[all-commits] [llvm/llvm-project] 9fb196: [RISCV] Insert simple landing pad for taken addres...

[Yeting Kuo via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9fb196b469c9cdc5f44c0621b44289137cdd654a
      https://github.com/llvm/llvm-project/commit/9fb196b469c9cdc5f44c0621b44289137cdd654a
  Author: Yeting Kuo <46629943+yetingk at users.noreply.github.com>
  Date:   2024-08-06 (Tue, 06 Aug 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/CMakeLists.txt
    M llvm/lib/Target/RISCV/RISCV.h
    A llvm/lib/Target/RISCV/RISCVIndirectBranchTracking.cpp
    M llvm/lib/Target/RISCV/RISCVTargetMachine.cpp
    M llvm/test/CodeGen/RISCV/O0-pipeline.ll
    M llvm/test/CodeGen/RISCV/O3-pipeline.ll
    M llvm/test/CodeGen/RISCV/jumptable-swguarded.ll
    A llvm/test/CodeGen/RISCV/lpad.ll

  Log Message:
  -----------
  [RISCV] Insert simple landing pad for taken address labels. (#91855)

This patch implements simple landing pad labels ([pr]). When Zicfilp
enabled, this patch inserts `lpad 0` at the beginning of basic blocks
which are possible to be landed by indirect jumps.
This patch also supports option riscv-landing-pad-label to make users
cpable to set nonzero fixed labels. Using nonzero fixed label force
setting t2 before indirect jumps. It's less portable but more strict
than original implementation.

[pr]: https://github.com/riscv-non-isa/riscv-elf-psabi-doc/pull/417



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