Hi,

These instructions looks to be part of the T-head vendor extension instruction set. With the spec here https://github.com/T-head-Semi/thead-extension-spec. 

Best regards
Alex

> On Jan 23, 2024, at 8:42 AM, jacob navia via Gcc <gcc@gcc.gnu.org> wrote:
> 
> Hi
> The GNU assembler supports two instructions for the T-Head risk machines called:
> 
> th.ipop
> th.ipush
> 
> With no arguments. These instructions (they are no macros or aliases) are UNDOCUMENTED in the T-Head instruction manuals that I have, and a google search yields absolutely nothing.
> 
> Can anyone here point me to some documentation that describes what these instructions do?
> 
> Thanks in advance.