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X86-64 Instruction Encoding: Difference between revisions
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→VEX/XOP opcodes
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* the instruction has only its VEX/XOP opcode and no legacy opcode; or
* 256-bit YMM registers are used; or
* more than three operands are used (e.g. ''nondestructive-source operations''); or
* when using 128-bit XMM destination registers, bits 128-255 of the corresponding YMM register must be cleared.
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