[all-commits] [llvm/llvm-project] 1463f9: [flang] Lower loops whose branching is confined to...

[Kareem Ergawy via All-commits]

  Branch: refs/heads/users/ergawy/unstructured-lower-category-c
  Home:   https://github.com/llvm/llvm-project
  Commit: 1463f94f260a7d5602eeaa6ab7107b6b577e9e70
      https://github.com/llvm/llvm-project/commit/1463f94f260a7d5602eeaa6ab7107b6b577e9e70
  Author: ergawy <kareem.ergawy at gmail.com>
  Date:   2026-09-25 (Fri, 25 Sep 2026)

  Changed paths:
    M flang/include/flang/Lower/AbstractConverter.h
    M flang/include/flang/Lower/PFTBuilder.h
    M flang/lib/Lower/Bridge.cpp
    M flang/lib/Lower/OpenMP/OpenMP.cpp
    M flang/lib/Lower/PFTBuilder.cpp
    M flang/test/Lower/OpenACC/acc-cache.f90
    A flang/test/Lower/OpenACC/acc-unstructured-internals.f90
    M flang/test/Lower/OpenACC/acc-unstructured.f90
    R flang/test/Lower/OpenMP/Todo/metadirective-loop-unstructured.f90
    A flang/test/Lower/OpenMP/metadirective-loop-unstructured.f90
    M flang/test/Lower/OpenMP/wsloop-unstructured-cycle.f90
    A flang/test/Lower/OpenMP/wsloop-unstructured-internals.f90
    M flang/test/Lower/always-execute-loop-body.f90
    A flang/test/Lower/do-loop-branch-to-loop-header.f90
    M flang/test/Lower/do-loop-infinite-body-cycle.f90
    M flang/test/Lower/do_loop_unstructured.f90
    M flang/test/Lower/select-case-statement.f90

  Log Message:
  -----------
  [flang] Lower loops whose branching is confined to their body structurally

Such a loop was classified separately by a previous change but still
lowered as a raw CFG, so its structured form was lost.

Lower it structurally instead, with its body folded into a region that can
hold the branching. The loop keeps its bounds on the op, so it remains
available to whatever transforms or parallelizes it. Only the body is
folded: the loop control statements are emitted as they are for any
structured loop, since a branch from outside may target either of them.

Loops an OpenACC or OpenMP directive owns are lowered the same way, so
they keep their form too.



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