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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. Note how Clang's integrated assembler doesn't even support CMPSD as a string instruction - that's imo yet more odd behavior, and likely attributed _solely_ to the goal of wanting to work around code wrongly using such. Jan