Below are two ARM links about the PACGA instruction. I cannot find anywhere information about how to authenticate the returned PACGA code. What instruction is used for authenticating PACGA??? For PACIA, authentication is done with AUTIA. For PACIB, authentication is done with AUTIB. But I cannot find a description of AUTGA anywhere.

https://developer.arm.com/documentation/dui0801/g/fbm1476202745161

https://developer.arm.com/documentation/ddi0602/2024-03/Base-Instructions/PACGA–Pointer-Authentication-Code–using-Generic-key-

I have looked all over the internet and ARM resources and cannot find anything.