[all-commits] [llvm/llvm-project] b69b6b: DAG: Return the chain from ExpandLibCall

[Matt Arsenault via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b69b6b8399ec49c53617f7cee152028300f1ab4e
      https://github.com/llvm/llvm-project/commit/b69b6b8399ec49c53617f7cee152028300f1ab4e
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-06-30 (Fri, 30 Jun 2023)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp

  Log Message:
  -----------
  DAG: Return the chain from ExpandLibCall

If the libcall expansion requires use of the inserted call's result
chain, it's unreliable to query it from the main result. The call
lowering may have added additional casts or other obscuring operations
we don't want to parse through.


  Commit: 160d7227e043cd8f491cb706916da953cabfd905
      https://github.com/llvm/llvm-project/commit/160d7227e043cd8f491cb706916da953cabfd905
  Author: Matt Arsenault <Matthew.Arsenault at amd.com>
  Date:   2023-06-30 (Fri, 30 Jun 2023)

  Changed paths:
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    A llvm/test/CodeGen/ARM/llvm.frexp.ll

  Log Message:
  -----------
  DAG: Fix libcall expansion for frexp on ARM

The ExpandLibcallResult result was a bitcast and not the direct call
result, so we couldn't find the chain. Use the new separate chain
return value instead.


Compare: https://github.com/llvm/llvm-project/compare/1c814c99aaed...160d7227e043