Re: [Nasm-devel] NASM bugs / features

[<ri...@rt...>]

Stephen,

> >3.  Instructions for moving a segment register to memory,
> >    e.g. 'mov [mem],es', generate (when in 32-bit mode) a
> >    0x66 prefix when none is necessary.
> 
> Again, instruction_set.pdf shows that this is OK (look under MOV).
> But it's wasting a byte, so it ought to be changed anyway.

Thanks.  Here's another one in a similar vein:

The instruction 'shrd [di],dx,n' generates both a 0x66
prefix and a 0x67 prefix, but only one is required.

Richard.
http://www.rtrussell.co.uk/