[all-commits] [llvm/llvm-project] 41fdb4: [RISCV] Permit tail call to an externally-defined ...

[Liao Chunyu via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 41fdb4c53f44281e4c7e26c2571395b9fc692cc4
      https://github.com/llvm/llvm-project/commit/41fdb4c53f44281e4c7e26c2571395b9fc692cc4
  Author: LiaoChunyu <chunyu at iscas.ac.cn>
  Date:   2023-02-03 (Fri, 03 Feb 2023)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/tail-calls.ll

  Log Message:
  -----------
  [RISCV] Permit tail call to an externally-defined function with weak linkage

As described in D45395 `This has been modeled after ARM's tail call opt.`
ARM's abi seems to limit weak symbol.

I did not find the limitation for RISCV. (Please correct me if I am wrong)

gcc seems to use the tail-call opt: https://godbolt.org/z/bjWE68n5o

Reviewed By: MaskRay

Differential Revision: https://reviews.llvm.org/D143137