[all-commits] [llvm/llvm-project] d7f2a6: [RISCV] Fold stack reload into sext.w by using lw ...

[Craig Topper via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d7f2a633714471e78684cefea0291fbcdc1c3e14
      https://github.com/llvm/llvm-project/commit/d7f2a633714471e78684cefea0291fbcdc1c3e14
  Author: Craig Topper <craig.topper at sifive.com>
  Date:   2022-07-18 (Mon, 18 Jul 2022)

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

  Log Message:
  -----------
  [RISCV] Fold stack reload into sext.w by using lw instead of ld.

We can use lw to load 4 bytes from the stack and sign extend them
instead of loading all 8 bytes.

Reviewed By: asb

Differential Revision: https://reviews.llvm.org/D129948