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mirror of https://git.videolan.org/git/ffmpeg.git synced 2024-10-05 18:01:59 +02:00
ffmpeg/libavcodec/ppc/int_altivec.c
Måns Rullgård afe08a728a PPC: remove unnecessary alignment on local variables
Storing a single element from a vector where all elements have the same
value does not require an aligned destination.  Which element is stored
depends on the alignment of the destination address, but since they all
have the same value, the result is the same regardless of the alignment.

Originally committed as revision 19696 to svn://svn.ffmpeg.org/ffmpeg/trunk
2009-08-24 21:42:22 +00:00

147 lines
4.2 KiB
C

/*
* Copyright (c) 2007 Luca Barbato <lu_zero@gentoo.org>
*
* This file is part of FFmpeg.
*
* FFmpeg 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.
*
* FFmpeg 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 FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
** @file libavcodec/ppc/int_altivec.c
** integer misc ops.
**/
#include "config.h"
#if HAVE_ALTIVEC_H
#include <altivec.h>
#endif
#include "libavcodec/dsputil.h"
#include "dsputil_altivec.h"
#include "types_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 void add_int16_altivec(int16_t * v1, int16_t * v2, int order)
{
int i;
register vec_s16 vec, *pv;
for(i = 0; i < order; i += 8){
pv = (vec_s16*)v2;
vec = vec_perm(pv[0], pv[1], vec_lvsl(0, v2));
vec_st(vec_add(vec_ld(0, v1), vec), 0, v1);
v1 += 8;
v2 += 8;
}
}
static void sub_int16_altivec(int16_t * v1, int16_t * v2, int order)
{
int i;
register vec_s16 vec, *pv;
for(i = 0; i < order; i += 8){
pv = (vec_s16*)v2;
vec = vec_perm(pv[0], pv[1], vec_lvsl(0, v2));
vec_st(vec_sub(vec_ld(0, v1), vec), 0, v1);
v1 += 8;
v2 += 8;
}
}
static int32_t scalarproduct_int16_altivec(int16_t * v1, int16_t * v2, int order, const int shift)
{
int i;
LOAD_ZERO;
register vec_s16 vec1, *pv;
register vec_s32 res = vec_splat_s32(0), t;
register vec_u32 shifts;
int32_t ires;
shifts = zero_u32v;
if(shift & 0x10) shifts = vec_add(shifts, vec_sl(vec_splat_u32(0x08), vec_splat_u32(0x1)));
if(shift & 0x08) shifts = vec_add(shifts, vec_splat_u32(0x08));
if(shift & 0x04) shifts = vec_add(shifts, vec_splat_u32(0x04));
if(shift & 0x02) shifts = vec_add(shifts, vec_splat_u32(0x02));
if(shift & 0x01) shifts = vec_add(shifts, vec_splat_u32(0x01));
for(i = 0; i < order; i += 8){
pv = (vec_s16*)v1;
vec1 = vec_perm(pv[0], pv[1], vec_lvsl(0, v1));
t = vec_msum(vec1, vec_ld(0, v2), zero_s32v);
t = vec_sr(t, shifts);
res = vec_sums(t, res);
v1 += 8;
v2 += 8;
}
res = vec_splat(res, 3);
vec_ste(res, 0, &ires);
return ires;
}
void int_init_altivec(DSPContext* c, AVCodecContext *avctx)
{
c->ssd_int8_vs_int16 = ssd_int8_vs_int16_altivec;
c->add_int16 = add_int16_altivec;
c->sub_int16 = sub_int16_altivec;
c->scalarproduct_int16 = scalarproduct_int16_altivec;
}