[all-commits] [llvm/llvm-project] 501417: [RISC-V][LoongArch] Revert Musttail Fixes (#191508)

[Sam Elliott via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 501417baa60f2eb0a66ca3bb04caf70150ebc2f7
      https://github.com/llvm/llvm-project/commit/501417baa60f2eb0a66ca3bb04caf70150ebc2f7
  Author: Sam Elliott <aelliott at qti.qualcomm.com>
  Date:   2026-04-10 (Fri, 10 Apr 2026)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchMachineFunctionInfo.h
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVMachineFunctionInfo.h
    R llvm/test/CodeGen/LoongArch/issue187832.ll
    R llvm/test/CodeGen/LoongArch/musttail.ll
    M llvm/test/CodeGen/LoongArch/tail-calls.ll
    M llvm/test/CodeGen/RISCV/musttail-call.ll
    R llvm/test/CodeGen/RISCV/musttail.ll
    R llvm/test/CodeGen/RISCV/pr187832.ll
    M llvm/test/CodeGen/RISCV/tail-calls.ll

  Log Message:
  -----------
  [RISC-V][LoongArch] Revert Musttail Fixes (#191508)

This reverts:
- 2b839f66ae0191039fb82049ec515bcbd726f612 (#168506)
- 6a81656f7d729615c296e5da774e78ad5b21a558 (#170547)
- ab17b5408ac83a03807b6f0ea22f51dfb84b0b8a (#188006)
- e65dd1f8a0c8cfd2255f336e5096232f587ed397 (#191093)

The changes in #168506 and #170547 both have a lifetime issue where an
SDValue is kept for the duration of a function, despite being valid only
when processing the same basic block.

Reverting both on LoongArch and RISC-V as the implementations are
identical and one of the fix commits touches both targets, rather than
doing only a RISC-V revert. I also think this more cleanly shows what is
being undone when starting again with the changes.



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