/*
* idct_altivec.c
* Copyright (C) 2000-2003 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "config.h"
#ifdef ARCH_PPC
#ifdef HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include <inttypes.h>
#include "mpeg2.h"
#include "attributes.h"
#include "mpeg2_internal.h"
typedef vector signed char vector_s8_t;
typedef vector unsigned char vector_u8_t;
typedef vector signed short vector_s16_t;
typedef vector unsigned short vector_u16_t;
typedef vector signed int vector_s32_t;
typedef vector unsigned int vector_u32_t;
#if defined(HAVE_ALTIVEC_H) && !defined(__APPLE_CC__) && (__GNUC__ * 100 + __GNUC_MINOR__ < 303)
/* work around gcc <3.3 vec_mergel bug */
static inline vector_s16_t my_vec_mergel (vector_s16_t const A,
vector_s16_t const B)
{
static const vector_u8_t mergel = {
0x08, 0x09, 0x18, 0x19, 0x0a, 0x0b, 0x1a, 0x1b,
0x0c, 0x0d, 0x1c, 0x1d, 0x0e, 0x0f, 0x1e, 0x1f
};
return vec_perm (A, B, mergel);
}
#undef vec_mergel
#define vec_mergel my_vec_mergel
#endif
#ifdef HAVE_ALTIVEC_H /* gnu */
#define VEC_S16(a,b,c,d,e,f,g,h) {a, b, c, d, e, f, g, h}
#else /* apple */
#define VEC_S16(a,b,c,d,e,f,g,h) (vector_s16_t) (a, b, c, d, e, f, g, h)
#endif
static const vector_s16_t constants ATTR_ALIGN(16) =
VEC_S16 (23170, 13573, 6518, 21895, -23170, -21895, 32, 31);
static const vector_s16_t constants_1 ATTR_ALIGN(16) =
VEC_S16 (16384, 22725, 21407, 19266, 16384, 19266, 21407, 22725);
static const vector_s16_t constants_2 ATTR_ALIGN(16) =
VEC_S16 (16069, 22289, 20995, 18895, 16069, 18895, 20995, 22289);
static const vector_s16_t constants_3 ATTR_ALIGN(16) =
VEC_S16 (21407, 29692, 27969, 25172, 21407, 25172, 27969, 29692);
static const vector_s16_t constants_4 ATTR_ALIGN(16) =
VEC_S16 (13623, 18895, 17799, 16019, 13623, 16019, 17799, 18895);
#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); \
a0 = vec_splat (constants, 1); \
a1 = vec_splat (constants, 2); \
a2 = vec_splat (constants, 3); \
mc4 = vec_splat (constants, 4); \
ma2 = vec_splat (constants, 5); \
bias = (vector_s16_t)vec_splat ((vector_s32_t)constants, 3); \
\
zero = vec_splat_s16 (0); \
\
vx0 = vec_adds (block[0], block[4]); \
vx4 = vec_subs (block[0], block[4]); \
t5 = vec_mradds (vx0, constants_1, zero); \
t0 = vec_mradds (vx4, constants_1, zero); \
\
vx1 = vec_mradds (a1, block[7], block[1]); \
vx7 = vec_mradds (a1, block[1], vec_subs (zero, block[7])); \
t1 = vec_mradds (vx1, constants_2, zero); \
t8 = vec_mradds (vx7, constants_2, zero); \
\
vx2 = vec_mradds (a0, block[6], block[2]); \
vx6 = vec_mradds (a0, block[2], vec_subs (zero, block[6])); \
t2 = vec_mradds (vx2, constants_3, zero); \
t4 = vec_mradds (vx6, constants_3, zero); \
\
vx3 = vec_mradds (block[3], constants_4, zero); \
vx5 = vec_mradds (block[5], constants_4, zero); \
t7 = vec_mradds (a2, vx5, vx3); \
t3 = vec_mradds (ma2, vx3, vx5); \
\
t6 = vec_adds (t8, t3); \
t3 = vec_subs (t8, t3); \
t8 = vec_subs (t1, t7); \
t1 = vec_adds (t1, t7); \
t6 = vec_mradds (a0, t6, t6); /* a0+1 == 2*c4 */ \
t1 = vec_mradds (a0, t1, t1); /* a0+1 == 2*c4 */ \
\
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); \
\
vy0 = vec_adds (t7, t1); \
vy7 = vec_subs (t7, t1); \
vy1 = vec_adds (t5, t3); \
vy6 = vec_subs (t5, t3); \
vy2 = vec_adds (t0, t4); \
vy5 = vec_subs (t0, t4); \
vy3 = vec_adds (t2, t6); \
vy4 = vec_subs (t2, t6); \
\
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_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); \
\
vx0 = vec_adds (vx0, bias); \
t5 = vec_adds (vx0, vx4); \
t0 = vec_subs (vx0, vx4); \
\
t1 = vec_mradds (a1, vx7, vx1); \
t8 = vec_mradds (a1, vx1, vec_subs (zero, vx7)); \
\
t2 = vec_mradds (a0, vx6, vx2); \
t4 = vec_mradds (a0, vx2, vec_subs (zero, vx6)); \
\
t7 = vec_mradds (a2, vx5, vx3); \
t3 = vec_mradds (ma2, vx3, vx5); \
\
t6 = vec_adds (t8, t3); \
t3 = vec_subs (t8, t3); \
t8 = vec_subs (t1, t7); \
t1 = vec_adds (t1, t7); \
\
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); \
\
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); \
\
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);
void mpeg2_idct_copy_altivec (int16_t * const _block, uint8_t * dest,
const int stride)
{
vector_s16_t * const block = (vector_s16_t *)_block;
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)
block[0] = block[1] = block[2] = block[3] = zero;
block[4] = block[5] = block[6] = block[7] = zero;
}
void mpeg2_idct_add_altivec (const int last, int16_t * const _block,
uint8_t * dest, const int stride)
{
vector_s16_t * const block = (vector_s16_t *)_block;
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)
block[0] = block[1] = block[2] = block[3] = zero;
block[4] = block[5] = block[6] = block[7] = zero;
}
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