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/*
* Copyright (c) 2007 Luca Barbato <lu_zero@gentoo.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
*/
/**
** @file
** integer misc ops.
**/
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavutil/attributes.h"
#include "libavutil/ppc/types_altivec.h"
#include "libavcodec/dsputil.h"
#include "dsputil_altivec.h"
static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
int size) {
int i, size16;
vector signed char vpix1;
vector signed short vpix2, vdiff, vpix1l,vpix1h;
union { vector signed int vscore;
int32_t score[4];
} u;
u.vscore = vec_splat_s32(0);
//
//XXX lazy way, fix it later
#define vec_unaligned_load(b) \
vec_perm(vec_ld(0,b),vec_ld(15,b),vec_lvsl(0, b));
size16 = size >> 4;
while(size16) {
// score += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
//load pix1 and the first batch of pix2
vpix1 = vec_unaligned_load(pix1);
vpix2 = vec_unaligned_load(pix2);
pix2 += 8;
//unpack
vpix1h = vec_unpackh(vpix1);
vdiff = vec_sub(vpix1h, vpix2);
vpix1l = vec_unpackl(vpix1);
// load another batch from pix2
vpix2 = vec_unaligned_load(pix2);
u.vscore = vec_msum(vdiff, vdiff, u.vscore);
vdiff = vec_sub(vpix1l, vpix2);
u.vscore = vec_msum(vdiff, vdiff, u.vscore);
pix1 += 16;
pix2 += 8;
size16--;
}
u.vscore = vec_sums(u.vscore, vec_splat_s32(0));
size %= 16;
for (i = 0; i < size; i++) {
u.score[3] += (pix1[i]-pix2[i])*(pix1[i]-pix2[i]);
}
return u.score[3];
}
static int32_t scalarproduct_int16_altivec(const int16_t *v1, const int16_t *v2,
int order)
{
int i;
LOAD_ZERO;
const vec_s16 *pv;
register vec_s16 vec1;
register vec_s32 res = vec_splat_s32(0), t;
int32_t ires;
for(i = 0; i < order; i += 8){
pv = (const vec_s16*)v1;
vec1 = vec_perm(pv[0], pv[1], vec_lvsl(0, v1));
t = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
res = vec_sums(t, res);
v1 += 8;
v2 += 8;
}
res = vec_splat(res, 3);
vec_ste(res, 0, &ires);
return ires;
}
static int32_t scalarproduct_and_madd_int16_altivec(int16_t *v1, const int16_t *v2, const int16_t *v3, int order, int mul)
{
LOAD_ZERO;
vec_s16 *pv1 = (vec_s16*)v1;
register vec_s16 muls = {mul,mul,mul,mul,mul,mul,mul,mul};
register vec_s16 t0, t1, i0, i1, i4;
register vec_s16 i2 = vec_ld(0, v2), i3 = vec_ld(0, v3);
register vec_s32 res = zero_s32v;
register vec_u8 align = vec_lvsl(0, v2);
int32_t ires;
order >>= 4;
do {
i1 = vec_ld(16, v2);
t0 = vec_perm(i2, i1, align);
i2 = vec_ld(32, v2);
t1 = vec_perm(i1, i2, align);
i0 = pv1[0];
i1 = pv1[1];
res = vec_msum(t0, i0, res);
res = vec_msum(t1, i1, res);
i4 = vec_ld(16, v3);
t0 = vec_perm(i3, i4, align);
i3 = vec_ld(32, v3);
t1 = vec_perm(i4, i3, align);
pv1[0] = vec_mladd(t0, muls, i0);
pv1[1] = vec_mladd(t1, muls, i1);
pv1 += 2;
v2 += 8;
v3 += 8;
} while(--order);
res = vec_splat(vec_sums(res, zero_s32v), 3);
vec_ste(res, 0, &ires);
return ires;
}
av_cold void ff_int_init_altivec(DSPContext *c, AVCodecContext *avctx)
{
c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
c->scalarproduct_int16 = scalarproduct_int16_altivec;
c->scalarproduct_and_madd_int16 = scalarproduct_and_madd_int16_altivec;
}
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