[Libre-soc-isa] [Bug 1090] feedback on OPF SVP64 RFC for "bigint" instructions: ls003.bignum

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Thu May 25 06:56:15 BST 2023


--- Comment #1 from Paul Mackerras <paulus at ozlabs.org> ---
Comments from IBM architects regarding the proposal:

The ls003 FX instructions use RC, aliased as RS, as the second output. I think
the architecture doesn't alias registers thus. And I think RS is never used as
a target.

And for Load with Update instructions (which I think are the only FX
instructions that currently have two outputs) the second output register is RA.
And, for existing instructions that use RS, RS is in bits 6:10, not bits 21:25
as in ls003.

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