[all-commits] [llvm/llvm-project] 1306a7: [RISCV] Fix scalable expandload lowering for i8 ty...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 1306a7839d3eb573ff155fea66ee13e97cabf814
      https://github.com/llvm/llvm-project/commit/1306a7839d3eb573ff155fea66ee13e97cabf814
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/rvv/compressstore.ll
    M llvm/test/CodeGen/RISCV/rvv/expandload.ll

  Log Message:
  -----------
  [RISCV] Fix scalable expandload lowering for i8 types (#225141)

This PR adds tests for scalable expandload/compressstore intrinsics, and
also fixes a crash where we tried to query getVectorNumElements on a
scalable vector for i8 element types.

We need to use vrgatherei16 when VLMAX may exceed 255, so compute this
for scalable vectors based off of getRealMaxVLen.

This is in preparation for compress pattern vectorization support in
https://github.com/llvm/llvm-project/pull/214491


  Commit: 7bcd6b42a9250baab46ad735d0c4bb4d43e74c37
      https://github.com/llvm/llvm-project/commit/7bcd6b42a9250baab46ad735d0c4bb4d43e74c37
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp
    M llvm/test/Analysis/CostModel/RISCV/rvv-expandload-compressstore.ll

  Log Message:
  -----------
  [RISCV] Return cost for scalable compressstore/expandload intrinsics (#225143)

The type based cost still needs fixed.


  Commit: 74c5a6421b6bb260ef09e6d5f941970ae55629ce
      https://github.com/llvm/llvm-project/commit/74c5a6421b6bb260ef09e6d5f941970ae55629ce
  Author: Luke Lau <luke at igalia.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVSubtarget.cpp
    M llvm/lib/Target/RISCV/RISCVSubtarget.h
    M llvm/lib/Target/RISCV/RISCVTargetTransformInfo.cpp

  Log Message:
  -----------
  [RISCV] Remove getMaxLMULForFixedLengthVectors. NFC (#226111)

The value can no longer be overridden after
https://github.com/llvm/llvm-project/pull/207312. Now there's nothing
specific about it to fixed vectors, so just inline it.


Compare: https://github.com/llvm/llvm-project/compare/6bfa1c552ea1...74c5a6421b6b

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