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[common] rects: fix unaligned avx memcpy implementation

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This commit is contained in:
Geoffrey McRae
2026-07-30 14:28:40 +10:00
parent f5dee45adc
commit 8828e640ab
1 changed files with 15 additions and 4 deletions
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19
common/src/rects.c
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@@ -330,12 +330,20 @@ static void rectCopyUnaligned_avx(
src += ystart * srcPitch + dx;
dst += ystart * dstPitch + dx;
const int align = (32 - ((uintptr_t)dst & 31)) & 31;
const int nvec = (width - align) / sizeof(__m256i);
const int rem = (width - align) % sizeof(__m256i);
bool streamed = false;
for (int i = ystart; i < yend; ++i)
{
/*
* dstPitch is not necessarily a multiple of the AVX store alignment.
* Recalculate the prefix for every row so the streaming stores remain
* aligned for packed 24-bit and odd-width framebuffers.
*/
const int rowAlign = (32 - ((uintptr_t)dst & 31)) & 31;
const int align = min(rowAlign, width);
const int nvec = (width - align) / sizeof(__m256i);
const int rem = (width - align) % sizeof(__m256i);
streamed |= nvec > 0;
// copy the unaligned bytes
for(int col = align - 1; col >= 0; --col)
dst[col] = src[col];
@@ -365,6 +373,9 @@ static void rectCopyUnaligned_avx(
src += srcPitch;
dst += dstPitch;
}
if (streamed)
_mm_sfence();
}
#ifdef __clang__
#pragma clang attribute pop