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Lu wrote: > Does the new assembler work on Linux kernel which has "rep movsd"? No. And it shouldn't, as they should never have used MOVSD. The only valid mnemonic (in AT&T syntax) is MOVSL. If you're meaning to suggest that we continue to support MOVSD in AT&T mode, then this will - once again for consistency - need extending to _all_ other D-suffixable insns the SDM specifies. I can only repeat what I've said before: Consistency is a requirement such that users can predict assembler behavior. In the meantime I guess I'll make a patch for Linux. Jan