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Fixed bug with unaligned input on VSX filter_up

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This commit is contained in:
Vadim Barkov 2017-01-16 19:45:17 +03:00
parent 91acd4baf8
commit ccef5edbfe
1 changed files with 24 additions and 29 deletions
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49
powerpc/filter_vsx_intrinsics.c
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@ -36,26 +36,37 @@ void png_read_filter_row_up_vsx(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
png_size_t i;
png_size_t istop = row_info->rowbytes;
png_size_t unaligned_top = (png_size_t)row % 16;
png_size_t istop = row_info->rowbytes - unaligned_top;
png_bytep rp = row;
png_const_bytep pp = prev_row;
vector unsigned char rp_vec;
vector unsigned char pp_vec;
/* Altivec operations require 16-byte aligned data
* but input can be unaligned. So we calculate
* unaligned part as usual.
*/
for (i = 0; i < unaligned_top; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
/* Using SIMD while we can */
while( istop >= 16 )
{
rp_vec = vec_ld(0,rp);
pp_vec = vec_ld(0,pp);
rp_vec = vec_ld(0,rp);
pp_vec = vec_ld(0,pp);
rp_vec = vec_add(rp_vec,pp_vec);
rp_vec = vec_add(rp_vec,pp_vec);
vec_st(rp_vec,0,rp);
vec_st(rp_vec,0,rp);
pp += 16;
rp += 16;
istop -= 16;
pp += 16;
rp += 16;
istop -= 16;
}
if(istop % 16 > 0)
@ -68,10 +79,11 @@ void png_read_filter_row_up_vsx(png_row_infop row_info, png_bytep row,
*rp = (png_byte)(((int)(*rp) + (int)(*pp++)) & 0xff);
rp++;
}
}
}
void png_read_filter_row_sub4_vsx(png_row_infop row_info, png_bytep row,
}
void png_read_filter_row_sub_vsx(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
const unsigned int bpp = 4;
@ -88,23 +100,6 @@ void png_read_filter_row_sub4_vsx(png_row_infop row_info, png_bytep row,
}
}
void png_read_filter_row_sub3_vsx(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{
const unsigned int bpp = 4;
png_size_t i;
png_size_t istop = row_info->rowbytes;
png_bytep rp = row + bpp;
PNG_UNUSED(prev_row)
for (i = bpp; i < istop; i++)
{
*rp = (png_byte)(((int)(*rp) + (int)(*(rp-3))) & 0xff);
rp++;
}
}
void png_read_filter_row_avg4_vsx(png_row_infop row_info, png_bytep row,
png_const_bytep prev_row)
{