On Wed, Dec 4, 2019 at 3:33 AM commits@source.squeak.org wrote:
ARMv8 has an amazingly exotic scheme for encoding bitfields as immediates in logical operations. Copy LLVM's encoder. So far this is unverified because I cannot make sense of immN:NOT(imms) in len = HighestSetBit(immN:NOT(imms)); in DecodeBitMasks on page J1-7389 of the Arm ARM. If you can make sense of this either consider fully implementing CogARMv8Compiler>>decodeBitMasksN:imms:immr: or explaining to me what is meant by "immN:NOT(imms)" (via email to OpenSMalltalk-VM ?).
AdvThanksance.
Is line 91 of https://github.com/NationalSecurityAgency/ghidra/blob/master/Ghidra/Processo... of any use?
Basically, : -> concatenate bit fields NOT -> ... not ;)
Cheers, Henry