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SCBNDSI redundancy? #402

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nwf opened this issue Oct 2, 2024 · 0 comments
Open

SCBNDSI redundancy? #402

nwf opened this issue Oct 2, 2024 · 0 comments

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@nwf
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nwf commented Oct 2, 2024

SCBNDSI has a 5-bit immediate, uimm, and a gated (by s) shift-by-4 operation, in

riscv-cheri/src/insns/scbnds_32bit.adoc

Line 43 in 1c43ce2

`immediate = ZeroExtend(s ? uimm<<4 : uimm)`
which means that there are two ways to request bound lengths of 0 (unshifed or shifted 0) and 16 (unshifed 16, shifted 1). Perhaps "shifted 0" and "shifted 1" could be put to better use (as requests for 512 and 528, say)?
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