Re: [PATCH] RISC-V: Add the Zihpm and Zicntr extensions

[Jeff Law <jeffreyalaw@gmail.com>]

On 11/8/22 20:00, Palmer Dabbelt wrote:
> These extensions were recently frozen [1].  As per Andrew's post [2]
> we're meant to ignore these in software, this just adds them to the list
> of allowed extensions and otherwise ignores them.  I added these under
> SPEC_CLASS_NONE even though the PDF lists them as 20190614 because it
> seems pointless to add another spec class just to accept two extensions
> we then ignore.
>
> 1: https://groups.google.com/a/groups.riscv.org/g/isa-dev/c/HZGoqP1eyps/m/GTNKRLJoAQAJ
> 2: https://groups.google.com/a/groups.riscv.org/g/sw-dev/c/QKjQhChrq9Q/m/7gqdkctgAgAJ
>
> gcc/ChangeLog
>
> 	* common/config/riscv/riscv-common.cc: Add Zihpm and Zicnttr
> 	extensions.

So the idea here is just to define the extension so that it gets defined 
in the ISA strings and passed through to the assembler, right?

Jeff