Messages in this thread | | | Date | Mon, 29 Apr 2019 09:36:25 +0200 | From | Borislav Petkov <> | Subject | Re: [RFC PATCH v5 4/4] x86/acrn: Add hypercall for ACRN guest |
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On Mon, Apr 29, 2019 at 09:24:12AM +0800, Zhao, Yakui wrote: > Yes. "movq" only indicates explicitly that it is 64-bit mov as ACRN guest > only works under 64-bit mode. > I also check the usage of "mov" and "movq" in this scenario. There is no > difference except that the movq is an explicit 64-op.
Damn, I'm tired of explaining this: it is explicit only to the code reader. gcc generates the *same* instruction no matter whether it has a "q" suffix or not as long as the destination register is a 64-bit one.
If you prefer to have it explicit, sure, use "movq".
-- Regards/Gruss, Boris.
Good mailing practices for 400: avoid top-posting and trim the reply.
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