tree db4645150f5e45178b451c5c5c06d217716cc75d
parent 63d5e64f1e729613157683a149b9141e80e0b0c9
author Philip Reames <preames@rivosinc.com> 1745593180 -0700
committer GitHub <noreply@github.com> 1745593180 -0700
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[RISCV] Add codegen support for ri.vinsert.v.x and ri.vextract.x.v (#136708)

These instructions are included in XRivosVisni. They perform a scalar
insert into a vector (with a potentially non-zero index) and a scalar
extract from a vector (with a potentially non-zero index) respectively.
They're very analogous to vmv.s.x and vmv.x.s respectively.

The instructions do have a couple restrictions:
1) Only constant indices are supported w/a uimm5 format.
2) There are no FP variants.

One important property of these instructions is that their throughput
and latency are expected to be LMUL independent.