MOVHPD
In the x86 assembly programming language, MOVHPD is the name for a specific action performable by modern x86 processors with 2nd-generation Streaming SIMD Extensions (SSE2). This action involves either copying a number from memory to temporary space or copying a number from temporary space to memory.
Specifically, MOVHPD causes the value at an 8-byte memory region to be either copied to or assigned from the upper half of an XMM register.
Usage
| class="wikitable" |
| Opcode
! Assembly (Intel syntax) ! Assembly (AT&T syntax) ! {{mono|icc}} intrinsic equivalent(s) ! {{mono|gcc}} built-in(s) |
|---|
66 0F 16 /r
| | | | |
66 0F 17 /r
| | | | |
The source operand can be either an XMM register (xmm) or a memory address (m64). When the source operand is an XMM register, the destination operand must be a memory address. When the source operand is a memory address, the destination operand must be an XMM register.
Note that the lower half of the XMM register is unaffected by this operation.
Potential exceptions
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References
- {{mono|gcc}} {{mono|info}} page.
- Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, November, 2006.