[Vm-dev] VM Maker: VMMaker.oscog-eem.2602.mcz

Henrik Sperre Johansen henrik.s.johansen at veloxit.no
Thu Dec 5 12:37:57 UTC 2019

On Wed, Dec 4, 2019 at 3:33 AM <commits at 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
of any use?

: -> concatenate bit fields
NOT -> ... not ;)

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