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.
|Opcode||Assembly (Intel syntax)||Assembly (AT&T syntax)||icc intrinsic equivalent(s)||gcc built-in(s)|
|66 0F 16 /r||MOVHPD xmm, m64||MOVHPD m64, xmm||
|66 0F 17 /r||MOVHPD m64, xmm||MOVHPD xmm, m64||
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.
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- gcc info page.
- Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, November, 2006.