[Libre-soc-bugs] [Bug 755] add grev instruction (OP_GREV)

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Fri Jan 14 22:53:36 GMT 2022


--- Comment #22 from Jacob Lifshay <programmerjake at gmail.com> ---
adding pseudo-code...I decided grevw should be defined to leave the MSB word
cleared -- specifically zero-extending because that allows the compiler to skip
zero-extension instructions that could otherwise be needed. I picked
zero-extension rather than sign-extension because that doesn't require copying
the sign bit, potentially saving wiring.

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