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Patch by Zuxy Meng < zuxy POIS meng AH gmail POIS com > OKed by Michael Original thread: Date: Mar 5, 2006 8:15 PM Subject: [Ffmpeg-devel] [PATCH] Little optimization to fft_sse.c Originally committed as revision 5112 to svn://svn.ffmpeg.org/ffmpeg/trunk
141 lines
3.8 KiB
C
141 lines
3.8 KiB
C
/*
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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "../dsputil.h"
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#include <math.h>
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#ifdef HAVE_BUILTIN_VECTOR
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#include <xmmintrin.h>
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static const int p1p1p1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 0, 1 << 31 };
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static const int p1p1m1p1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 0 };
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static const int p1p1m1m1[4] __attribute__((aligned(16))) =
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{ 0, 0, 1 << 31, 1 << 31 };
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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 ff_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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if (s->inverse)
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c2 = *(__m128 *)p1p1m1p1;
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else
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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_xor_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_xor_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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/* by toggling the sign bit */
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b = _mm_shuffle_ps(b, b, _MM_SHUFFLE(2, 3, 1, 0));
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b = _mm_xor_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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#endif
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