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[common] rects: fix avx implementation for unaligned accesses

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Geoffrey McRae 2023-11-19 17:15:44 +11:00
parent 4911e129f8
commit 660b4b8ec8
1 changed files with 15 additions and 9 deletions
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24
common/src/rects.c
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@ -328,29 +328,35 @@ static void rectCopyUnaligned_avx(
src += ystart * srcPitch + dx;
dst += ystart * dstPitch + dx;
const int nvec = width / sizeof(__m256i);
const int rem = width % sizeof(__m256i);
const int nvec = width / sizeof(__m256i);
const int rem = width % sizeof(__m256i);
const int align = (uintptr_t)dst & 31;
for (int i = ystart; i < yend; ++i)
{
const __m256i *restrict s = (__m256i*)src;
__m256i *restrict d = (__m256i*)dst;
// copy the unaligned bytes
for(int col = align; col > 0; --col)
dst[col] = src[col];
const __m256i *restrict s = (__m256i*)(src + align);
__m256i *restrict d = (__m256i*)ALIGN_TO((uintptr_t)dst, 32);
int vec;
for(vec = nvec; vec > 3; vec -= 4)
{
_mm256_stream_si256(d + 0, _mm256_load_si256(s + 0));
_mm256_stream_si256(d + 1, _mm256_load_si256(s + 1));
_mm256_stream_si256(d + 2, _mm256_load_si256(s + 2));
_mm256_stream_si256(d + 3, _mm256_load_si256(s + 3));
_mm256_stream_si256(d + 0, _mm256_loadu_si256(s + 0));
_mm256_stream_si256(d + 1, _mm256_loadu_si256(s + 1));
_mm256_stream_si256(d + 2, _mm256_loadu_si256(s + 2));
_mm256_stream_si256(d + 3, _mm256_loadu_si256(s + 3));
s += 4;
d += 4;
}
for(; vec > 0; --vec, ++d, ++s)
_mm256_stream_si256(d, _mm256_load_si256(s));
_mm256_stream_si256(d, _mm256_loadu_si256(s));
// copy any remaining bytes
for(int col = width - rem; col < width; ++col)
dst[col] = src[col];