[all-commits] [llvm/llvm-project] f27081: [FIR] Avoid generating llvm.undef for dummy scopin...

[Razvan Lupusoru via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: f27081ba6a12685b403181e51a00a3d6f3360ca5
      https://github.com/llvm/llvm-project/commit/f27081ba6a12685b403181e51a00a3d6f3360ca5
  Author: Razvan Lupusoru <razvan.lupusoru at gmail.com>
  Date:   2025-02-20 (Thu, 20 Feb 2025)

  Changed paths:
    M flang/lib/Optimizer/CodeGen/CodeGen.cpp

  Log Message:
  -----------
  [FIR] Avoid generating llvm.undef for dummy scoping info (#128098)

Dummy scoping operations are generated to keep track of scopes for
purpose of Fortran level analyses like Alias Analysis. For codegen, the
scoping info is converted to a fir.undef during pre-codegen rewrite.
Then during declare lowering, this info is no longer used - but it is
still translated to llvm.undef. I cleaned up so it is simply erased. The
generated LLVM should now no longer have a stray undef which looks off
when trying to make sense of the IR.

Co-authored-by: Razvan Lupusoru <rlupusoru at nvidia.com>



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