Well, the pdf I have dates from 2022, but it hasn’t any reference to those instructions. But that link works, THANKS A LOT! I will now use that documentation. Jacob P.S. I am going through EACH one of the instructions in the instruction table, and documenting what it does, syntax, abstract arguments and mode of operation. > Le 23 janv. 2024 à 15:16, Alex Huang a écrit : > > 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 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.