[all-commits] [llvm/llvm-project] 956576: [win][x64] Various fixes for unwind v2 (#154834)

[Daniel Paoliello via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 95657630bda3e73c19d190e25fd9d92b07fc3455
      https://github.com/llvm/llvm-project/commit/95657630bda3e73c19d190e25fd9d92b07fc3455
  Author: Daniel Paoliello <danpao at microsoft.com>
  Date:   2025-08-29 (Fri, 29 Aug 2025)

  Changed paths:
    M llvm/lib/MC/MCWin64EH.cpp
    M llvm/lib/Target/X86/X86WinEHUnwindV2.cpp
    M llvm/test/CodeGen/X86/win64-eh-unwindv2-errors.mir
    M llvm/test/CodeGen/X86/win64-eh-unwindv2.ll

  Log Message:
  -----------
  [win][x64] Various fixes for unwind v2 (#154834)

* `SetFrame` does not count as a stack allocation.
* `mov` in the epilog undoes `SetFrame` (but is not required), it does
not deallocate a stack allocation.
* `mov` in the epilog MUST be before any stack deallocation or register
popping.
* Remove assert for having a prolog without any epilogs (this is
possible for `noreturn` functions, for instance).
* Improve the errors in `MC` to include the problematic function name.



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