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

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	__m128d _mm_loadh_pd(__m128d a, double *dp)
66 0F 17 /r	MOVHPD m64, xmm	MOVHPD xmm, m64	void _mm_storeh_pd(double *pd, __m128d a)

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.

References

• gcc info page.
• Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, November, 2006.

See also

• MOVAPS/MOVAPD
• MOVDDUP
• MOVHLPS
• MOVHPS/MOVHPD
• MOVLHPS
• MOVLPS/MOVLPD
• MOVMSKPS/MOVMSKPD
• MOVNTPS
• MOVSHDUP
• MOVSLDUP
• MOVSS/MOVSD
• MOVUPS/MOVUPD

x86 instruction listings

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