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This repository has been archived by the owner on Feb 29, 2024. It is now read-only.
very common construct in peripheral/IO bound uC code
Normally the status bit needs to be extracted by
andi
orbexti
followed bybeqz
/bnez
we could fuse the bexti + branch at quite low decoding cost
beqi
/bnei
as well asbexti
only downsides are that the BRANCH major op can't fit another 2 branch instructions, and encoding is problematic on RV64.
On RV32E with peripherals mapped to upper GPRs we gain something like AVR8 SBIS/SBIC instruction
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