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MOVDDUP
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MOVDDUP : ウィキペディア英語版
MOVDDUP
In the x86 assembly programming language, MOVDDUP is the name for a specific action performable by modern x86 processors with 3rd-generation Streaming SIMD Extensions (SSE3). This action involves copying a number to temporary space in the processor for use in other computations.
Specifically, MOVDDUP causes one, double-precision, floating-point source to be copied to both the lower half and upper half of an XMM register.
==Usage==

The source operand can be either an XMM register (''xmm2'') or a memory address (''m64''). When the source operand is an XMM register, the lower half of the register is used in the operation. When the source operand is a memory address, it is assumed to be the address of an 8-byte region, the value at which is used in the operation.
The destination operand must be an XMM register (''xmm1'').

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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