[Libre-soc-isa] [Bug 533] design new CR instructions suitable for predication

bugzilla-daemon at libre-soc.org bugzilla-daemon at libre-soc.org
Wed Mar 23 15:41:52 GMT 2022


--- Comment #11 from Jacob Lifshay <programmerjake at gmail.com> ---
(In reply to Luke Kenneth Casson Leighton from comment #10)
> in order to match with the pmovmaskb concept i'm recommending that
> sv.crweird and sv.crweirder be even less consistent with the usual
> SV conformity/paradigm and allow the elwidth to specify that 1, 2, 4 or 8

do note that pmovmaskb actually copies 16 or 32 bits of MSBs to an integer
register, rather than 1, 2, 4, or 8. (pmovmaskb technically has a version that
does 8-bits, but nobody uses that anymore since the source is a MMX register --
shared with x87 registers in a painful manner)

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