1/* 2 * FFT/MDCT transform with SSE optimizations 3 * Copyright (c) 2008 Loren Merritt 4 * 5 * This file is part of FFmpeg. 6 * 7 * FFmpeg is free software; you can redistribute it and/or 8 * modify it under the terms of the GNU Lesser General Public 9 * License as published by the Free Software Foundation; either 10 * version 2.1 of the License, or (at your option) any later version. 11 * 12 * FFmpeg is distributed in the hope that it will be useful, 13 * but WITHOUT ANY WARRANTY; without even the implied warranty of 14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 15 * Lesser General Public License for more details. 16 * 17 * You should have received a copy of the GNU Lesser General Public 18 * License along with FFmpeg; if not, write to the Free Software 19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 20 */ 21 22#include "libavutil/x86_cpu.h" 23#include "libavcodec/dsputil.h" 24 25static const int m1m1m1m1[4] __attribute__((aligned(16))) = 26 { 1 << 31, 1 << 31, 1 << 31, 1 << 31 }; 27 28void ff_fft_dispatch_sse(FFTComplex *z, int nbits); 29void ff_fft_dispatch_interleave_sse(FFTComplex *z, int nbits); 30 31void ff_fft_calc_sse(FFTContext *s, FFTComplex *z) 32{ 33 int n = 1 << s->nbits; 34 35 ff_fft_dispatch_interleave_sse(z, s->nbits); 36 37 if(n <= 16) { 38 x86_reg i = -8*n; 39 __asm__ volatile( 40 "1: \n" 41 "movaps (%0,%1), %%xmm0 \n" 42 "movaps %%xmm0, %%xmm1 \n" 43 "unpcklps 16(%0,%1), %%xmm0 \n" 44 "unpckhps 16(%0,%1), %%xmm1 \n" 45 "movaps %%xmm0, (%0,%1) \n" 46 "movaps %%xmm1, 16(%0,%1) \n" 47 "add $32, %0 \n" 48 "jl 1b \n" 49 :"+r"(i) 50 :"r"(z+n) 51 :"memory" 52 ); 53 } 54} 55 56void ff_fft_permute_sse(FFTContext *s, FFTComplex *z) 57{ 58 int n = 1 << s->nbits; 59 int i; 60 for(i=0; i<n; i+=2) { 61 __asm__ volatile( 62 "movaps %2, %%xmm0 \n" 63 "movlps %%xmm0, %0 \n" 64 "movhps %%xmm0, %1 \n" 65 :"=m"(s->tmp_buf[s->revtab[i]]), 66 "=m"(s->tmp_buf[s->revtab[i+1]]) 67 :"m"(z[i]) 68 ); 69 } 70 memcpy(z, s->tmp_buf, n*sizeof(FFTComplex)); 71} 72 73void ff_imdct_half_sse(MDCTContext *s, FFTSample *output, const FFTSample *input) 74{ 75 av_unused x86_reg i, j, k, l; 76 long n = 1 << s->nbits; 77 long n2 = n >> 1; 78 long n4 = n >> 2; 79 long n8 = n >> 3; 80 const uint16_t *revtab = s->fft.revtab + n8; 81 const FFTSample *tcos = s->tcos; 82 const FFTSample *tsin = s->tsin; 83 FFTComplex *z = (FFTComplex *)output; 84 85 /* pre rotation */ 86 for(k=n8-2; k>=0; k-=2) { 87 __asm__ volatile( 88 "movaps (%2,%1,2), %%xmm0 \n" // { z[k].re, z[k].im, z[k+1].re, z[k+1].im } 89 "movaps -16(%2,%0,2), %%xmm1 \n" // { z[-k-2].re, z[-k-2].im, z[-k-1].re, z[-k-1].im } 90 "movaps %%xmm0, %%xmm2 \n" 91 "shufps $0x88, %%xmm1, %%xmm0 \n" // { z[k].re, z[k+1].re, z[-k-2].re, z[-k-1].re } 92 "shufps $0x77, %%xmm2, %%xmm1 \n" // { z[-k-1].im, z[-k-2].im, z[k+1].im, z[k].im } 93 "movlps (%3,%1), %%xmm4 \n" 94 "movlps (%4,%1), %%xmm5 \n" 95 "movhps -8(%3,%0), %%xmm4 \n" // { cos[k], cos[k+1], cos[-k-2], cos[-k-1] } 96 "movhps -8(%4,%0), %%xmm5 \n" // { sin[k], sin[k+1], sin[-k-2], sin[-k-1] } 97 "movaps %%xmm0, %%xmm2 \n" 98 "movaps %%xmm1, %%xmm3 \n" 99 "mulps %%xmm5, %%xmm0 \n" // re*sin 100 "mulps %%xmm4, %%xmm1 \n" // im*cos 101 "mulps %%xmm4, %%xmm2 \n" // re*cos 102 "mulps %%xmm5, %%xmm3 \n" // im*sin 103 "subps %%xmm0, %%xmm1 \n" // -> re 104 "addps %%xmm3, %%xmm2 \n" // -> im 105 "movaps %%xmm1, %%xmm0 \n" 106 "unpcklps %%xmm2, %%xmm1 \n" // { z[k], z[k+1] } 107 "unpckhps %%xmm2, %%xmm0 \n" // { z[-k-2], z[-k-1] } 108 ::"r"(-4*k), "r"(4*k), 109 "r"(input+n4), "r"(tcos+n8), "r"(tsin+n8) 110 ); 111#if ARCH_X86_64 112 // if we have enough regs, don't let gcc make the luts latency-bound 113 // but if not, latency is faster than spilling 114 __asm__("movlps %%xmm0, %0 \n" 115 "movhps %%xmm0, %1 \n" 116 "movlps %%xmm1, %2 \n" 117 "movhps %%xmm1, %3 \n" 118 :"=m"(z[revtab[-k-2]]), 119 "=m"(z[revtab[-k-1]]), 120 "=m"(z[revtab[ k ]]), 121 "=m"(z[revtab[ k+1]]) 122 ); 123#else 124 __asm__("movlps %%xmm0, %0" :"=m"(z[revtab[-k-2]])); 125 __asm__("movhps %%xmm0, %0" :"=m"(z[revtab[-k-1]])); 126 __asm__("movlps %%xmm1, %0" :"=m"(z[revtab[ k ]])); 127 __asm__("movhps %%xmm1, %0" :"=m"(z[revtab[ k+1]])); 128#endif 129 } 130 131 ff_fft_dispatch_sse(z, s->fft.nbits); 132 133 /* post rotation + reinterleave + reorder */ 134 135#define CMUL(j,xmm0,xmm1)\ 136 "movaps (%2,"#j",2), %%xmm6 \n"\ 137 "movaps 16(%2,"#j",2), "#xmm0"\n"\ 138 "movaps %%xmm6, "#xmm1"\n"\ 139 "movaps "#xmm0",%%xmm7 \n"\ 140 "mulps (%3,"#j"), %%xmm6 \n"\ 141 "mulps (%4,"#j"), "#xmm0"\n"\ 142 "mulps (%4,"#j"), "#xmm1"\n"\ 143 "mulps (%3,"#j"), %%xmm7 \n"\ 144 "subps %%xmm6, "#xmm0"\n"\ 145 "addps %%xmm7, "#xmm1"\n" 146 147 j = -n2; 148 k = n2-16; 149 __asm__ volatile( 150 "1: \n" 151 CMUL(%0, %%xmm0, %%xmm1) 152 CMUL(%1, %%xmm4, %%xmm5) 153 "shufps $0x1b, %%xmm1, %%xmm1 \n" 154 "shufps $0x1b, %%xmm5, %%xmm5 \n" 155 "movaps %%xmm4, %%xmm6 \n" 156 "unpckhps %%xmm1, %%xmm4 \n" 157 "unpcklps %%xmm1, %%xmm6 \n" 158 "movaps %%xmm0, %%xmm2 \n" 159 "unpcklps %%xmm5, %%xmm0 \n" 160 "unpckhps %%xmm5, %%xmm2 \n" 161 "movaps %%xmm6, (%2,%1,2) \n" 162 "movaps %%xmm4, 16(%2,%1,2) \n" 163 "movaps %%xmm0, (%2,%0,2) \n" 164 "movaps %%xmm2, 16(%2,%0,2) \n" 165 "sub $16, %1 \n" 166 "add $16, %0 \n" 167 "jl 1b \n" 168 :"+&r"(j), "+&r"(k) 169 :"r"(z+n8), "r"(tcos+n8), "r"(tsin+n8) 170 :"memory" 171 ); 172} 173 174void ff_imdct_calc_sse(MDCTContext *s, FFTSample *output, const FFTSample *input) 175{ 176 x86_reg j, k; 177 long n = 1 << s->nbits; 178 long n4 = n >> 2; 179 180 ff_imdct_half_sse(s, output+n4, input); 181 182 j = -n; 183 k = n-16; 184 __asm__ volatile( 185 "movaps %4, %%xmm7 \n" 186 "1: \n" 187 "movaps (%2,%1), %%xmm0 \n" 188 "movaps (%3,%0), %%xmm1 \n" 189 "shufps $0x1b, %%xmm0, %%xmm0 \n" 190 "shufps $0x1b, %%xmm1, %%xmm1 \n" 191 "xorps %%xmm7, %%xmm0 \n" 192 "movaps %%xmm1, (%3,%1) \n" 193 "movaps %%xmm0, (%2,%0) \n" 194 "sub $16, %1 \n" 195 "add $16, %0 \n" 196 "jl 1b \n" 197 :"+r"(j), "+r"(k) 198 :"r"(output+n4), "r"(output+n4*3), 199 "m"(*m1m1m1m1) 200 ); 201} 202 203