[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 03:20:05 GMT 2021


--- Comment #14 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #13)
> an idea came up which would remove the need to modify gcc's rs6000.md opcode
> mnemonic generators significantly or even at all:
> 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.

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