[all-commits] [llvm/llvm-project] b3b5e3: [flang] Lower loops whose branching is confined to...

[Kareem Ergawy via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b3b5e3303fdaec4bcc524bf834a9bed77c164fc2
      https://github.com/llvm/llvm-project/commit/b3b5e3303fdaec4bcc524bf834a9bed77c164fc2
  Author: Kareem Ergawy <kergawy at nvidia.com>
  Date:   2026-09-29 (Tue, 29 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 (#225758)

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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