[all-commits] [llvm/llvm-project] cb5445: [RISCV] Lower masked_{u, s}{div, rem} and update TTI...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: cb5445f0797b01fee6410319df09813bfc8021f6
      https://github.com/llvm/llvm-project/commit/cb5445f0797b01fee6410319df09813bfc8021f6
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-04-17 (Fri, 17 Apr 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVInstrInfoVSDPatterns.td
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/masked-divrem.ll
    M llvm/test/CodeGen/RISCV/rvv/masked-sdiv.ll
    M llvm/test/CodeGen/RISCV/rvv/masked-srem.ll
    M llvm/test/CodeGen/RISCV/rvv/masked-udiv.ll
    M llvm/test/CodeGen/RISCV/rvv/masked-urem.ll

  Log Message:
  -----------
  [RISCV] Lower masked_{u,s}{div,rem} and update TTI (#192543)

The loop vectorizer will soon emit llvm.masked.udiv intrinsics and
friends. The vast majority of the time these will be transformed to
vp.udiv on RISC-V thanks to tail folding, but if it doesn't tail fold or
uses a fixed VF then it will reach instruction selection.

This patch lowers the nodes to the masked pseudo for scalable and fixed
vectors, and updates the TTI to account for it.



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