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FFmpeg/libavcodec/ppc/fdct_altivec.c

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/*
* Copyright (C) 2003 James Klicman <james@klicman.org>
*
* This file is part of Libav.
*
* Libav 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.
*
* Libav 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 Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavutil/common.h"
#include "dsputil_altivec.h"
#define vs16(v) ((vector signed short)(v))
#define vs32(v) ((vector signed int)(v))
#define vu8(v) ((vector unsigned char)(v))
#define vu16(v) ((vector unsigned short)(v))
#define vu32(v) ((vector unsigned int)(v))
#define C1 0.98078525066375732421875000 /* cos(1*PI/16) */
#define C2 0.92387950420379638671875000 /* cos(2*PI/16) */
#define C3 0.83146959543228149414062500 /* cos(3*PI/16) */
#define C4 0.70710676908493041992187500 /* cos(4*PI/16) */
#define C5 0.55557024478912353515625000 /* cos(5*PI/16) */
#define C6 0.38268342614173889160156250 /* cos(6*PI/16) */
#define C7 0.19509032368659973144531250 /* cos(7*PI/16) */
#define SQRT_2 1.41421353816986083984375000 /* sqrt(2) */
#define W0 -(2 * C2)
#define W1 (2 * C6)
#define W2 (SQRT_2 * C6)
#define W3 (SQRT_2 * C3)
#define W4 (SQRT_2 * (-C1 + C3 + C5 - C7))
#define W5 (SQRT_2 * ( C1 + C3 - C5 + C7))
#define W6 (SQRT_2 * ( C1 + C3 + C5 - C7))
#define W7 (SQRT_2 * ( C1 + C3 - C5 - C7))
#define W8 (SQRT_2 * ( C7 - C3))
#define W9 (SQRT_2 * (-C1 - C3))
#define WA (SQRT_2 * (-C3 - C5))
#define WB (SQRT_2 * ( C5 - C3))
static vector float fdctconsts[3] = {
{ W0, W1, W2, W3 },
{ W4, W5, W6, W7 },
{ W8, W9, WA, WB }
};
#define LD_W0 vec_splat(cnsts0, 0)
#define LD_W1 vec_splat(cnsts0, 1)
#define LD_W2 vec_splat(cnsts0, 2)
#define LD_W3 vec_splat(cnsts0, 3)
#define LD_W4 vec_splat(cnsts1, 0)
#define LD_W5 vec_splat(cnsts1, 1)
#define LD_W6 vec_splat(cnsts1, 2)
#define LD_W7 vec_splat(cnsts1, 3)
#define LD_W8 vec_splat(cnsts2, 0)
#define LD_W9 vec_splat(cnsts2, 1)
#define LD_WA vec_splat(cnsts2, 2)
#define LD_WB vec_splat(cnsts2, 3)
#define FDCTROW(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */ \
x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
\
b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
\
b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
cnst = LD_W2; \
b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
cnst = LD_W1; \
b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
cnst = LD_W0; \
b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
\
x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
cnst = LD_W3; \
x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
\
cnst = LD_W8; \
x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
cnst = LD_W9; \
x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
cnst = LD_WA; \
x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
cnst = LD_WB; \
x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
\
cnst = LD_W4; \
b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
cnst = LD_W5; \
b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
cnst = LD_W6; \
b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
cnst = LD_W7; \
b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
\
b7 = vec_add(b7, x2); /* b7 = b7 + x2; */ \
b5 = vec_add(b5, x3); /* b5 = b5 + x3; */ \
b3 = vec_add(b3, x2); /* b3 = b3 + x2; */ \
b1 = vec_add(b1, x3); /* b1 = b1 + x3; */ \
/* }}} */
#define FDCTCOL(b0,b1,b2,b3,b4,b5,b6,b7) /* {{{ */ \
x0 = vec_add(b0, b7); /* x0 = b0 + b7; */ \
x7 = vec_sub(b0, b7); /* x7 = b0 - b7; */ \
x1 = vec_add(b1, b6); /* x1 = b1 + b6; */ \
x6 = vec_sub(b1, b6); /* x6 = b1 - b6; */ \
x2 = vec_add(b2, b5); /* x2 = b2 + b5; */ \
x5 = vec_sub(b2, b5); /* x5 = b2 - b5; */ \
x3 = vec_add(b3, b4); /* x3 = b3 + b4; */ \
x4 = vec_sub(b3, b4); /* x4 = b3 - b4; */ \
\
b7 = vec_add(x0, x3); /* b7 = x0 + x3; */ \
b1 = vec_add(x1, x2); /* b1 = x1 + x2; */ \
b0 = vec_add(b7, b1); /* b0 = b7 + b1; */ \
b4 = vec_sub(b7, b1); /* b4 = b7 - b1; */ \
\
b2 = vec_sub(x0, x3); /* b2 = x0 - x3; */ \
b6 = vec_sub(x1, x2); /* b6 = x1 - x2; */ \
b5 = vec_add(b6, b2); /* b5 = b6 + b2; */ \
cnst = LD_W2; \
b5 = vec_madd(cnst, b5, mzero); /* b5 = b5 * W2; */ \
cnst = LD_W1; \
b2 = vec_madd(cnst, b2, b5); /* b2 = b5 + b2 * W1; */ \
cnst = LD_W0; \
b6 = vec_madd(cnst, b6, b5); /* b6 = b5 + b6 * W0; */ \
\
x0 = vec_add(x4, x7); /* x0 = x4 + x7; */ \
x1 = vec_add(x5, x6); /* x1 = x5 + x6; */ \
x2 = vec_add(x4, x6); /* x2 = x4 + x6; */ \
x3 = vec_add(x5, x7); /* x3 = x5 + x7; */ \
x8 = vec_add(x2, x3); /* x8 = x2 + x3; */ \
cnst = LD_W3; \
x8 = vec_madd(cnst, x8, mzero); /* x8 = x8 * W3; */ \
\
cnst = LD_W8; \
x0 = vec_madd(cnst, x0, mzero); /* x0 *= W8; */ \
cnst = LD_W9; \
x1 = vec_madd(cnst, x1, mzero); /* x1 *= W9; */ \
cnst = LD_WA; \
x2 = vec_madd(cnst, x2, x8); /* x2 = x2 * WA + x8; */ \
cnst = LD_WB; \
x3 = vec_madd(cnst, x3, x8); /* x3 = x3 * WB + x8; */ \
\
cnst = LD_W4; \
b7 = vec_madd(cnst, x4, x0); /* b7 = x4 * W4 + x0; */ \
cnst = LD_W5; \
b5 = vec_madd(cnst, x5, x1); /* b5 = x5 * W5 + x1; */ \
cnst = LD_W6; \
b3 = vec_madd(cnst, x6, x1); /* b3 = x6 * W6 + x1; */ \
cnst = LD_W7; \
b1 = vec_madd(cnst, x7, x0); /* b1 = x7 * W7 + x0; */ \
\
b7 = vec_add(b7, x2); /* b7 += x2; */ \
b5 = vec_add(b5, x3); /* b5 += x3; */ \
b3 = vec_add(b3, x2); /* b3 += x2; */ \
b1 = vec_add(b1, x3); /* b1 += x3; */ \
/* }}} */
/* two dimensional discrete cosine transform */
void ff_fdct_altivec(int16_t *block)
{
vector signed short *bp;
vector float *cp;
vector float b00, b10, b20, b30, b40, b50, b60, b70;
vector float b01, b11, b21, b31, b41, b51, b61, b71;
vector float mzero, cnst, cnsts0, cnsts1, cnsts2;
vector float x0, x1, x2, x3, x4, x5, x6, x7, x8;
/* setup constants {{{ */
/* mzero = -0.0 */
mzero = ((vector float)vec_splat_u32(-1));
mzero = ((vector float)vec_sl(vu32(mzero), vu32(mzero)));
cp = fdctconsts;
cnsts0 = vec_ld(0, cp); cp++;
cnsts1 = vec_ld(0, cp); cp++;
cnsts2 = vec_ld(0, cp);
/* }}} */
/* 8x8 matrix transpose (vector short[8]) {{{ */
#define MERGE_S16(hl,a,b) vec_merge##hl(vs16(a), vs16(b))
bp = (vector signed short*)block;
b00 = ((vector float)vec_ld(0, bp));
b40 = ((vector float)vec_ld(16*4, bp));
b01 = ((vector float)MERGE_S16(h, b00, b40));
b11 = ((vector float)MERGE_S16(l, b00, b40));
bp++;
b10 = ((vector float)vec_ld(0, bp));
b50 = ((vector float)vec_ld(16*4, bp));
b21 = ((vector float)MERGE_S16(h, b10, b50));
b31 = ((vector float)MERGE_S16(l, b10, b50));
bp++;
b20 = ((vector float)vec_ld(0, bp));
b60 = ((vector float)vec_ld(16*4, bp));
b41 = ((vector float)MERGE_S16(h, b20, b60));
b51 = ((vector float)MERGE_S16(l, b20, b60));
bp++;
b30 = ((vector float)vec_ld(0, bp));
b70 = ((vector float)vec_ld(16*4, bp));
b61 = ((vector float)MERGE_S16(h, b30, b70));
b71 = ((vector float)MERGE_S16(l, b30, b70));
x0 = ((vector float)MERGE_S16(h, b01, b41));
x1 = ((vector float)MERGE_S16(l, b01, b41));
x2 = ((vector float)MERGE_S16(h, b11, b51));
x3 = ((vector float)MERGE_S16(l, b11, b51));
x4 = ((vector float)MERGE_S16(h, b21, b61));
x5 = ((vector float)MERGE_S16(l, b21, b61));
x6 = ((vector float)MERGE_S16(h, b31, b71));
x7 = ((vector float)MERGE_S16(l, b31, b71));
b00 = ((vector float)MERGE_S16(h, x0, x4));
b10 = ((vector float)MERGE_S16(l, x0, x4));
b20 = ((vector float)MERGE_S16(h, x1, x5));
b30 = ((vector float)MERGE_S16(l, x1, x5));
b40 = ((vector float)MERGE_S16(h, x2, x6));
b50 = ((vector float)MERGE_S16(l, x2, x6));
b60 = ((vector float)MERGE_S16(h, x3, x7));
b70 = ((vector float)MERGE_S16(l, x3, x7));
#undef MERGE_S16
/* }}} */
/* Some of the initial calculations can be done as vector short before
* conversion to vector float. The following code section takes advantage
* of this.
*/
/* fdct rows {{{ */
x0 = ((vector float)vec_add(vs16(b00), vs16(b70)));
x7 = ((vector float)vec_sub(vs16(b00), vs16(b70)));
x1 = ((vector float)vec_add(vs16(b10), vs16(b60)));
x6 = ((vector float)vec_sub(vs16(b10), vs16(b60)));
x2 = ((vector float)vec_add(vs16(b20), vs16(b50)));
x5 = ((vector float)vec_sub(vs16(b20), vs16(b50)));
x3 = ((vector float)vec_add(vs16(b30), vs16(b40)));
x4 = ((vector float)vec_sub(vs16(b30), vs16(b40)));
b70 = ((vector float)vec_add(vs16(x0), vs16(x3)));
b10 = ((vector float)vec_add(vs16(x1), vs16(x2)));
b00 = ((vector float)vec_add(vs16(b70), vs16(b10)));
b40 = ((vector float)vec_sub(vs16(b70), vs16(b10)));
#define CTF0(n) \
b##n##1 = ((vector float)vec_unpackl(vs16(b##n##0))); \
b##n##0 = ((vector float)vec_unpackh(vs16(b##n##0))); \
b##n##1 = vec_ctf(vs32(b##n##1), 0); \
b##n##0 = vec_ctf(vs32(b##n##0), 0);
CTF0(0);
CTF0(4);
b20 = ((vector float)vec_sub(vs16(x0), vs16(x3)));
b60 = ((vector float)vec_sub(vs16(x1), vs16(x2)));
CTF0(2);
CTF0(6);
#undef CTF0
x0 = vec_add(b60, b20);
x1 = vec_add(b61, b21);
cnst = LD_W2;
x0 = vec_madd(cnst, x0, mzero);
x1 = vec_madd(cnst, x1, mzero);
cnst = LD_W1;
b20 = vec_madd(cnst, b20, x0);
b21 = vec_madd(cnst, b21, x1);
cnst = LD_W0;
b60 = vec_madd(cnst, b60, x0);
b61 = vec_madd(cnst, b61, x1);
#define CTFX(x,b) \
b##0 = ((vector float)vec_unpackh(vs16(x))); \
b##1 = ((vector float)vec_unpackl(vs16(x))); \
b##0 = vec_ctf(vs32(b##0), 0); \
b##1 = vec_ctf(vs32(b##1), 0); \
CTFX(x4, b7);
CTFX(x5, b5);
CTFX(x6, b3);
CTFX(x7, b1);
#undef CTFX
x0 = vec_add(b70, b10);
x1 = vec_add(b50, b30);
x2 = vec_add(b70, b30);
x3 = vec_add(b50, b10);
x8 = vec_add(x2, x3);
cnst = LD_W3;
x8 = vec_madd(cnst, x8, mzero);
cnst = LD_W8;
x0 = vec_madd(cnst, x0, mzero);
cnst = LD_W9;
x1 = vec_madd(cnst, x1, mzero);
cnst = LD_WA;
x2 = vec_madd(cnst, x2, x8);
cnst = LD_WB;
x3 = vec_madd(cnst, x3, x8);
cnst = LD_W4;
b70 = vec_madd(cnst, b70, x0);
cnst = LD_W5;
b50 = vec_madd(cnst, b50, x1);
cnst = LD_W6;
b30 = vec_madd(cnst, b30, x1);
cnst = LD_W7;
b10 = vec_madd(cnst, b10, x0);
b70 = vec_add(b70, x2);
b50 = vec_add(b50, x3);
b30 = vec_add(b30, x2);
b10 = vec_add(b10, x3);
x0 = vec_add(b71, b11);
x1 = vec_add(b51, b31);
x2 = vec_add(b71, b31);
x3 = vec_add(b51, b11);
x8 = vec_add(x2, x3);
cnst = LD_W3;
x8 = vec_madd(cnst, x8, mzero);
cnst = LD_W8;
x0 = vec_madd(cnst, x0, mzero);
cnst = LD_W9;
x1 = vec_madd(cnst, x1, mzero);
cnst = LD_WA;
x2 = vec_madd(cnst, x2, x8);
cnst = LD_WB;
x3 = vec_madd(cnst, x3, x8);
cnst = LD_W4;
b71 = vec_madd(cnst, b71, x0);
cnst = LD_W5;
b51 = vec_madd(cnst, b51, x1);
cnst = LD_W6;
b31 = vec_madd(cnst, b31, x1);
cnst = LD_W7;
b11 = vec_madd(cnst, b11, x0);
b71 = vec_add(b71, x2);
b51 = vec_add(b51, x3);
b31 = vec_add(b31, x2);
b11 = vec_add(b11, x3);
/* }}} */
/* 8x8 matrix transpose (vector float[8][2]) {{{ */
x0 = vec_mergel(b00, b20);
x1 = vec_mergeh(b00, b20);
x2 = vec_mergel(b10, b30);
x3 = vec_mergeh(b10, b30);
b00 = vec_mergeh(x1, x3);
b10 = vec_mergel(x1, x3);
b20 = vec_mergeh(x0, x2);
b30 = vec_mergel(x0, x2);
x4 = vec_mergel(b41, b61);
x5 = vec_mergeh(b41, b61);
x6 = vec_mergel(b51, b71);
x7 = vec_mergeh(b51, b71);
b41 = vec_mergeh(x5, x7);
b51 = vec_mergel(x5, x7);
b61 = vec_mergeh(x4, x6);
b71 = vec_mergel(x4, x6);
x0 = vec_mergel(b01, b21);
x1 = vec_mergeh(b01, b21);
x2 = vec_mergel(b11, b31);
x3 = vec_mergeh(b11, b31);
x4 = vec_mergel(b40, b60);
x5 = vec_mergeh(b40, b60);
x6 = vec_mergel(b50, b70);
x7 = vec_mergeh(b50, b70);
b40 = vec_mergeh(x1, x3);
b50 = vec_mergel(x1, x3);
b60 = vec_mergeh(x0, x2);
b70 = vec_mergel(x0, x2);
b01 = vec_mergeh(x5, x7);
b11 = vec_mergel(x5, x7);
b21 = vec_mergeh(x4, x6);
b31 = vec_mergel(x4, x6);
/* }}} */
FDCTCOL(b00, b10, b20, b30, b40, b50, b60, b70);
FDCTCOL(b01, b11, b21, b31, b41, b51, b61, b71);
/* round, convert back to short {{{ */
#define CTS(n) \
b##n##0 = vec_round(b##n##0); \
b##n##1 = vec_round(b##n##1); \
b##n##0 = ((vector float)vec_cts(b##n##0, 0)); \
b##n##1 = ((vector float)vec_cts(b##n##1, 0)); \
b##n##0 = ((vector float)vec_pack(vs32(b##n##0), vs32(b##n##1))); \
vec_st(vs16(b##n##0), 0, bp);
bp = (vector signed short*)block;
CTS(0); bp++;
CTS(1); bp++;
CTS(2); bp++;
CTS(3); bp++;
CTS(4); bp++;
CTS(5); bp++;
CTS(6); bp++;
CTS(7);
#undef CTS
/* }}} */
}
/* vim:set foldmethod=marker foldlevel=0: */