Re: [PATCH] MIPS: Make the CODE10 operand code consistent between ISAs

[Richard Sandiford <rdsandiford at googlemail dot com>]

"Maciej W. Rozycki" <macro@codesourcery.com> writes:
> Hi,
>
>  This was perhaps more important with the old code that had to handle 
> separate standard MIPS and microMIPS variants of operands explicitly with 
> macros, but even now I think it makes sense to keep alphanumerical codes 
> consistent between the two instruction sets, to make it a bit easier to 
> the reader.
>
>  This change therefore moves the microMIPS 10-bit immediate code embedded 
> at bits 25..16 in the SYSCALL, WAIT, SDBBP and HYPCALL instructions from 
> `B' over to `+J' which is the operand code used in the standard MIPS 
> instructions set for the same instruction field, used by HYPCALL only in 
> that set.

Well, it seems like matching by purpose vs. matching by field position.
E.g. "s"/RS is in a different position for microMIPS vs. MIPS, so if we
were going to apply that logic consistently, the microMIPS RS fields
would use "t"/RT instead.

But I suppose I don't mind either way, so if you feel strongly about it,
the patch is OK.

Thanks,
Richard