[all-commits] [llvm/llvm-project] 63b534: [RISCV] Fold vmv.x.s into load from stack (#109774)

[Luke Lau via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 63b534be1765391d102464d26208eef3510fd62d
      https://github.com/llvm/llvm-project/commit/63b534be1765391d102464d26208eef3510fd62d
  Author: Luke Lau <luke at igalia.com>
  Date:   2024-09-25 (Wed, 25 Sep 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVInstrInfo.cpp
    A llvm/test/CodeGen/RISCV/rvv/stack-folding.ll

  Log Message:
  -----------
  [RISCV] Fold vmv.x.s into load from stack (#109774)

If a vector is reloaded from the stack to be used in vmv.x.s, we can
tell foldMemoryOperandImpl to fold it into a scalar load.

If XLEN < SEW then this currently just bails. I couldn't think of a way
to express a vmv.x.s that truncates in LLVM IR.



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