모두의 코드
MOVNTQ (Intel x86/64 assembly instruction)
MOVNTQ
Store of Quadword Using Non-Temporal Hint
참고 사항
아래 표를 해석하는 방법은 x86-64 명령어 레퍼런스 읽는 법 글을 참조하시기 바랍니다.
Opcode | Instruction | Op/ | 64-Bit | Compat/ | Description |
|---|---|---|---|---|---|
0F E7 /r | MOVNTQ m64 mm | MR | Valid | Valid | Move quadword from mm to m64 using non-temporal hint. |
Instruction Operand Encoding
Op/En | Operand 1 | Operand 2 | Operand 3 | Operand 4 |
|---|---|---|---|---|
MR | ModRM:r/m (w) | ModRM:reg (r) | NA | NA |
Description
Moves the quadword in the source operand (second operand) to the destination operand (first operand) using a non-temporal hint to minimize cache pollution during the write to memory. The source operand is an MMX tech-nology register, which is assumed to contain packed integer data (packed bytes, words, or doublewords). The destination operand is a 64-bit memory location.
The non-temporal hint is implemented by using a write combining (WC) memory type protocol when writing the data to memory. Using this protocol, the processor does not write the data into the cache hierarchy, nor does it fetch the corresponding cache line from memory into the cache hierarchy. The memory type of the region being written to can override the non-temporal hint, if the memory address specified for the non-temporal store is in an uncacheable (UC) or write protected (WP) memory region. For more information on non-temporal stores, see "Caching of Temporal vs. Non-Temporal Data" in Chapter 10 in the Intel(R) 64 and IA-32 Architectures Software Developer's Manual, Volume 1.
Because the WC protocol uses a weakly-ordered memory consistency model, a fencing operation implemented with the SFENCE or MFENCE instruction should be used in conjunction with MOVNTQ instructions if multiple processors might use different memory types to read/write the destination memory locations.
This instruction's operation is the same in non-64-bit modes and 64-bit mode.
Operation
DEST <- SRC;
Intel C/C++ Compiler Intrinsic Equivalent
MOVNTQ : void _mm_stream_pi(__m64* p, __m64 a)
SIMD Floating-Point Exceptions
None.
Other Exceptions
See Table 22-8, "Exception Conditions for Legacy SIMD/MMX Instructions without FP Exception," in the Intel(R) 64 and IA-32 Architectures Software Developer's Manual, Volume 3A.
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