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168 lines
5.8 KiB
168 lines
5.8 KiB
/*Copyright (c) 2013, Xiph.Org Foundation and contributors.
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All rights reserved.
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Redistribution and use in source and binary forms, with or without
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modification, are permitted provided that the following conditions are met:
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* Redistributions of source code must retain the above copyright notice,
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this list of conditions and the following disclaimer.
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* Redistributions in binary form must reproduce the above copyright notice,
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this list of conditions and the following disclaimer in the
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documentation and/or other materials provided with the distribution.
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THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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POSSIBILITY OF SUCH DAMAGE.*/
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#ifndef KISS_FFT_MIPSR1_H
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#define KISS_FFT_MIPSR1_H
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#if !defined(KISS_FFT_GUTS_H)
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#error "This file should only be included from _kiss_fft_guts.h"
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#endif
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#ifdef FIXED_POINT
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#define S_MUL_ADD(a, b, c, d) (S_MUL(a,b)+S_MUL(c,d))
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#define S_MUL_SUB(a, b, c, d) (S_MUL(a,b)-S_MUL(c,d))
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#undef S_MUL_ADD
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static inline int S_MUL_ADD(int a, int b, int c, int d) {
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int m;
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a), "r" ((int)b));
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asm volatile("madd $ac1, %0, %1" : : "r" ((int)c), "r" ((int)d));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m): "i" (15));
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return m;
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}
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#undef S_MUL_SUB
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static inline int S_MUL_SUB(int a, int b, int c, int d) {
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int m;
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a), "r" ((int)b));
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asm volatile("msub $ac1, %0, %1" : : "r" ((int)c), "r" ((int)d));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m): "i" (15));
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return m;
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}
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#undef C_MUL
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# define C_MUL(m,a,b) (m=C_MUL_fun(a,b))
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static inline kiss_fft_cpx C_MUL_fun(kiss_fft_cpx a, kiss_twiddle_cpx b) {
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kiss_fft_cpx m;
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a.r), "r" ((int)b.r));
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asm volatile("msub $ac1, %0, %1" : : "r" ((int)a.i), "r" ((int)b.i));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m.r): "i" (15));
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a.r), "r" ((int)b.i));
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asm volatile("madd $ac1, %0, %1" : : "r" ((int)a.i), "r" ((int)b.r));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m.i): "i" (15));
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return m;
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}
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#undef C_MULC
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# define C_MULC(m,a,b) (m=C_MULC_fun(a,b))
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static inline kiss_fft_cpx C_MULC_fun(kiss_fft_cpx a, kiss_twiddle_cpx b) {
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kiss_fft_cpx m;
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a.r), "r" ((int)b.r));
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asm volatile("madd $ac1, %0, %1" : : "r" ((int)a.i), "r" ((int)b.i));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m.r): "i" (15));
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asm volatile("MULT $ac1, %0, %1" : : "r" ((int)a.i), "r" ((int)b.r));
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asm volatile("msub $ac1, %0, %1" : : "r" ((int)a.r), "r" ((int)b.i));
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asm volatile("EXTR.W %0,$ac1, %1" : "=r" (m.i): "i" (15));
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return m;
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}
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#endif /* FIXED_POINT */
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#define OVERRIDE_kf_bfly5
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static void kf_bfly5(
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kiss_fft_cpx * Fout,
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const size_t fstride,
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const kiss_fft_state *st,
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int m,
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int N,
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int mm
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)
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{
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kiss_fft_cpx *Fout0,*Fout1,*Fout2,*Fout3,*Fout4;
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int i, u;
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kiss_fft_cpx scratch[13];
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const kiss_twiddle_cpx *tw;
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kiss_twiddle_cpx ya,yb;
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kiss_fft_cpx * Fout_beg = Fout;
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#ifdef FIXED_POINT
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ya.r = 10126;
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ya.i = -31164;
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yb.r = -26510;
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yb.i = -19261;
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#else
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ya = st->twiddles[fstride*m];
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yb = st->twiddles[fstride*2*m];
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#endif
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tw=st->twiddles;
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for (i=0;i<N;i++)
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{
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Fout = Fout_beg + i*mm;
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Fout0=Fout;
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Fout1=Fout0+m;
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Fout2=Fout0+2*m;
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Fout3=Fout0+3*m;
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Fout4=Fout0+4*m;
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/* For non-custom modes, m is guaranteed to be a multiple of 4. */
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for ( u=0; u<m; ++u ) {
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scratch[0] = *Fout0;
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C_MUL(scratch[1] ,*Fout1, tw[u*fstride]);
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C_MUL(scratch[2] ,*Fout2, tw[2*u*fstride]);
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C_MUL(scratch[3] ,*Fout3, tw[3*u*fstride]);
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C_MUL(scratch[4] ,*Fout4, tw[4*u*fstride]);
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C_ADD( scratch[7],scratch[1],scratch[4]);
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C_SUB( scratch[10],scratch[1],scratch[4]);
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C_ADD( scratch[8],scratch[2],scratch[3]);
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C_SUB( scratch[9],scratch[2],scratch[3]);
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Fout0->r += scratch[7].r + scratch[8].r;
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Fout0->i += scratch[7].i + scratch[8].i;
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scratch[5].r = scratch[0].r + S_MUL_ADD(scratch[7].r,ya.r,scratch[8].r,yb.r);
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scratch[5].i = scratch[0].i + S_MUL_ADD(scratch[7].i,ya.r,scratch[8].i,yb.r);
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scratch[6].r = S_MUL_ADD(scratch[10].i,ya.i,scratch[9].i,yb.i);
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scratch[6].i = -S_MUL_ADD(scratch[10].r,ya.i,scratch[9].r,yb.i);
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C_SUB(*Fout1,scratch[5],scratch[6]);
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C_ADD(*Fout4,scratch[5],scratch[6]);
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scratch[11].r = scratch[0].r + S_MUL_ADD(scratch[7].r,yb.r,scratch[8].r,ya.r);
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scratch[11].i = scratch[0].i + S_MUL_ADD(scratch[7].i,yb.r,scratch[8].i,ya.r);
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scratch[12].r = S_MUL_SUB(scratch[9].i,ya.i,scratch[10].i,yb.i);
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scratch[12].i = S_MUL_SUB(scratch[10].r,yb.i,scratch[9].r,ya.i);
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C_ADD(*Fout2,scratch[11],scratch[12]);
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C_SUB(*Fout3,scratch[11],scratch[12]);
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++Fout0;++Fout1;++Fout2;++Fout3;++Fout4;
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}
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}
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}
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#endif /* KISS_FFT_MIPSR1_H */
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