idct_altivec.c
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上传日期:2014-04-03
资源大小:7248k
文件大小:9k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * Copyright (c) 2001 Michel Lespinasse
- *
- * This library 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 of the License, or (at your option) any later version.
- *
- * This library 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 this library; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
- */
- /*
- * NOTE: This code is based on GPL code from the libmpeg2 project. The
- * author, Michel Lespinasses, has given explicit permission to release
- * under LGPL as part of ffmpeg.
- *
- */
- /*
- * FFMpeg integration by Dieter Shirley
- *
- * This file is a direct copy of the altivec idct module from the libmpeg2
- * project. I've deleted all of the libmpeg2 specific code, renamed the functions and
- * re-ordered the function parameters. The only change to the IDCT function
- * itself was to factor out the partial transposition, and to perform a full
- * transpose at the end of the function.
- */
- #include <stdlib.h> /* malloc(), free() */
- #include <string.h>
- #include "../dsputil.h"
- #include "gcc_fixes.h"
- #include "dsputil_altivec.h"
- #define vector_s16_t vector signed short
- #define const_vector_s16_t const_vector signed short
- #define vector_u16_t vector unsigned short
- #define vector_s8_t vector signed char
- #define vector_u8_t vector unsigned char
- #define vector_s32_t vector signed int
- #define vector_u32_t vector unsigned int
- #define IDCT_HALF
- /* 1st stage */
- t1 = vec_mradds (a1, vx7, vx1 );
- t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7));
- t7 = vec_mradds (a2, vx5, vx3);
- t3 = vec_mradds (ma2, vx3, vx5);
- /* 2nd stage */
- t5 = vec_adds (vx0, vx4);
- t0 = vec_subs (vx0, vx4);
- t2 = vec_mradds (a0, vx6, vx2);
- t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6));
- t6 = vec_adds (t8, t3);
- t3 = vec_subs (t8, t3);
- t8 = vec_subs (t1, t7);
- t1 = vec_adds (t1, t7);
- /* 3rd stage */
- t7 = vec_adds (t5, t2);
- t2 = vec_subs (t5, t2);
- t5 = vec_adds (t0, t4);
- t0 = vec_subs (t0, t4);
- t4 = vec_subs (t8, t3);
- t3 = vec_adds (t8, t3);
- /* 4th stage */
- vy0 = vec_adds (t7, t1);
- vy7 = vec_subs (t7, t1);
- vy1 = vec_mradds (c4, t3, t5);
- vy6 = vec_mradds (mc4, t3, t5);
- vy2 = vec_mradds (c4, t4, t0);
- vy5 = vec_mradds (mc4, t4, t0);
- vy3 = vec_adds (t2, t6);
- vy4 = vec_subs (t2, t6);
- #define IDCT
- vector_s16_t vx0, vx1, vx2, vx3, vx4, vx5, vx6, vx7;
- vector_s16_t vy0, vy1, vy2, vy3, vy4, vy5, vy6, vy7;
- vector_s16_t a0, a1, a2, ma2, c4, mc4, zero, bias;
- vector_s16_t t0, t1, t2, t3, t4, t5, t6, t7, t8;
- vector_u16_t shift;
- c4 = vec_splat (constants[0], 0);
- a0 = vec_splat (constants[0], 1);
- a1 = vec_splat (constants[0], 2);
- a2 = vec_splat (constants[0], 3);
- mc4 = vec_splat (constants[0], 4);
- ma2 = vec_splat (constants[0], 5);
- bias = (vector_s16_t)vec_splat ((vector_s32_t)constants[0], 3);
- zero = vec_splat_s16 (0);
- shift = vec_splat_u16 (4);
- vx0 = vec_mradds (vec_sl (block[0], shift), constants[1], zero);
- vx1 = vec_mradds (vec_sl (block[1], shift), constants[2], zero);
- vx2 = vec_mradds (vec_sl (block[2], shift), constants[3], zero);
- vx3 = vec_mradds (vec_sl (block[3], shift), constants[4], zero);
- vx4 = vec_mradds (vec_sl (block[4], shift), constants[1], zero);
- vx5 = vec_mradds (vec_sl (block[5], shift), constants[4], zero);
- vx6 = vec_mradds (vec_sl (block[6], shift), constants[3], zero);
- vx7 = vec_mradds (vec_sl (block[7], shift), constants[2], zero);
- IDCT_HALF
- vx0 = vec_mergeh (vy0, vy4);
- vx1 = vec_mergel (vy0, vy4);
- vx2 = vec_mergeh (vy1, vy5);
- vx3 = vec_mergel (vy1, vy5);
- vx4 = vec_mergeh (vy2, vy6);
- vx5 = vec_mergel (vy2, vy6);
- vx6 = vec_mergeh (vy3, vy7);
- vx7 = vec_mergel (vy3, vy7);
- vy0 = vec_mergeh (vx0, vx4);
- vy1 = vec_mergel (vx0, vx4);
- vy2 = vec_mergeh (vx1, vx5);
- vy3 = vec_mergel (vx1, vx5);
- vy4 = vec_mergeh (vx2, vx6);
- vy5 = vec_mergel (vx2, vx6);
- vy6 = vec_mergeh (vx3, vx7);
- vy7 = vec_mergel (vx3, vx7);
- vx0 = vec_adds (vec_mergeh (vy0, vy4), bias);
- vx1 = vec_mergel (vy0, vy4);
- vx2 = vec_mergeh (vy1, vy5);
- vx3 = vec_mergel (vy1, vy5);
- vx4 = vec_mergeh (vy2, vy6);
- vx5 = vec_mergel (vy2, vy6);
- vx6 = vec_mergeh (vy3, vy7);
- vx7 = vec_mergel (vy3, vy7);
- IDCT_HALF
- shift = vec_splat_u16 (6);
- vx0 = vec_sra (vy0, shift);
- vx1 = vec_sra (vy1, shift);
- vx2 = vec_sra (vy2, shift);
- vx3 = vec_sra (vy3, shift);
- vx4 = vec_sra (vy4, shift);
- vx5 = vec_sra (vy5, shift);
- vx6 = vec_sra (vy6, shift);
- vx7 = vec_sra (vy7, shift);
- static const_vector_s16_t constants[5] = {
- (vector_s16_t) AVV(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
- (vector_s16_t) AVV(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
- (vector_s16_t) AVV(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
- (vector_s16_t) AVV(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
- (vector_s16_t) AVV(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
- };
- void idct_put_altivec(uint8_t* dest, int stride, vector_s16_t* block)
- {
- POWERPC_PERF_DECLARE(altivec_idct_put_num, 1);
- #ifdef ALTIVEC_USE_REFERENCE_C_CODE
- POWERPC_PERF_START_COUNT(altivec_idct_put_num, 1);
- void simple_idct_put(uint8_t *dest, int line_size, int16_t *block);
- simple_idct_put(dest, stride, (int16_t*)block);
- POWERPC_PERF_STOP_COUNT(altivec_idct_put_num, 1);
- #else /* ALTIVEC_USE_REFERENCE_C_CODE */
- vector_u8_t tmp;
- #ifdef POWERPC_PERFORMANCE_REPORT
- POWERPC_PERF_START_COUNT(altivec_idct_put_num, 1);
- #endif
- IDCT
- #define COPY(dest,src)
- tmp = vec_packsu (src, src);
- vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);
- vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
- COPY (dest, vx0) dest += stride;
- COPY (dest, vx1) dest += stride;
- COPY (dest, vx2) dest += stride;
- COPY (dest, vx3) dest += stride;
- COPY (dest, vx4) dest += stride;
- COPY (dest, vx5) dest += stride;
- COPY (dest, vx6) dest += stride;
- COPY (dest, vx7)
- POWERPC_PERF_STOP_COUNT(altivec_idct_put_num, 1);
- #endif /* ALTIVEC_USE_REFERENCE_C_CODE */
- }
- void idct_add_altivec(uint8_t* dest, int stride, vector_s16_t* block)
- {
- POWERPC_PERF_DECLARE(altivec_idct_add_num, 1);
- #ifdef ALTIVEC_USE_REFERENCE_C_CODE
- POWERPC_PERF_START_COUNT(altivec_idct_add_num, 1);
- void simple_idct_add(uint8_t *dest, int line_size, int16_t *block);
- simple_idct_add(dest, stride, (int16_t*)block);
- POWERPC_PERF_STOP_COUNT(altivec_idct_add_num, 1);
- #else /* ALTIVEC_USE_REFERENCE_C_CODE */
- vector_u8_t tmp;
- vector_s16_t tmp2, tmp3;
- vector_u8_t perm0;
- vector_u8_t perm1;
- vector_u8_t p0, p1, p;
- #ifdef POWERPC_PERFORMANCE_REPORT
- POWERPC_PERF_START_COUNT(altivec_idct_add_num, 1);
- #endif
- IDCT
- p0 = vec_lvsl (0, dest);
- p1 = vec_lvsl (stride, dest);
- p = vec_splat_u8 (-1);
- perm0 = vec_mergeh (p, p0);
- perm1 = vec_mergeh (p, p1);
- #define ADD(dest,src,perm)
- /* *(uint64_t *)&tmp = *(uint64_t *)dest; */
- tmp = vec_ld (0, dest);
- tmp2 = (vector_s16_t)vec_perm (tmp, (vector_u8_t)zero, perm);
- tmp3 = vec_adds (tmp2, src);
- tmp = vec_packsu (tmp3, tmp3);
- vec_ste ((vector_u32_t)tmp, 0, (unsigned int *)dest);
- vec_ste ((vector_u32_t)tmp, 4, (unsigned int *)dest);
- ADD (dest, vx0, perm0) dest += stride;
- ADD (dest, vx1, perm1) dest += stride;
- ADD (dest, vx2, perm0) dest += stride;
- ADD (dest, vx3, perm1) dest += stride;
- ADD (dest, vx4, perm0) dest += stride;
- ADD (dest, vx5, perm1) dest += stride;
- ADD (dest, vx6, perm0) dest += stride;
- ADD (dest, vx7, perm1)
- POWERPC_PERF_STOP_COUNT(altivec_idct_add_num, 1);
- #endif /* ALTIVEC_USE_REFERENCE_C_CODE */
- }