In the x86 assembly programming language, MOVAPD is the name for a specific action performable by modern x86 processors with 2nd-generation Streaming SIMD Extensions (SSE2). This action involves copying a pair of numbers to temporary space in the processor for use in other computations. MOVAPD is one of the fastest ways to accomplish this effect.
|Opcode||Assembly (Intel syntax)||Assembly (AT&T syntax)||icc intrinsic equivalent(s)||gcc built-in(s)|
|66 0F 28 /r||MOVAPD xmm1, xmm2/m128||MOVAPD xmm2/m128, xmm1||
|66 0F 29 /r||MOVAPD xmm1/m128, xmm2||MOVAPD xmm2, xmm1/m128||
The source operand can be either an XMM register (xmm2) or a memory address (m128).
The destination operand can be either an XMM register (xmm1) or a memory address (m128). Note, however, that the source and destination operands cannot both be memory addresses.
If a memory address operand is not 16-byte-aligned, a general protection exception (#GP) will be raised. This can cause strange interoperability bugs when ordinary code calls an external code that was compiled with the assumption of a 16-byte-aligned stack frame boundary.
- gcc info page.
- Intel 64 and IA-32 Architectures Optimization Reference Manual, November, 2006.
- Intel 64 and IA-32 Architectures Software Developer's Manual Volume 2A: Instruction Set Reference, A-M, November, 2006.
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