if (fft_size < 8)
return;
num_transforms = (num_transforms >> 1) | 1;
for (n=0; n<num_transforms; n++) {
offset = fft_offsets_lut[n] << 3;
tmpz = z + offset;
__asm__ volatile (
"lwc1 %[tmp1], 32(%[tmpz]) \n\t"
"lwc1 %[pom], 40(%[tmpz]) \n\t"
"lwc1 %[tmp3], 48(%[tmpz]) \n\t"
"lwc1 %[pom1], 56(%[tmpz]) \n\t"
"lwc1 %[tmp2], 36(%[tmpz]) \n\t"
"lwc1 %[pom2], 44(%[tmpz]) \n\t"
"lwc1 %[pom3], 60(%[tmpz]) \n\t"
"lwc1 %[tmp4], 52(%[tmpz]) \n\t"
"add.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re + tmpz[5].re;
"add.s %[tmp3], %[tmp3], %[pom1] \n\t" // tmp3 = tmpz[6].re + tmpz[7].re;
"add.s %[tmp2], %[tmp2], %[pom2] \n\t" // tmp2 = tmpz[4].im + tmpz[5].im;
"lwc1 %[pom], 40(%[tmpz]) \n\t"
"add.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im + tmpz[7].im;
"add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
"sub.s %[tmp7], %[tmp1], %[tmp3] \n\t" // tmp7 = tmp1 - tmp3;
"lwc1 %[tmp1], 32(%[tmpz]) \n\t"
"lwc1 %[pom1], 44(%[tmpz]) \n\t"
"add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
"sub.s %[tmp8], %[tmp2], %[tmp4] \n\t" // tmp8 = tmp2 - tmp4;
"lwc1 %[tmp2], 36(%[tmpz]) \n\t"
"lwc1 %[pom2], 56(%[tmpz]) \n\t"
"lwc1 %[pom3], 60(%[tmpz]) \n\t"
"lwc1 %[tmp3], 48(%[tmpz]) \n\t"
"lwc1 %[tmp4], 52(%[tmpz]) \n\t"
"sub.s %[tmp1], %[tmp1], %[pom] \n\t" // tmp1 = tmpz[4].re - tmpz[5].re;
"lwc1 %[pom], 0(%[tmpz]) \n\t"
"sub.s %[tmp2], %[tmp2], %[pom1] \n\t" // tmp2 = tmpz[4].im - tmpz[5].im;
"sub.s %[tmp3], %[tmp3], %[pom2] \n\t" // tmp3 = tmpz[6].re - tmpz[7].re;
"lwc1 %[pom2], 4(%[tmpz]) \n\t"
"sub.s %[pom1], %[pom], %[tmp5] \n\t"
"sub.s %[tmp4], %[tmp4], %[pom3] \n\t" // tmp4 = tmpz[6].im - tmpz[7].im;
"add.s %[pom3], %[pom], %[tmp5] \n\t"
"sub.s %[pom], %[pom2], %[tmp6] \n\t"
"add.s %[pom2], %[pom2], %[tmp6] \n\t"
"swc1 %[pom1], 32(%[tmpz]) \n\t" // tmpz[4].re = tmpz[0].re - tmp5;
"swc1 %[pom3], 0(%[tmpz]) \n\t" // tmpz[0].re = tmpz[0].re + tmp5;
"swc1 %[pom], 36(%[tmpz]) \n\t" // tmpz[4].im = tmpz[0].im - tmp6;
"swc1 %[pom2], 4(%[tmpz]) \n\t" // tmpz[0].im = tmpz[0].im + tmp6;
"lwc1 %[pom1], 16(%[tmpz]) \n\t"
"lwc1 %[pom3], 20(%[tmpz]) \n\t"
"li.s %[pom], 0.7071067812 \n\t" // float pom = 0.7071067812f;
"add.s %[temp1],%[tmp1], %[tmp2] \n\t"
"sub.s %[temp], %[pom1], %[tmp8] \n\t"
"add.s %[pom2], %[pom3], %[tmp7] \n\t"
"sub.s %[temp3],%[tmp3], %[tmp4] \n\t"
"sub.s %[temp4],%[tmp2], %[tmp1] \n\t"
"swc1 %[temp], 48(%[tmpz]) \n\t" // tmpz[6].re = tmpz[2].re - tmp8;
"swc1 %[pom2], 52(%[tmpz]) \n\t" // tmpz[6].im = tmpz[2].im + tmp7;
"add.s %[pom1], %[pom1], %[tmp8] \n\t"
"sub.s %[pom3], %[pom3], %[tmp7] \n\t"
"add.s %[tmp3], %[tmp3], %[tmp4] \n\t"
"mul.s %[tmp5], %[pom], %[temp1] \n\t" // tmp5 = pom * (tmp1 + tmp2);
"mul.s %[tmp7], %[pom], %[temp3] \n\t" // tmp7 = pom * (tmp3 - tmp4);
"mul.s %[tmp6], %[pom], %[temp4] \n\t" // tmp6 = pom * (tmp2 - tmp1);
"mul.s %[tmp8], %[pom], %[tmp3] \n\t" // tmp8 = pom * (tmp3 + tmp4);
"swc1 %[pom1], 16(%[tmpz]) \n\t" // tmpz[2].re = tmpz[2].re + tmp8;
"swc1 %[pom3], 20(%[tmpz]) \n\t" // tmpz[2].im = tmpz[2].im - tmp7;
"add.s %[tmp1], %[tmp5], %[tmp7] \n\t" // tmp1 = tmp5 + tmp7;
"sub.s %[tmp3], %[tmp5], %[tmp7] \n\t" // tmp3 = tmp5 - tmp7;
"add.s %[tmp2], %[tmp6], %[tmp8] \n\t" // tmp2 = tmp6 + tmp8;
"sub.s %[tmp4], %[tmp6], %[tmp8] \n\t" // tmp4 = tmp6 - tmp8;
"lwc1 %[temp], 8(%[tmpz]) \n\t"
"lwc1 %[temp1],12(%[tmpz]) \n\t"
"lwc1 %[pom], 24(%[tmpz]) \n\t"
"lwc1 %[pom2], 28(%[tmpz]) \n\t"
"sub.s %[temp4],%[temp], %[tmp1] \n\t"
"sub.s %[temp3],%[temp1], %[tmp2] \n\t"
"add.s %[temp], %[temp], %[tmp1] \n\t"
"add.s %[temp1],%[temp1], %[tmp2] \n\t"
"sub.s %[pom1], %[pom], %[tmp4] \n\t"
"add.s %[pom3], %[pom2], %[tmp3] \n\t"
"add.s %[pom], %[pom], %[tmp4] \n\t"
"sub.s %[pom2], %[pom2], %[tmp3] \n\t"
"swc1 %[temp4],40(%[tmpz]) \n\t" // tmpz[5].re = tmpz[1].re - tmp1;
"swc1 %[temp3],44(%[tmpz]) \n\t" // tmpz[5].im = tmpz[1].im - tmp2;
"swc1 %[temp], 8(%[tmpz]) \n\t" // tmpz[1].re = tmpz[1].re + tmp1;
"swc1 %[temp1],12(%[tmpz]) \n\t" // tmpz[1].im = tmpz[1].im + tmp2;
"swc1 %[pom1], 56(%[tmpz]) \n\t" // tmpz[7].re = tmpz[3].re - tmp4;
"swc1 %[pom3], 60(%[tmpz]) \n\t" // tmpz[7].im = tmpz[3].im + tmp3;
"swc1 %[pom], 24(%[tmpz]) \n\t" // tmpz[3].re = tmpz[3].re + tmp4;
"swc1 %[pom2], 28(%[tmpz]) \n\t" // tmpz[3].im = tmpz[3].im - tmp3;
: [tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
[tmp3]"=&f"(tmp3), [tmp2]"=&f"(tmp2), [tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp7]"=&f"(tmp7),
[tmp6]"=&f"(tmp6), [tmp8]"=&f"(tmp8), [pom3]"=&f"(pom3),[temp]"=&f"(temp), [temp1]"=&f"(temp1),
[temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
: [tmpz]"r"(tmpz)
: "memory"
);
}
step = 1 << (MAX_LOG2_NFFT - 4);
n4 = 4;
for (nbits=4; nbits<=s->nbits; nbits++) {
/*
* num_transforms = (num_transforms >> 1) | 1;
*/
__asm__ volatile (
"sra %[num_t], %[num_t], 1 \n\t"
"ori %[num_t], %[num_t], 1 \n\t"
: [num_t] "+r" (num_transforms)
);
n2 = 2 * n4;
n34 = 3 * n4;
for (n=0; n<num_transforms; n++) {
offset = fft_offsets_lut[n] << nbits;
tmpz = z + offset;
tmpz_n2 = tmpz + n2;
tmpz_n4 = tmpz + n4;
tmpz_n34 = tmpz + n34;
__asm__ volatile (
"lwc1 %[pom1], 0(%[tmpz_n2]) \n\t"
"lwc1 %[pom], 0(%[tmpz_n34]) \n\t"
"lwc1 %[pom2], 4(%[tmpz_n2]) \n\t"
"lwc1 %[pom3], 4(%[tmpz_n34]) \n\t"
"lwc1 %[temp1],0(%[tmpz]) \n\t"
"lwc1 %[temp3],4(%[tmpz]) \n\t"
"add.s %[tmp5], %[pom1], %[pom] \n\t" // tmp5 = tmpz[ n2].re + tmpz[n34].re;
"sub.s %[tmp1], %[pom1], %[pom] \n\t" // tmp1 = tmpz[ n2].re - tmpz[n34].re;
"add.s %[tmp6], %[pom2], %[pom3] \n\t" // tmp6 = tmpz[ n2].im + tmpz[n34].im;
"sub.s %[tmp2], %[pom2], %[pom3] \n\t" // tmp2 = tmpz[ n2].im - tmpz[n34].im;
"sub.s %[temp], %[temp1], %[tmp5] \n\t"
"add.s %[temp1],%[temp1], %[tmp5] \n\t"
"sub.s %[temp4],%[temp3], %[tmp6] \n\t"
"add.s %[temp3],%[temp3], %[tmp6] \n\t"
"swc1 %[temp], 0(%[tmpz_n2]) \n\t" // tmpz[ n2].re = tmpz[ 0].re - tmp5;
"swc1 %[temp1],0(%[tmpz]) \n\t" // tmpz[ 0].re = tmpz[ 0].re + tmp5;
"lwc1 %[pom1], 0(%[tmpz_n4]) \n\t"
"swc1 %[temp4],4(%[tmpz_n2]) \n\t" // tmpz[ n2].im = tmpz[ 0].im - tmp6;
"lwc1 %[temp], 4(%[tmpz_n4]) \n\t"
"swc1 %[temp3],4(%[tmpz]) \n\t" // tmpz[ 0].im = tmpz[ 0].im + tmp6;
"sub.s %[pom], %[pom1], %[tmp2] \n\t"
"add.s %[pom1], %[pom1], %[tmp2] \n\t"
"add.s %[temp1],%[temp], %[tmp1] \n\t"
"sub.s %[temp], %[temp], %[tmp1] \n\t"
"swc1 %[pom], 0(%[tmpz_n34]) \n\t" // tmpz[n34].re = tmpz[n4].re - tmp2;
"swc1 %[pom1], 0(%[tmpz_n4]) \n\t" // tmpz[ n4].re = tmpz[n4].re + tmp2;
"swc1 %[temp1],4(%[tmpz_n34]) \n\t" // tmpz[n34].im = tmpz[n4].im + tmp1;
"swc1 %[temp], 4(%[tmpz_n4]) \n\t" // tmpz[ n4].im = tmpz[n4].im - tmp1;
: [tmp5]"=&f"(tmp5),
[tmp1]"=&f"(tmp1), [pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2),
[tmp2]"=&f"(tmp2), [tmp6]"=&f"(tmp6), [pom3]"=&f"(pom3),
[temp]"=&f"(temp), [temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4)
: [tmpz]"r"(tmpz), [tmpz_n2]"r"(tmpz_n2), [tmpz_n34]"r"(tmpz_n34), [tmpz_n4]"r"(tmpz_n4)
: "memory"
);
w_re_ptr = (float*)(ff_cos_65536 + step);
w_im_ptr = (float*)(ff_cos_65536 + MAX_FFT_SIZE/4 - step);
for (i=1; i<n4; i++) {
w_re = w_re_ptr[0];
w_im = w_im_ptr[0];
tmpz_n2_i = tmpz_n2 + i;
tmpz_n4_i = tmpz_n4 + i;
tmpz_n34_i= tmpz_n34 + i;
tmpz_i = tmpz + i;
__asm__ volatile (
"lwc1 %[temp], 0(%[tmpz_n2_i]) \n\t"
"lwc1 %[temp1], 4(%[tmpz_n2_i]) \n\t"
"lwc1 %[pom], 0(%[tmpz_n34_i]) \n\t"
"lwc1 %[pom1], 4(%[tmpz_n34_i]) \n\t"
"mul.s %[temp3], %[w_im], %[temp] \n\t"
"mul.s %[temp4], %[w_im], %[temp1] \n\t"
"mul.s %[pom2], %[w_im], %[pom1] \n\t"
"mul.s %[pom3], %[w_im], %[pom] \n\t"
"msub.s %[tmp2], %[temp3], %[w_re], %[temp1] \n\t" // tmp2 = w_re * tmpz[ n2+i].im - w_im * tmpz[ n2+i].re;
"madd.s %[tmp1], %[temp4], %[w_re], %[temp] \n\t" // tmp1 = w_re * tmpz[ n2+i].re + w_im * tmpz[ n2+i].im;
"msub.s %[tmp3], %[pom2], %[w_re], %[pom] \n\t" // tmp3 = w_re * tmpz[n34+i].re - w_im * tmpz[n34+i].im;
"madd.s %[tmp4], %[pom3], %[w_re], %[pom1] \n\t" // tmp4 = w_re * tmpz[n34+i].im + w_im * tmpz[n34+i].re;
"lwc1 %[temp], 0(%[tmpz_i]) \n\t"
"lwc1 %[pom], 4(%[tmpz_i]) \n\t"
"add.s %[tmp5], %[tmp1], %[tmp3] \n\t" // tmp5 = tmp1 + tmp3;
"sub.s %[tmp1], %[tmp1], %[tmp3] \n\t" // tmp1 = tmp1 - tmp3;
"add.s %[tmp6], %[tmp2], %[tmp4] \n\t" // tmp6 = tmp2 + tmp4;
"sub.s %[tmp2], %[tmp2], %[tmp4] \n\t" // tmp2 = tmp2 - tmp4;
"sub.s %[temp1], %[temp], %[tmp5] \n\t"
"add.s %[temp], %[temp], %[tmp5] \n\t"
"sub.s %[pom1], %[pom], %[tmp6] \n\t"
"add.s %[pom], %[pom], %[tmp6] \n\t"
"lwc1 %[temp3], 0(%[tmpz_n4_i]) \n\t"
"lwc1 %[pom2], 4(%[tmpz_n4_i]) \n\t"
"swc1 %[temp1], 0(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].re = tmpz[ i].re - tmp5;
"swc1 %[temp], 0(%[tmpz_i]) \n\t" // tmpz[ i].re = tmpz[ i].re + tmp5;
"swc1 %[pom1], 4(%[tmpz_n2_i]) \n\t" // tmpz[ n2+i].im = tmpz[ i].im - tmp6;
"swc1 %[pom] , 4(%[tmpz_i]) \n\t" // tmpz[ i].im = tmpz[ i].im + tmp6;
"sub.s %[temp4], %[temp3], %[tmp2] \n\t"
"add.s %[pom3], %[pom2], %[tmp1] \n\t"
"add.s %[temp3], %[temp3], %[tmp2] \n\t"
"sub.s %[pom2], %[pom2], %[tmp1] \n\t"
"swc1 %[temp4], 0(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].re = tmpz[n4+i].re - tmp2;
"swc1 %[pom3], 4(%[tmpz_n34_i]) \n\t" // tmpz[n34+i].im = tmpz[n4+i].im + tmp1;
"swc1 %[temp3], 0(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].re = tmpz[n4+i].re + tmp2;
"swc1 %[pom2], 4(%[tmpz_n4_i]) \n\t" // tmpz[ n4+i].im = tmpz[n4+i].im - tmp1;
: [tmp1]"=&f"(tmp1), [tmp2]"=&f" (tmp2), [temp]"=&f"(temp), [tmp3]"=&f"(tmp3),
[tmp4]"=&f"(tmp4), [tmp5]"=&f"(tmp5), [tmp6]"=&f"(tmp6),
[temp1]"=&f"(temp1), [temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
[pom]"=&f"(pom), [pom1]"=&f"(pom1), [pom2]"=&f"(pom2), [pom3]"=&f"(pom3)
: [w_re]"f"(w_re), [w_im]"f"(w_im),
[tmpz_i]"r"(tmpz_i),[tmpz_n2_i]"r"(tmpz_n2_i),
[tmpz_n34_i]"r"(tmpz_n34_i), [tmpz_n4_i]"r"(tmpz_n4_i)
: "memory"
);
w_re_ptr += step;
w_im_ptr -= step;
}
}
step >>= 1;
n4 <<= 1;
}
}
/**
* MDCT/IMDCT transforms.
*/
static void ff_imdct_half_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
{
int k, n8, n4, n2, n, j;
const uint16_t *revtab = s->revtab;
const FFTSample *tcos = s->tcos;
const FFTSample *tsin = s->tsin;
const FFTSample *in1, *in2, *in3, *in4;
FFTComplex *z = (FFTComplex *)output;
int j1;
const float *tcos1, *tsin1, *tcos2, *tsin2;
float temp1, temp2, temp3, temp4, temp5, temp6, temp7, temp8,
temp9, temp10, temp11, temp12, temp13, temp14, temp15, temp16;
FFTComplex *z1, *z2;
n = 1 << s->mdct_bits;
n2 = n >> 1;
n4 = n >> 2;
n8 = n >> 3;
/* pre rotation */
in1 = input;
in2 = input + n2 - 1;
in3 = input + 2;
in4 = input + n2 - 3;
tcos1 = tcos;
tsin1 = tsin;
/* n4 = 64 or 128 */
for(k = 0; k < n4; k += 2) {
j = revtab[k ];
j1 = revtab[k + 1];
__asm__ volatile (
"lwc1 %[temp1], 0(%[in2]) \t\n"
"lwc1 %[temp2], 0(%[tcos1]) \t\n"
"lwc1 %[temp3], 0(%[tsin1]) \t\n"
"lwc1 %[temp4], 0(%[in1]) \t\n"
"lwc1 %[temp5], 0(%[in4]) \t\n"
"mul.s %[temp9], %[temp1], %[temp2] \t\n"
"mul.s %[temp10], %[temp1], %[temp3] \t\n"
"lwc1 %[temp6], 4(%[tcos1]) \t\n"
"lwc1 %[temp7], 4(%[tsin1]) \t\n"
"nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
"madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
"mul.s %[temp11], %[temp5], %[temp6] \t\n"
"mul.s %[temp12], %[temp5], %[temp7] \t\n"
"lwc1 %[temp8], 0(%[in3]) \t\n"
"addiu %[tcos1], %[tcos1], 8 \t\n"
"addiu %[tsin1], %[tsin1], 8 \t\n"
"addiu %[in1], %[in1], 16 \t\n"
"nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
"madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
"addiu %[in2], %[in2], -16 \t\n"
"addiu %[in3], %[in3], 16 \t\n"
"addiu %[in4], %[in4], -16 \t\n"
: [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
[temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
[temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
[temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
[temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
[temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
[tsin1]"+r"(tsin1), [tcos1]"+r"(tcos1),
[in1]"+r"(in1), [in2]"+r"(in2),
[in3]"+r"(in3), [in4]"+r"(in4)
:
: "memory"
);
z[j ].re = temp9;
z[j ].im = temp10;
z[j1].re = temp11;
z[j1].im = temp12;
}
s->fft_calc(s, z);
/* post rotation + reordering */
/* n8 = 32 or 64 */
for(k = 0; k < n8; k += 2) {
tcos1 = &tcos[n8 - k - 2];
tsin1 = &tsin[n8 - k - 2];
tcos2 = &tcos[n8 + k];
tsin2 = &tsin[n8 + k];
z1 = &z[n8 - k - 2];
z2 = &z[n8 + k ];
__asm__ volatile (
"lwc1 %[temp1], 12(%[z1]) \t\n"
"lwc1 %[temp2], 4(%[tsin1]) \t\n"
"lwc1 %[temp3], 4(%[tcos1]) \t\n"
"lwc1 %[temp4], 8(%[z1]) \t\n"
"lwc1 %[temp5], 4(%[z1]) \t\n"
"mul.s %[temp9], %[temp1], %[temp2] \t\n"
"mul.s %[temp10], %[temp1], %[temp3] \t\n"
"lwc1 %[temp6], 0(%[tsin1]) \t\n"
"lwc1 %[temp7], 0(%[tcos1]) \t\n"
"nmsub.s %[temp9], %[temp9], %[temp4], %[temp3] \t\n"
"madd.s %[temp10], %[temp10], %[temp4], %[temp2] \t\n"
"mul.s %[temp11], %[temp5], %[temp6] \t\n"
"mul.s %[temp12], %[temp5], %[temp7] \t\n"
"lwc1 %[temp8], 0(%[z1]) \t\n"
"lwc1 %[temp1], 4(%[z2]) \t\n"
"lwc1 %[temp2], 0(%[tsin2]) \t\n"
"lwc1 %[temp3], 0(%[tcos2]) \t\n"
"nmsub.s %[temp11], %[temp11], %[temp8], %[temp7] \t\n"
"madd.s %[temp12], %[temp12], %[temp8], %[temp6] \t\n"
"mul.s %[temp13], %[temp1], %[temp2] \t\n"
"mul.s %[temp14], %[temp1], %[temp3] \t\n"
"lwc1 %[temp4], 0(%[z2]) \t\n"
"lwc1 %[temp5], 12(%[z2]) \t\n"
"lwc1 %[temp6], 4(%[tsin2]) \t\n"
"lwc1 %[temp7], 4(%[tcos2]) \t\n"
"nmsub.s %[temp13], %[temp13], %[temp4], %[temp3] \t\n"
"madd.s %[temp14], %[temp14], %[temp4], %[temp2] \t\n"
"mul.s %[temp15], %[temp5], %[temp6] \t\n"
"mul.s %[temp16], %[temp5], %[temp7] \t\n"
"lwc1 %[temp8], 8(%[z2]) \t\n"
"nmsub.s %[temp15], %[temp15], %[temp8], %[temp7] \t\n"
"madd.s %[temp16], %[temp16], %[temp8], %[temp6] \t\n"
: [temp1]"=&f"(temp1), [temp2]"=&f"(temp2),
[temp3]"=&f"(temp3), [temp4]"=&f"(temp4),
[temp5]"=&f"(temp5), [temp6]"=&f"(temp6),
[temp7]"=&f"(temp7), [temp8]"=&f"(temp8),
[temp9]"=&f"(temp9), [temp10]"=&f"(temp10),
[temp11]"=&f"(temp11), [temp12]"=&f"(temp12),
[temp13]"=&f"(temp13), [temp14]"=&f"(temp14),
[temp15]"=&f"(temp15), [temp16]"=&f"(temp16)
: [z1]"r"(z1), [z2]"r"(z2),
[tsin1]"r"(tsin1), [tcos1]"r"(tcos1),
[tsin2]"r"(tsin2), [tcos2]"r"(tcos2)
: "memory"
);
z1[1].re = temp9;
z1[1].im = temp14;
z2[0].re = temp13;
z2[0].im = temp10;
z1[0].re = temp11;
z1[0].im = temp16;
z2[1].re = temp15;
z2[1].im = temp12;
}
}
/**
* Compute inverse MDCT of size N = 2^nbits
* @param output N samples
* @param input N/2 samples
*/
static void ff_imdct_calc_mips(FFTContext *s, FFTSample *output, const FFTSample *input)
{
int k;
int n = 1 << s->mdct_bits;
int n2 = n >> 1;
int n4 = n >> 2;
ff_imdct_half_mips(s, output+n4, input);
for(k = 0; k < n4; k+=4) {
output[k] = -output[n2-k-1];
output[k+1] = -output[n2-k-2];
output[k+2] = -output[n2-k-3];
output[k+3] = -output[n2-k-4];
output[n-k-1] = output[n2+k];
output[n-k-2] = output[n2+k+1];
output[n-k-3] = output[n2+k+2];
output[n-k-4] = output[n2+k+3];
}
}
#endif /* HAVE_INLINE_ASM */
av_cold void ff_fft_init_mips(FFTContext *s)
{
int n=0;
ff_fft_lut_init(fft_offsets_lut, 0, 1 << 16, &n);
ff_init_ff_cos_tabs(16);
#if HAVE_INLINE_ASM
s->fft_calc = ff_fft_calc_mips;
#if CONFIG_MDCT
s->imdct_calc = ff_imdct_calc_mips;
s->imdct_half = ff_imdct_half_mips;
#endif
#endif
}
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