Messages in this thread | | | From | (H. Peter Anvin) | Subject | Re: [PATCH] Removes x86 warning messages | Date | 28 Oct 1999 16:24:57 GMT |
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Followup to: <Pine.LNX.3.95.991028082803.6412A-100000@chaos.analogic.com> By author: "Richard B. Johnson" <root@chaos.analogic.com> In newsgroup: linux.dev.kernel > > It is perfectly correct to move a longword to a segment register. This > removes the generation of the 0x66 prefix which is more code which > has to be fetched, slowing down execution. >
Actually, it's not. It's just that gas improperly thinks there is a distinction. I consider this to be a gas bug.
movw %ax,%es
... should be the *only* legal form, and it should *never* generate a prefix.
-hpa -- <hpa@transmeta.com> at work, <hpa@zytor.com> in private!
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