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/*
* idct_altivec.c
* Copyright (C) 2000-2002 Michel Lespinasse <walken@zoy.org>
* Copyright (C) 1999-2000 Aaron Holtzman <aholtzma@ess.engr.uvic.ca>
*
* This file is part of mpeg2dec, a free MPEG-2 video stream decoder.
* See http://libmpeg2.sourceforge.net/ for updates.
*
* mpeg2dec is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* mpeg2dec 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "config.h"
#if defined (ARCH_PPC) && defined (ENABLE_ALTIVEC)
#include <altivec.h>
#include <inttypes.h>
#include "mpeg2_internal.h"
#include <xine/xineutils.h>
#define vector_s16_t 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);
#if defined( __APPLE_CC__ ) && defined( __APPLE_ALTIVEC__ ) /* apple */
#define VEC_S16(a,b,c,d,e,f,g,h) (vector_s16_t) (a, b, c, d, e, f, g, h)
#else /* gnu */
#define VEC_S16(a,b,c,d,e,f,g,h) (vector_s16_t) {a, b, c, d, e, f, g, h}
#endif
static vector_s16_t constants[5] = {
VEC_S16(23170, 13573, 6518, 21895, -23170, -21895, 32, 31),
VEC_S16(16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725),
VEC_S16(22725, 31521, 29692, 26722, 22725, 26722, 29692, 31521),
VEC_S16(21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692),
VEC_S16(19266, 26722, 25172, 22654, 19266, 22654, 25172, 26722)
};
void mpeg2_idct_copy_altivec (vector_s16_t * block, unsigned char * dest,
int stride)
{
vector_u8_t tmp;
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)
memset (block, 0, 64 * sizeof (signed short));
}
void mpeg2_idct_add_altivec (vector_s16_t * block, unsigned char * dest,
int stride)
{
vector_u8_t tmp;
vector_s16_t tmp2, tmp3;
vector_u8_t perm0;
vector_u8_t perm1;
vector_u8_t p0, p1, p;
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)
memset (block, 0, 64 * sizeof (signed short));
}
void mpeg2_idct_altivec_init (void)
{
int i, j;
/* the altivec idct uses a transposed input, so we patch scan tables */
for (i = 0; i < 64; i++) {
j = mpeg2_scan_norm[i];
mpeg2_scan_norm[i] = (j >> 3) | ((j & 7) << 3);
j = mpeg2_scan_alt[i];
mpeg2_scan_alt[i] = (j >> 3) | ((j & 7) << 3);
}
}
#endif /* ARCH_PPC && ENABLED_ALTIVEC */
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