The prototypes for Streaming SIMD Extensions 2 (SSE2) intrinsics are in the emmintrin.h header file.
| Intrinsic Name | Operation | Corresponding SSE2 Instruction |
|---|---|---|
| _mm_stream_pd | Store | MOVNTPD |
| _mm_stream_si128 | Store | MOVNTDQ |
| _mm_stream_si32 | Store | MOVNTI |
| _mm_clflush | Flush | CLFLUSH |
| _mm_lfence | Guarantee visibility | LFENCE |
| _mm_mfence | Guarantee visibility | MFENCE |
void _mm_stream_pd(double *p, __m128d a)
Stores the data in a to the
address p without polluting caches. The address
p must be 16-byte aligned. If the cache line containing
address p is already in the cache, the cache will
be updated.
p[0] := a0
p[1] := a1
| p[0] | p[1] |
|---|---|
| a0 | a1 |
void _mm_stream_si128(__m128i *p, __m128i a)
Stores the data in a to the address p without polluting the caches. If the cache line containing address p is already in the cache, the cache will be updated. Address p must be 16-byte aligned.
| *p |
|---|
| a |
void _mm_stream_si32(int *p, int a)
Stores the data in a to the address p without polluting the caches. If the cache line containing address p is already in the cache, the cache will be updated.
| *p |
|---|
| a |
void _mm_clflush(void const*p)
Cache line containing p is flushed and invalidated from all caches in the coherency domain.
void _mm_lfence(void)
Guarantees that every load instruction that precedes, in program order, the load fence instruction is globally visible before any load instruction which follows the fence in program order.
void _mm_mfence(void)
Guarantees that every memory access that precedes, in program order, the memory fence instruction is globally visible before any memory instruction which follows the fence in program order.