[Libre-soc-isa] [Bug 615] talk to binutils and gcc developers about acceptable sv assembly format

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Mar 16 12:43:57 GMT 2021


--- Comment #15 from Luke Kenneth Casson Leighton <lkcl at lkcl.net> ---
(In reply to Jacob Lifshay from comment #14)

> > have gcc create the svp64 prefix as a new 32 bit "fake" instruction which
> > binutils picks up and outputs with an EXT01 Primary Opcode.
> That could definitely work -- Arm does something kinda like that with their
> Thumb-mode IT instruction which sets up a predicate to conditionally execute
> the next 1-4 instructions.

ahh iiinteresting! there is a keyword "parallel" in the macro language which
associates groups of other macros, typically predicates.

cntlz simple pattern


there are attributes "predicable" and "multiple"


then... urk.  i started looking through the arm11 md file, no joy finding
anything obvious.

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