[all-commits] [llvm/llvm-project] d71839: [flang][acc] Warn when a loop is above its routine...

[Razvan Lupusoru via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: d718391361333d378a5bce643bbdef553f81c203
      https://github.com/llvm/llvm-project/commit/d718391361333d378a5bce643bbdef553f81c203
  Author: Razvan Lupusoru <razvan.lupusoru at gmail.com>
  Date:   2026-09-28 (Mon, 28 Sep 2026)

  Changed paths:
    M flang/lib/Semantics/check-acc-structure.cpp
    M flang/lib/Semantics/check-acc-structure.h
    A flang/test/Semantics/OpenACC/acc-routine-loop-nesting.f90

  Log Message:
  -----------
  [flang][acc] Warn when a loop is above its routine parallelism level (#227041)

OpenACC spec allows a routine to parent a loop at its own parallelism
level or below. A higher level is not allowed: gang inside a worker
routine, gang or worker inside a vector routine, gang, worker, or vector
inside a seq routine, and a gang dimension above the routine's gang
dimension. A device-specific routine clause counts the same way.

Flang accepted these loops with no diagnostic. Warn that the clause is
ignored. A loop at the same level or below is left alone, and illegal
nesting of loops remains an error.



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