[PATCH] D120461: [RISCV] Custom lower integer vector multify reduction

[Jianjian Guan via Phabricator via llvm-commits]

jacquesguan created this revision.
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Now, we will expand vecreduce_mul to several vector_shuffle and mul. But
it always computes with the whole vl which is not necessary. This patch
will use the active element as the vl to avoid redundant calculation.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D120461

Files:
  llvm/lib/Target/RISCV/RISCVISelLowering.cpp
  llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
  llvm/test/CodeGen/RISCV/rvv/fixed-vectors-reduction-int.ll

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