[all-commits] [llvm/llvm-project] b832c4: [RISCV] Fix VLOptimizer assert, relax ElementsDepe...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b832c49cb4d7668e6ab49c984ba3f4c56356f023
      https://github.com/llvm/llvm-project/commit/b832c49cb4d7668e6ab49c984ba3f4c56356f023
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-07-21 (Mon, 21 Jul 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrFormats.td
    M llvm/lib/Target/RISCV/RISCVInstrInfoV.td
    M llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp

  Log Message:
  -----------
  [RISCV] Fix VLOptimizer assert, relax ElementsDependOn on viota/vms{b,i,o}f.m (#149698)

The previous assert wasn't passing the TSFlags but the opcode, so wasn't
working.

Fixing it reveals that it was actually triggering, because we're too
strict with viota and vmsxf.m We already reduce the VL on these
instructions because the result in each element doesn't depend on VL.
However, it does change if masked, so account for that.



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