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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
*/
#include <stdint.h>
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/ppc/types_altivec.h"
#include "libavutil/ppc/util_altivec.h"
#include "libavcodec/svq1enc.h"
#if HAVE_ALTIVEC
static int ssd_int8_vs_int16_altivec(const int8_t *pix1, const int16_t *pix2,
int size)
{
int i, size16 = size >> 4;
vector signed char vpix1;
vector signed short vpix2, vdiff, vpix1l, vpix1h;
union {
vector signed int vscore;
int32_t score[4];
} u = { .vscore = vec_splat_s32(0) };
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];
}
#endif /* HAVE_ALTIVEC */
av_cold void ff_svq1enc_init_ppc(SVQ1EncContext *c)
{
#if HAVE_ALTIVEC
if (!PPC_ALTIVEC(av_get_cpu_flags()))
return;
c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
#endif /* HAVE_ALTIVEC */
}
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