[all-commits] [llvm/llvm-project] f7bee6: [TailDuplicator] Don't constrain register classes ...

[mikaelholmen via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f7bee65728becbfbf82ba46fd0726f13f43b0e33
      https://github.com/llvm/llvm-project/commit/f7bee65728becbfbf82ba46fd0726f13f43b0e33
  Author: Mikael Holmen <mikael.holmen at ericsson.com>
  Date:   2023-04-26 (Wed, 26 Apr 2023)

  Changed paths:
    M llvm/lib/CodeGen/TailDuplicator.cpp
    A llvm/test/CodeGen/AArch64/tail-duplicate-debug-variance.mir

  Log Message:
  -----------
  [TailDuplicator] Don't constrain register classes due to debug instructions

If cloning a DBG_VALUE instruction, register uses in that instruction could
lead to constraining of a virtual register that would not happen if the
DBG_VALUE was not present at all. This lead to different code with/without
debug info.

Now we only do that register class constraining if we dealing with a non
debug instruction.

Differential Revision: https://reviews.llvm.org/D149146