[all-commits] [llvm/llvm-project] 064490: [RISCV] Avoid using x7/t2 for indirect branches wh...

[Yeting Kuo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 06449095c22097508854c00f06d27bdccf1ed667
      https://github.com/llvm/llvm-project/commit/06449095c22097508854c00f06d27bdccf1ed667
  Author: Yeting Kuo <46629943+yetingk at users.noreply.github.com>
  Date:   2024-05-02 (Thu, 02 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/GISel/RISCVRegisterBankInfo.cpp
    M llvm/lib/Target/RISCV/RISCVFeatures.td
    M llvm/lib/Target/RISCV/RISCVInstrInfo.td
    M llvm/lib/Target/RISCV/RISCVRegisterInfo.td
    A llvm/test/CodeGen/RISCV/zicfilp-indirect-branch.ll

  Log Message:
  -----------
  [RISCV] Avoid using x7/t2 for indirect branches which need landing pad. (#68292)

When Zicfilp enabled, this avoids selecting indirect jumps to PseudoBRIND/PseudoCALLIndirect/PseudoTAILIndirect, since they may uses X7 as rs1 and be identified as a software guarded jump. There is an another PR #66762 to use software guarded jump for jumptable branch.



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