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[common] corrected memcpySSE overflow error

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This commit is contained in:
Geoffrey McRae 2017-11-28 12:49:29 +11:00
parent 6c9269b64f
commit 2da40012ca
1 changed files with 39 additions and 13 deletions
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52
common/memcpySSE.h
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@ -68,22 +68,25 @@ static inline void memcpySSE(void * dst, const void * src, size_t length)
__m128i * _src = (__m128i *)src;
__m128i * _dst = (__m128i *)dst;
__m128i * _end = (__m128i *)src + (length / 16);
__m128i v0, v1, v2, v3, v4, v5, v6, v7;
const size_t sselen = length & ~0x7F;
const __m128i * _end = (__m128i *)((uintptr_t)src + sselen);
for (; _src != _end; _src += 8, _dst += 8)
{
_mm_prefetch(((char *)_src + 8 ), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 9 ), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 10), _MM_HINT_NTA);
_mm_prefetch(((char *)_src + 11), _MM_HINT_NTA);
_mm_prefetch(((char *)(_src + 8 )), _MM_HINT_NTA);
_mm_prefetch(((char *)(_src + 9 )), _MM_HINT_NTA);
_mm_prefetch(((char *)(_src + 10)), _MM_HINT_NTA);
_mm_prefetch(((char *)(_src + 11)), _MM_HINT_NTA);
__m128i v0 = _mm_load_si128(_src + 0);
__m128i v1 = _mm_load_si128(_src + 1);
__m128i v2 = _mm_load_si128(_src + 2);
__m128i v3 = _mm_load_si128(_src + 3);
__m128i v4 = _mm_load_si128(_src + 4);
__m128i v5 = _mm_load_si128(_src + 5);
__m128i v6 = _mm_load_si128(_src + 6);
__m128i v7 = _mm_load_si128(_src + 7);
v0 = _mm_load_si128(_src + 0);
v1 = _mm_load_si128(_src + 1);
v2 = _mm_load_si128(_src + 2);
v3 = _mm_load_si128(_src + 3);
v4 = _mm_load_si128(_src + 4);
v5 = _mm_load_si128(_src + 5);
v6 = _mm_load_si128(_src + 6);
v7 = _mm_load_si128(_src + 7);
_mm_stream_si128(_dst + 0, v0);
_mm_stream_si128(_dst + 1, v1);
@ -94,4 +97,27 @@ static inline void memcpySSE(void * dst, const void * src, size_t length)
_mm_stream_si128(_dst + 6, v6);
_mm_stream_si128(_dst + 7, v7);
}
const size_t remain = ((length - sselen) & ~0xF) >> 4;
switch (remain)
{
case 7: v0 = _mm_load_si128(_src++);
case 6: v1 = _mm_load_si128(_src++);
case 5: v2 = _mm_load_si128(_src++);
case 4: v3 = _mm_load_si128(_src++);
case 3: v4 = _mm_load_si128(_src++);
case 2: v5 = _mm_load_si128(_src++);
case 1: v6 = _mm_load_si128(_src++);
}
switch (remain)
{
case 7: _mm_stream_si128(_dst++, v0);
case 6: _mm_stream_si128(_dst++, v1);
case 5: _mm_stream_si128(_dst++, v2);
case 4: _mm_stream_si128(_dst++, v3);
case 3: _mm_stream_si128(_dst++, v4);
case 2: _mm_stream_si128(_dst++, v5);
case 1: _mm_stream_si128(_dst++, v6);
}
}