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[PATCH 3/6] x86: improve operand reversal

Jan Beulich JBeulich@suse.com
Fri Aug 3 07:08:00 GMT 2018 
>>> On 02.08.18 at 18:43, <hjl.tools@gmail.com> wrote:
> Please don't make any changes to the deprecated ".s".

Excuse me, but how many more times should I state that I don't
make any changes to its behavior? I solely make {store} no longer
match .s in behavior. In fact I've specifically undone the change
to .s, in anticipation of your objection to any adjustment to it.

And btw - it's nice to have all these pseudo prefixes, if only they
had actually worked half way correctly from the very beginning.
And I'm already leaving aside the case of the indeed non-trivial
situation with {,v}movq, where there are two load and two store
encodings available in 64-bit mode (when there's a memory
operand). I would expect to be able to control this as a
programmer, but I have no good idea on how to make this work.

Furthermore, and I'm sorry to say that, but something like
{disp32} was ill-advised altogether (just like the now deprecated
.d32): It's at best confusing for 16-bit addressing. This should
have been e.g. {dispw}. But that ship has sailed now.

Additionally - if .s is deprecated, why does the disassembler
continue to emit it?

Jan
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