movapd

MOVAPD is an instruction in the x86 instruction set architecture, specifically part of the Streaming SIMD Extensions 2 (SSE2) and Advanced Vector Extensions (AVX) instruction sets. It stands for "Move Aligned Packed Double-Precision Floating-Point Values." This instruction is used to move or copy 128 bits of packed double-precision floating-point values from the source operand to the destination operand. The source operand can be a memory location or another XMM register, while the destination operand is always an XMM register.

The MOVAPD instruction requires that the data being moved is aligned on a 16-byte boundary. If the data is not aligned, the instruction will generate a general protection fault. This alignment requirement is to ensure optimal performance and to prevent potential data corruption.

MOVAPD is often used in performance-critical applications, such as scientific computing, multimedia processing, and real-time systems, where efficient data movement is crucial. It is also commonly used in conjunction with other SSE2 and AVX instructions to perform complex vector operations.

In summary, MOVAPD is a fundamental instruction in the x86 architecture for moving packed double-precision floating-point values between memory and XMM registers, with a requirement for 16-byte alignment to ensure optimal performance and data integrity.