diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/ppc/fft_altivec.c')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/ppc/fft_altivec.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/contrib/ffmpeg/libavcodec/ppc/fft_altivec.c b/contrib/ffmpeg/libavcodec/ppc/fft_altivec.c new file mode 100644 index 000000000..384a774ff --- /dev/null +++ b/contrib/ffmpeg/libavcodec/ppc/fft_altivec.c @@ -0,0 +1,166 @@ +/* + * FFT/IFFT transforms + * AltiVec-enabled + * Copyright (c) 2003 Romain Dolbeau <romain@dolbeau.org> + * Based on code Copyright (c) 2002 Fabrice Bellard. + * + * 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 "../dsputil.h" + +#include "gcc_fixes.h" + +#include "dsputil_altivec.h" + +/* + those three macros are from libavcodec/fft.c + and are required for the reference C code +*/ +/* butter fly op */ +#define BF(pre, pim, qre, qim, pre1, pim1, qre1, qim1) \ +{\ + FFTSample ax, ay, bx, by;\ + bx=pre1;\ + by=pim1;\ + ax=qre1;\ + ay=qim1;\ + pre = (bx + ax);\ + pim = (by + ay);\ + qre = (bx - ax);\ + qim = (by - ay);\ +} +#define MUL16(a,b) ((a) * (b)) +#define CMUL(pre, pim, are, aim, bre, bim) \ +{\ + pre = (MUL16(are, bre) - MUL16(aim, bim));\ + pim = (MUL16(are, bim) + MUL16(bre, aim));\ +} + + +/** + * Do a complex FFT with the parameters defined in ff_fft_init(). The + * input data must be permuted before with s->revtab table. No + * 1.0/sqrt(n) normalization is done. + * AltiVec-enabled + * This code assumes that the 'z' pointer is 16 bytes-aligned + * It also assumes all FFTComplex are 8 bytes-aligned pair of float + * The code is exactly the same as the SSE version, except + * that successive MUL + ADD/SUB have been merged into + * fused multiply-add ('vec_madd' in altivec) + */ +void ff_fft_calc_altivec(FFTContext *s, FFTComplex *z) +{ +POWERPC_PERF_DECLARE(altivec_fft_num, s->nbits >= 6); + register const vector float vczero = (const vector float)vec_splat_u32(0.); + + int ln = s->nbits; + int j, np, np2; + int nblocks, nloops; + register FFTComplex *p, *q; + FFTComplex *cptr, *cptr1; + int k; + +POWERPC_PERF_START_COUNT(altivec_fft_num, s->nbits >= 6); + + np = 1 << ln; + + { + vector float *r, a, b, a1, c1, c2; + + r = (vector float *)&z[0]; + + c1 = vcii(p,p,n,n); + + if (s->inverse) + { + c2 = vcii(p,p,n,p); + } + else + { + c2 = vcii(p,p,p,n); + } + + j = (np >> 2); + do { + a = vec_ld(0, r); + a1 = vec_ld(sizeof(vector float), r); + + b = vec_perm(a,a,vcprmle(1,0,3,2)); + a = vec_madd(a,c1,b); + /* do the pass 0 butterfly */ + + b = vec_perm(a1,a1,vcprmle(1,0,3,2)); + b = vec_madd(a1,c1,b); + /* do the pass 0 butterfly */ + + /* multiply third by -i */ + b = vec_perm(b,b,vcprmle(2,3,1,0)); + + /* do the pass 1 butterfly */ + vec_st(vec_madd(b,c2,a), 0, r); + vec_st(vec_nmsub(b,c2,a), sizeof(vector float), r); + + r += 2; + } while (--j != 0); + } + /* pass 2 .. ln-1 */ + + nblocks = np >> 3; + nloops = 1 << 2; + np2 = np >> 1; + + cptr1 = s->exptab1; + do { + p = z; + q = z + nloops; + j = nblocks; + do { + cptr = cptr1; + k = nloops >> 1; + do { + vector float a,b,c,t1; + + a = vec_ld(0, (float*)p); + b = vec_ld(0, (float*)q); + + /* complex mul */ + c = vec_ld(0, (float*)cptr); + /* cre*re cim*re */ + t1 = vec_madd(c, vec_perm(b,b,vcprmle(2,2,0,0)),vczero); + c = vec_ld(sizeof(vector float), (float*)cptr); + /* -cim*im cre*im */ + b = vec_madd(c, vec_perm(b,b,vcprmle(3,3,1,1)),t1); + + /* butterfly */ + vec_st(vec_add(a,b), 0, (float*)p); + vec_st(vec_sub(a,b), 0, (float*)q); + + p += 2; + q += 2; + cptr += 4; + } while (--k); + + p += nloops; + q += nloops; + } while (--j); + cptr1 += nloops * 2; + nblocks = nblocks >> 1; + nloops = nloops << 1; + } while (nblocks != 0); + +POWERPC_PERF_STOP_COUNT(altivec_fft_num, s->nbits >= 6); +} |