[all-commits] [llvm/llvm-project] c58011: [RISCV][VLOPT] Peek through copies in checkUsers (...

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: c58011dc65719c4207c2e641a6e32af1c60cdbe8
      https://github.com/llvm/llvm-project/commit/c58011dc65719c4207c2e641a6e32af1c60cdbe8
  Author: Luke Lau <luke at igalia.com>
  Date:   2025-02-20 (Thu, 20 Feb 2025)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVVLOptimizer.cpp
    M llvm/test/CodeGen/RISCV/rvv/rvv-peephole-vmerge-vops.ll
    M llvm/test/CodeGen/RISCV/rvv/vl-opt.ll
    M llvm/test/CodeGen/RISCV/rvv/vl-opt.mir

  Log Message:
  -----------
  [RISCV][VLOPT] Peek through copies in checkUsers (#127656)

Currently if a user of an instruction isn't a vector pseudo we bail. For
simple non-subreg virtual COPYs, we can peek through their uses by using
a worklist.

This is extracted from a loop in TSVC2 (s273) that contains a fcmp +
select, which produces a copy that doesn't seem to be coalesced away.



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