tree 3800842d392f83a858047153d16ba029c1f7094b
parent c432936b05d9e47c23dbbbe00ba02e11384fe6ff
author Philip Reames <preames@rivosinc.com> 1747927745 -0700
committer GitHub <noreply@github.com> 1747927745 -0700
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[RISCV] Lower PARTIAL_REDUCE_[S/U]MLA via zvqdotq (#140950)

The semantics of the PARTIAL_REDUCE_SMLA with i32 result element, and i8
sources corresponds to vqdot. Analogously PARTIAL_REDUCE_UMLA
corresponds to vqdotu. There is currently no vqdotsu equivalent.

This patch is a starting place. We can extend this quite a bit more, and
I plan to take a look at the fixed vector lowering, the TTI hook to
drive loop vectorizer, and to try to integrate the reduction based
lowering I'd added for zvqdotq into this flow.