Partial write %PSR (WRPSR) is a SPARC V8e option that allows WRPSR instructions to only affect the %PSR.ET field. It is supported by the GR740.
The instruction mnemonic "pwr" is invented here, I guess? I don't see that ever having been used elsewhere (e.g., binutils as doesn't support this yet?)
Seems okay, but just want to make sure we're not causing a compatibility issue.
Yes, the SPARC V8e manual did not provide a mnemonic for it so it is invented here. I have submitted a similar patch to binutils so I will hold this patch until the other one gets approved, in case someone wants me to change the name.