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ffmpeg / libavcodec / ppc / idct_altivec.c @ 2912e87a

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/*
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 * Copyright (c) 2001 Michel Lespinasse
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 *
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 * This file is part of Libav.
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 *
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 * Libav 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 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav 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 Libav; 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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/*
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 * NOTE: This code is based on GPL code from the libmpeg2 project.  The
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 * author, Michel Lespinasses, has given explicit permission to release
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 * under LGPL as part of Libav.
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 */
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/*
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 * Libav integration by Dieter Shirley
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 *
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 * This file is a direct copy of the AltiVec IDCT module from the libmpeg2
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 * project.  I've deleted all of the libmpeg2-specific code, renamed the
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 * functions and reordered the function parameters.  The only change to the
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 * IDCT function itself was to factor out the partial transposition, and to
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 * perform a full transpose at the end of the function.
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 */
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#include <stdlib.h>                                      /* malloc(), free() */
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#include <string.h>
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#include "config.h"
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#if HAVE_ALTIVEC_H
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#include <altivec.h>
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#endif
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#include "libavcodec/dsputil.h"
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#include "types_altivec.h"
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#include "dsputil_altivec.h"
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#define IDCT_HALF                                       \
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    /* 1st stage */                                     \
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    t1 = vec_mradds (a1, vx7, vx1 );                    \
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    t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7));    \
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    t7 = vec_mradds (a2, vx5, vx3);                     \
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    t3 = vec_mradds (ma2, vx3, vx5);                    \
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                                                        \
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    /* 2nd stage */                                     \
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    t5 = vec_adds (vx0, vx4);                           \
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    t0 = vec_subs (vx0, vx4);                           \
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    t2 = vec_mradds (a0, vx6, vx2);                     \
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    t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6));    \
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    t6 = vec_adds (t8, t3);                             \
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    t3 = vec_subs (t8, t3);                             \
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    t8 = vec_subs (t1, t7);                             \
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    t1 = vec_adds (t1, t7);                             \
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                                                        \
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    /* 3rd stage */                                     \
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    t7 = vec_adds (t5, t2);                             \
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    t2 = vec_subs (t5, t2);                             \
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    t5 = vec_adds (t0, t4);                             \
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    t0 = vec_subs (t0, t4);                             \
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    t4 = vec_subs (t8, t3);                             \
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    t3 = vec_adds (t8, t3);                             \
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                                                        \
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    /* 4th stage */                                     \
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    vy0 = vec_adds (t7, t1);                            \
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    vy7 = vec_subs (t7, t1);                            \
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    vy1 = vec_mradds (c4, t3, t5);                      \
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    vy6 = vec_mradds (mc4, t3, t5);                     \
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    vy2 = vec_mradds (c4, t4, t0);                      \
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    vy5 = vec_mradds (mc4, t4, t0);                     \
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    vy3 = vec_adds (t2, t6);                            \
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    vy4 = vec_subs (t2, t6);
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#define IDCT                                                            \
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    vec_s16 vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;                \
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    vec_s16 vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;                \
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    vec_s16 a0, a1, a2, ma2, c4, mc4, zero, bias;                  \
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    vec_s16 t0, t1, t2, t3, t4, t5, t6, t7, t8;                    \
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    vec_u16 shift;                                                 \
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                                                                        \
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    c4 = vec_splat (constants[0], 0);                                   \
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    a0 = vec_splat (constants[0], 1);                                   \
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    a1 = vec_splat (constants[0], 2);                                   \
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    a2 = vec_splat (constants[0], 3);                                   \
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    mc4 = vec_splat (constants[0], 4);                                  \
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    ma2 = vec_splat (constants[0], 5);                                  \
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    bias = (vec_s16)vec_splat ((vec_s32)constants[0], 3);     \
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                                                                        \
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    zero = vec_splat_s16 (0);                                           \
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    shift = vec_splat_u16 (4);                                          \
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                                                                        \
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    vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero);    \
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    vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero);    \
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    vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero);    \
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    vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero);    \
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    vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero);    \
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    vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero);    \
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    vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero);    \
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    vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero);    \
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                                                                        \
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    IDCT_HALF                                                           \
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                                                                        \
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    vx0 = vec_mergeh (vy0, vy4);                                        \
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    vx1 = vec_mergel (vy0, vy4);                                        \
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    vx2 = vec_mergeh (vy1, vy5);                                        \
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    vx3 = vec_mergel (vy1, vy5);                                        \
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    vx4 = vec_mergeh (vy2, vy6);                                        \
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    vx5 = vec_mergel (vy2, vy6);                                        \
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    vx6 = vec_mergeh (vy3, vy7);                                        \
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    vx7 = vec_mergel (vy3, vy7);                                        \
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                                                                        \
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    vy0 = vec_mergeh (vx0, vx4);                                        \
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    vy1 = vec_mergel (vx0, vx4);                                        \
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    vy2 = vec_mergeh (vx1, vx5);                                        \
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    vy3 = vec_mergel (vx1, vx5);                                        \
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    vy4 = vec_mergeh (vx2, vx6);                                        \
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    vy5 = vec_mergel (vx2, vx6);                                        \
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    vy6 = vec_mergeh (vx3, vx7);                                        \
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    vy7 = vec_mergel (vx3, vx7);                                        \
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                                                                        \
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    vx0 = vec_adds (vec_mergeh (vy0, vy4), bias);                       \
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    vx1 = vec_mergel (vy0, vy4);                                        \
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    vx2 = vec_mergeh (vy1, vy5);                                        \
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    vx3 = vec_mergel (vy1, vy5);                                        \
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    vx4 = vec_mergeh (vy2, vy6);                                        \
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    vx5 = vec_mergel (vy2, vy6);                                        \
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    vx6 = vec_mergeh (vy3, vy7);                                        \
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    vx7 = vec_mergel (vy3, vy7);                                        \
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                                                                        \
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    IDCT_HALF                                                           \
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                                                                        \
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    shift = vec_splat_u16 (6);                                          \
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    vx0 = vec_sra (vy0, shift);                                         \
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    vx1 = vec_sra (vy1, shift);                                         \
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    vx2 = vec_sra (vy2, shift);                                         \
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    vx3 = vec_sra (vy3, shift);                                         \
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    vx4 = vec_sra (vy4, shift);                                         \
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    vx5 = vec_sra (vy5, shift);                                         \
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    vx6 = vec_sra (vy6, shift);                                         \
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    vx7 = vec_sra (vy7, shift);
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static const vec_s16 constants[5] = {
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    {23170, 13573,  6518, 21895, -23170, -21895,    32,    31},
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    {16384, 22725, 21407, 19266,  16384,  19266, 21407, 22725},
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    {22725, 31521, 29692, 26722,  22725,  26722, 29692, 31521},
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    {21407, 29692, 27969, 25172,  21407,  25172, 27969, 29692},
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    {19266, 26722, 25172, 22654,  19266,  22654, 25172, 26722}
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};
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void idct_put_altivec(uint8_t* dest, int stride, int16_t *blk)
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{
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    vec_s16 *block = (vec_s16*)blk;
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    vec_u8 tmp;
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    IDCT
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#define COPY(dest,src)                                          \
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    tmp = vec_packsu (src, src);                                \
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    vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest);       \
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    vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest);
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    COPY (dest, vx0)    dest += stride;
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    COPY (dest, vx1)    dest += stride;
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    COPY (dest, vx2)    dest += stride;
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    COPY (dest, vx3)    dest += stride;
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    COPY (dest, vx4)    dest += stride;
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    COPY (dest, vx5)    dest += stride;
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    COPY (dest, vx6)    dest += stride;
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    COPY (dest, vx7)
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}
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void idct_add_altivec(uint8_t* dest, int stride, int16_t *blk)
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{
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    vec_s16 *block = (vec_s16*)blk;
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    vec_u8 tmp;
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    vec_s16 tmp2, tmp3;
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    vec_u8 perm0;
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    vec_u8 perm1;
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    vec_u8 p0, p1, p;
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    IDCT
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    p0 = vec_lvsl (0, dest);
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    p1 = vec_lvsl (stride, dest);
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    p = vec_splat_u8 (-1);
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    perm0 = vec_mergeh (p, p0);
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    perm1 = vec_mergeh (p, p1);
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#define ADD(dest,src,perm)                                              \
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    /* *(uint64_t *)&tmp = *(uint64_t *)dest; */                        \
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    tmp = vec_ld (0, dest);                                             \
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    tmp2 = (vec_s16)vec_perm (tmp, (vec_u8)zero, perm);       \
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    tmp3 = vec_adds (tmp2, src);                                        \
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    tmp = vec_packsu (tmp3, tmp3);                                      \
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    vec_ste ((vec_u32)tmp, 0, (unsigned int *)dest);               \
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    vec_ste ((vec_u32)tmp, 4, (unsigned int *)dest);
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    ADD (dest, vx0, perm0)      dest += stride;
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    ADD (dest, vx1, perm1)      dest += stride;
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    ADD (dest, vx2, perm0)      dest += stride;
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    ADD (dest, vx3, perm1)      dest += stride;
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    ADD (dest, vx4, perm0)      dest += stride;
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    ADD (dest, vx5, perm1)      dest += stride;
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    ADD (dest, vx6, perm0)      dest += stride;
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    ADD (dest, vx7, perm1)
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}
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