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Setting MMX and SSE registrys

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I've got a question about these extensions. There are many instructions for SSE and MMX but I can't find a way to load a 64 bit number directly into a register. I know only how to load a number from memory into a registry. Can someybody help me? I'm using 32 bit mode. Thank you in advance for any help.

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I don't think it's possible to move an immediate into the mm registers. The way you can with normal registers (mov eax, 0x12345678).

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