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rfid and hrfid — Store Halfword Byte-Reverse Indexed
https://sthbrx.github.io/blog/2019/12/18/rfid-and-hrfid/
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openpower
instruction set architecture
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I was staring at some assembly recently, and for not the first time encountered rfid and hrfid, two instructions that we use when doing things like returning to userspace, returning from OPAL to the kernel, or from a host kernel into a guest.
