tree aad71b725de4a1fc9728a2fa9566aff08e5607fa
parent d9cfd905248a7ef74826576978348600a372af5f
author Philip Reames <preames@rivosinc.com> 1744277344 -0700
committer GitHub <noreply@github.com> 1744277344 -0700
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[RISCV] Recognize a zipeven/zipodd requiring larger SEW (#134923)

This is a follow up to f8ee58a3c, and improves code generation for the
XRivosVizip extension.

If we have a slide pair which could be a zipeven or zipodd if the
shuffle was widened, widen the shuffle and then mask the zipeven or
zipodd.

This is basically working around an order of matching issue; we match
the slide pair variants before trying widening. I considered whether we
should just widen slide pairs without any consideration of the zip
idioms, but the resulting codegen changes look mostly like churn, and
have no clear evidence of profitability.