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ffmpeg/libavcodec/ppc/hpeldsp_altivec.c
Andreas Rheinhardt 356610a2ac avcodec/ppc/hpeldsp_altivec: Fix left-shift of negative number 
It is UB and affected e.g. the vp5 and vp61 FATE tests:
https://fate.ffmpeg.org/report.cgi?time=20240327083327&slot=ppc-linux-gcc-13.2-ubsan-altivec-qemu

Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2024-04-02 00:21:58 +02:00

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/*
* Copyright (c) 2002 Brian Foley
* Copyright (c) 2002 Dieter Shirley
* Copyright (c) 2003-2004 Romain Dolbeau <romain@dolbeau.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
*/
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/cpu.h"
#include "libavutil/ppc/cpu.h"
#include "libavutil/ppc/util_altivec.h"
#include "libavcodec/hpeldsp.h"
#include "hpeldsp_altivec.h"
#if HAVE_ALTIVEC
/* next one assumes that ((line_size % 16) == 0) */
void ff_put_pixels16_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
{
register vector unsigned char pixelsv1;
register vector unsigned char pixelsv1B;
register vector unsigned char pixelsv1C;
register vector unsigned char pixelsv1D;
int i;
register ptrdiff_t line_size_2 = line_size * (1 << 1);
register ptrdiff_t line_size_3 = line_size + line_size_2;
register ptrdiff_t line_size_4 = line_size * (1 << 2);
// hand-unrolling the loop by 4 gains about 15%
// mininum execution time goes from 74 to 60 cycles
// it's faster than -funroll-loops, but using
// -funroll-loops w/ this is bad - 74 cycles again.
// all this is on a 7450, tuning for the 7450
for (i = 0; i < h; i += 4) {
pixelsv1 = unaligned_load( 0, pixels);
pixelsv1B = unaligned_load(line_size, pixels);
pixelsv1C = unaligned_load(line_size_2, pixels);
pixelsv1D = unaligned_load(line_size_3, pixels);
VEC_ST(pixelsv1, 0, (unsigned char*)block);
VEC_ST(pixelsv1B, line_size, (unsigned char*)block);
VEC_ST(pixelsv1C, line_size_2, (unsigned char*)block);
VEC_ST(pixelsv1D, line_size_3, (unsigned char*)block);
pixels+=line_size_4;
block +=line_size_4;
}
}
/* next one assumes that ((line_size % 16) == 0) */
#define op_avg(a,b) a = ( ((a)|(b)) - ((((a)^(b))&0xFEFEFEFEUL)>>1) )
void ff_avg_pixels16_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
{
register vector unsigned char pixelsv, blockv;
int i;
for (i = 0; i < h; i++) {
blockv = vec_ld(0, block);
pixelsv = VEC_LD( 0, pixels);
blockv = vec_avg(blockv,pixelsv);
vec_st(blockv, 0, (unsigned char*)block);
pixels+=line_size;
block +=line_size;
}
}
/* next one assumes that ((line_size % 8) == 0) */
static void avg_pixels8_altivec(uint8_t * block, const uint8_t * pixels, ptrdiff_t line_size, int h)
{
register vector unsigned char pixelsv, blockv;
int i;
for (i = 0; i < h; i++) {
/* block is 8 bytes-aligned, so we're either in the
left block (16 bytes-aligned) or in the right block (not) */
int rightside = ((unsigned long)block & 0x0000000F);
blockv = vec_ld(0, block);
pixelsv = VEC_LD( 0, pixels);
if (rightside) {
pixelsv = vec_perm(blockv, pixelsv, vcprm(0,1,s0,s1));
} else {
pixelsv = vec_perm(blockv, pixelsv, vcprm(s0,s1,2,3));
}
blockv = vec_avg(blockv, pixelsv);
vec_st(blockv, 0, block);
pixels += line_size;
block += line_size;
}
}
/* next one assumes that ((line_size % 8) == 0) */
static void put_pixels8_xy2_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
{
register int i;
register vector unsigned char pixelsv1, pixelsv2, pixelsavg;
register vector unsigned char blockv;
register vector unsigned short pixelssum1, pixelssum2, temp3;
register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
register const vector unsigned short vctwo = (const vector unsigned short)vec_splat_u16(2);
pixelsv1 = VEC_LD(0, pixels);
pixelsv2 = VEC_LD(1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum1 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
pixelssum1 = vec_add(pixelssum1, vctwo);
for (i = 0; i < h ; i++) {
int rightside = ((unsigned long)block & 0x0000000F);
blockv = vec_ld(0, block);
pixelsv1 = unaligned_load(line_size, pixels);
pixelsv2 = unaligned_load(line_size+1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum2 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
temp3 = vec_add(pixelssum1, pixelssum2);
temp3 = vec_sra(temp3, vctwo);
pixelssum1 = vec_add(pixelssum2, vctwo);
pixelsavg = vec_packsu(temp3, (vector unsigned short) vczero);
if (rightside) {
blockv = vec_perm(blockv, pixelsavg, vcprm(0, 1, s0, s1));
} else {
blockv = vec_perm(blockv, pixelsavg, vcprm(s0, s1, 2, 3));
}
vec_st(blockv, 0, block);
block += line_size;
pixels += line_size;
}
}
/* next one assumes that ((line_size % 8) == 0) */
static void put_no_rnd_pixels8_xy2_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
{
register int i;
register vector unsigned char pixelsv1, pixelsv2, pixelsavg;
register vector unsigned char blockv;
register vector unsigned short pixelssum1, pixelssum2, temp3;
register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
register const vector unsigned short vcone = (const vector unsigned short)vec_splat_u16(1);
register const vector unsigned short vctwo = (const vector unsigned short)vec_splat_u16(2);
pixelsv1 = VEC_LD(0, pixels);
pixelsv2 = VEC_LD(1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum1 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
pixelssum1 = vec_add(pixelssum1, vcone);
for (i = 0; i < h ; i++) {
int rightside = ((unsigned long)block & 0x0000000F);
blockv = vec_ld(0, block);
pixelsv1 = unaligned_load(line_size, pixels);
pixelsv2 = unaligned_load(line_size+1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum2 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
temp3 = vec_add(pixelssum1, pixelssum2);
temp3 = vec_sra(temp3, vctwo);
pixelssum1 = vec_add(pixelssum2, vcone);
pixelsavg = vec_packsu(temp3, (vector unsigned short) vczero);
if (rightside) {
blockv = vec_perm(blockv, pixelsavg, vcprm(0, 1, s0, s1));
} else {
blockv = vec_perm(blockv, pixelsavg, vcprm(s0, s1, 2, 3));
}
vec_st(blockv, 0, block);
block += line_size;
pixels += line_size;
}
}
/* next one assumes that ((line_size % 16) == 0) */
static void put_pixels16_xy2_altivec(uint8_t * block, const uint8_t * pixels, ptrdiff_t line_size, int h)
{
register int i;
register vector unsigned char pixelsv1, pixelsv2, pixelsv3, pixelsv4;
register vector unsigned char blockv;
register vector unsigned short temp3, temp4,
pixelssum1, pixelssum2, pixelssum3, pixelssum4;
register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
register const vector unsigned short vctwo = (const vector unsigned short)vec_splat_u16(2);
pixelsv1 = VEC_LD(0, pixels);
pixelsv2 = VEC_LD(1, pixels);
pixelsv3 = VEC_MERGEL(vczero, pixelsv1);
pixelsv4 = VEC_MERGEL(vczero, pixelsv2);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum3 = vec_add((vector unsigned short)pixelsv3,
(vector unsigned short)pixelsv4);
pixelssum3 = vec_add(pixelssum3, vctwo);
pixelssum1 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
pixelssum1 = vec_add(pixelssum1, vctwo);
for (i = 0; i < h ; i++) {
blockv = vec_ld(0, block);
pixelsv1 = unaligned_load(line_size, pixels);
pixelsv2 = unaligned_load(line_size+1, pixels);
pixelsv3 = VEC_MERGEL(vczero, pixelsv1);
pixelsv4 = VEC_MERGEL(vczero, pixelsv2);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum4 = vec_add((vector unsigned short)pixelsv3,
(vector unsigned short)pixelsv4);
pixelssum2 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
temp4 = vec_add(pixelssum3, pixelssum4);
temp4 = vec_sra(temp4, vctwo);
temp3 = vec_add(pixelssum1, pixelssum2);
temp3 = vec_sra(temp3, vctwo);
pixelssum3 = vec_add(pixelssum4, vctwo);
pixelssum1 = vec_add(pixelssum2, vctwo);
blockv = vec_packsu(temp3, temp4);
vec_st(blockv, 0, block);
block += line_size;
pixels += line_size;
}
}
/* next one assumes that ((line_size % 16) == 0) */
static void put_no_rnd_pixels16_xy2_altivec(uint8_t * block, const uint8_t * pixels, ptrdiff_t line_size, int h)
{
register int i;
register vector unsigned char pixelsv1, pixelsv2, pixelsv3, pixelsv4;
register vector unsigned char blockv;
register vector unsigned short temp3, temp4,
pixelssum1, pixelssum2, pixelssum3, pixelssum4;
register const vector unsigned char vczero = (const vector unsigned char)vec_splat_u8(0);
register const vector unsigned short vcone = (const vector unsigned short)vec_splat_u16(1);
register const vector unsigned short vctwo = (const vector unsigned short)vec_splat_u16(2);
pixelsv1 = VEC_LD(0, pixels);
pixelsv2 = VEC_LD(1, pixels);
pixelsv3 = VEC_MERGEL(vczero, pixelsv1);
pixelsv4 = VEC_MERGEL(vczero, pixelsv2);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum3 = vec_add((vector unsigned short)pixelsv3,
(vector unsigned short)pixelsv4);
pixelssum3 = vec_add(pixelssum3, vcone);
pixelssum1 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
pixelssum1 = vec_add(pixelssum1, vcone);
for (i = 0; i < h ; i++) {
pixelsv1 = unaligned_load(line_size, pixels);
pixelsv2 = unaligned_load(line_size+1, pixels);
pixelsv3 = VEC_MERGEL(vczero, pixelsv1);
pixelsv4 = VEC_MERGEL(vczero, pixelsv2);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum4 = vec_add((vector unsigned short)pixelsv3,
(vector unsigned short)pixelsv4);
pixelssum2 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
temp4 = vec_add(pixelssum3, pixelssum4);
temp4 = vec_sra(temp4, vctwo);
temp3 = vec_add(pixelssum1, pixelssum2);
temp3 = vec_sra(temp3, vctwo);
pixelssum3 = vec_add(pixelssum4, vcone);
pixelssum1 = vec_add(pixelssum2, vcone);
blockv = vec_packsu(temp3, temp4);
VEC_ST(blockv, 0, block);
block += line_size;
pixels += line_size;
}
}
/* next one assumes that ((line_size % 8) == 0) */
static void avg_pixels8_xy2_altivec(uint8_t *block, const uint8_t *pixels, ptrdiff_t line_size, int h)
{
register int i;
register vector unsigned char pixelsv1, pixelsv2, pixelsavg;
register vector unsigned char blockv, blocktemp;
register vector unsigned short pixelssum1, pixelssum2, temp3;
register const vector unsigned char vczero = (const vector unsigned char)
vec_splat_u8(0);
register const vector unsigned short vctwo = (const vector unsigned short)
vec_splat_u16(2);
pixelsv1 = VEC_LD(0, pixels);
pixelsv2 = VEC_LD(1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum1 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
pixelssum1 = vec_add(pixelssum1, vctwo);
for (i = 0; i < h ; i++) {
int rightside = ((unsigned long)block & 0x0000000F);
blockv = vec_ld(0, block);
pixelsv1 = unaligned_load(line_size, pixels);
pixelsv2 = unaligned_load(line_size+1, pixels);
pixelsv1 = VEC_MERGEH(vczero, pixelsv1);
pixelsv2 = VEC_MERGEH(vczero, pixelsv2);
pixelssum2 = vec_add((vector unsigned short)pixelsv1,
(vector unsigned short)pixelsv2);
temp3 = vec_add(pixelssum1, pixelssum2);
temp3 = vec_sra(temp3, vctwo);
pixelssum1 = vec_add(pixelssum2, vctwo);
pixelsavg = vec_packsu(temp3, (vector unsigned short) vczero);
if (rightside) {
blocktemp = vec_perm(blockv, pixelsavg, vcprm(0, 1, s0, s1));
} else {
blocktemp = vec_perm(blockv, pixelsavg, vcprm(s0, s1, 2, 3));
}
blockv = vec_avg(blocktemp, blockv);
vec_st(blockv, 0, block);
block += line_size;
pixels += line_size;
}
}
#endif /* HAVE_ALTIVEC */
av_cold void ff_hpeldsp_init_ppc(HpelDSPContext *c, int flags)
{
#if HAVE_ALTIVEC
if (!PPC_ALTIVEC(av_get_cpu_flags()))
return;
c->avg_pixels_tab[0][0] = ff_avg_pixels16_altivec;
c->avg_pixels_tab[1][0] = avg_pixels8_altivec;
c->avg_pixels_tab[1][3] = avg_pixels8_xy2_altivec;
c->put_pixels_tab[0][0] = ff_put_pixels16_altivec;
c->put_pixels_tab[1][3] = put_pixels8_xy2_altivec;
c->put_pixels_tab[0][3] = put_pixels16_xy2_altivec;
c->put_no_rnd_pixels_tab[0][0] = ff_put_pixels16_altivec;
c->put_no_rnd_pixels_tab[1][3] = put_no_rnd_pixels8_xy2_altivec;
c->put_no_rnd_pixels_tab[0][3] = put_no_rnd_pixels16_xy2_altivec;
#endif /* HAVE_ALTIVEC */
}
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