[Libre-soc-isa] [Bug 1092] OPF RFC ISA WG questions feedback on ls002 float-load-immediate

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Tue Jun 20 03:10:09 BST 2023


--- Comment #22 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Paul Mackerras from comment #20)
> My suggestion is to define a "floating load immediate single-precision"
> (flis) instruction which differs from xxspltidp in only one bit in its
> instruction encoding,

> This should add minimal extra work for implementations which have VSX
> already, and it wouldn't use up any PO9 opcode space.

that sounds like a good idea to me! though, one minor issue I have is the lack
of support for subnormal values implied by being based on xxspltidp which
declares subnormals to be UB.

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