[all-commits] [llvm/llvm-project] e4f153: [flang][debug] generate llvm.fake.use for argument...

[jeanPerier via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: e4f1530edcc95a41e8fd8d13dca295aad814f75d
      https://github.com/llvm/llvm-project/commit/e4f1530edcc95a41e8fd8d13dca295aad814f75d
  Author: jeanPerier <jperier at nvidia.com>
  Date:   2026-04-24 (Fri, 24 Apr 2026)

  Changed paths:
    M flang/include/flang/Optimizer/Dialect/FIROps.td
    M flang/include/flang/Optimizer/Transforms/Passes.td
    M flang/lib/Optimizer/CodeGen/CodeGen.cpp
    M flang/lib/Optimizer/Passes/Pipelines.cpp
    M flang/lib/Optimizer/Transforms/AddDebugInfo.cpp
    A flang/test/Fir/fake_use-codegen.fir
    A flang/test/Transforms/debug-fake-use.fir

  Log Message:
  -----------
  [flang][debug] generate llvm.fake.use for arguments at -g and O0 (#187044)

Fix for https://github.com/llvm/llvm-project/issues/185432.

This patch extends the lifetime of procedure dummy arguments using llvm.fake.use
so that they are accessible in debugger during the whole lifetime of the function.

This is done by:
- adding a new fir.fake_use operation and emitting it in AddDebugInfo.cpp for
   dummy arguments at the end of the procedure scope.
- lower this new fir.fake_use to the llvm.fake.use intrinsic.

This is done under -g at O0 only to avoid pessimizing the generated code when
optimizations are requested.



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