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128 lines
3.6 KiB
128 lines
3.6 KiB
/* |
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* FFT/MDCT transform with SSE optimizations |
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* Copyright (c) 2002 Fabrice Bellard. |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with this library; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "../dsputil.h" |
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#include <math.h> |
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#include <xmmintrin.h> |
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static const float p1p1p1m1[4] __attribute__((aligned(16))) = |
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{ 1.0, 1.0, 1.0, -1.0 }; |
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static const float p1p1m1m1[4] __attribute__((aligned(16))) = |
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{ 1.0, 1.0, -1.0, -1.0 }; |
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#if 0 |
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static void print_v4sf(const char *str, __m128 a) |
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{ |
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float *p = (float *)&a; |
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printf("%s: %f %f %f %f\n", |
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str, p[0], p[1], p[2], p[3]); |
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} |
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#endif |
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/* XXX: handle reverse case */ |
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void fft_calc_sse(FFTContext *s, FFTComplex *z) |
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{ |
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int ln = s->nbits; |
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int j, np, np2; |
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int nblocks, nloops; |
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register FFTComplex *p, *q; |
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FFTComplex *cptr, *cptr1; |
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int k; |
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np = 1 << ln; |
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{ |
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__m128 *r, a, b, a1, c1, c2; |
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r = (__m128 *)&z[0]; |
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c1 = *(__m128 *)p1p1m1m1; |
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c2 = *(__m128 *)p1p1p1m1; |
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j = (np >> 2); |
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do { |
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a = r[0]; |
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b = _mm_shuffle_ps(a, a, _MM_SHUFFLE(1, 0, 3, 2)); |
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a = _mm_mul_ps(a, c1); |
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/* do the pass 0 butterfly */ |
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a = _mm_add_ps(a, b); |
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a1 = r[1]; |
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b = _mm_shuffle_ps(a1, a1, _MM_SHUFFLE(1, 0, 3, 2)); |
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a1 = _mm_mul_ps(a1, c1); |
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/* do the pass 0 butterfly */ |
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b = _mm_add_ps(a1, b); |
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/* multiply third by -i */ |
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b = _mm_shuffle_ps(b, b, _MM_SHUFFLE(2, 3, 1, 0)); |
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b = _mm_mul_ps(b, c2); |
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/* do the pass 1 butterfly */ |
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r[0] = _mm_add_ps(a, b); |
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r[1] = _mm_sub_ps(a, b); |
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r += 2; |
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} while (--j != 0); |
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} |
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/* pass 2 .. ln-1 */ |
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nblocks = np >> 3; |
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nloops = 1 << 2; |
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np2 = np >> 1; |
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cptr1 = s->exptab1; |
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do { |
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p = z; |
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q = z + nloops; |
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j = nblocks; |
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do { |
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cptr = cptr1; |
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k = nloops >> 1; |
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do { |
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__m128 a, b, c, t1, t2; |
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a = *(__m128 *)p; |
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b = *(__m128 *)q; |
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/* complex mul */ |
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c = *(__m128 *)cptr; |
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/* cre*re cim*re */ |
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t1 = _mm_mul_ps(c, |
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_mm_shuffle_ps(b, b, _MM_SHUFFLE(2, 2, 0, 0))); |
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c = *(__m128 *)(cptr + 2); |
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/* -cim*im cre*im */ |
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t2 = _mm_mul_ps(c, |
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_mm_shuffle_ps(b, b, _MM_SHUFFLE(3, 3, 1, 1))); |
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b = _mm_add_ps(t1, t2); |
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/* butterfly */ |
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*(__m128 *)p = _mm_add_ps(a, b); |
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*(__m128 *)q = _mm_sub_ps(a, b); |
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p += 2; |
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q += 2; |
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cptr += 4; |
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} while (--k); |
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p += nloops; |
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q += nloops; |
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} while (--j); |
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cptr1 += nloops * 2; |
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nblocks = nblocks >> 1; |
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nloops = nloops << 1; |
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} while (nblocks != 0); |
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}
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