On Tue, Jul 14, 2020 at 12:41 AM Richard Henderson <
[email protected]> wrote:
> On 7/12/20 7:02 PM, Frank Chang wrote:
> > Does decodetree support any feature for multi-version opcodes?
> > Or if it can use something like C macros to compile with the opcodes by
> the vspec
> > user assigned? If there's any good way to keep both versions, then I can
> try to
> > rearrange
> > my codes to support both vspecs.
>
> There is a way, using { } to indicate where overlap is allowed. The
> trans_*
> functions checks the ISA version, and return false. Which causes the next
> matching overlapping pattern to be used, etc. Have a look at some of the
> ARM
> decodetree files.
>
> But since Alisair is happy dropping 0.7.1 support, we should do that. It
> will
> be cleaner not to have to retain the backward compatibility.
>
>
> r~
>
That makes sense to me.
Thanks to Alisair and Richard's feedback.
Frank Chang
