[PATCH] D94087: [flang][openmp]At most one threads, simd and depend clause can appear on OpenMP ORDERED construct.

[Valentin Clement via Phabricator via llvm-commits]

clementval added inline comments.


================
Comment at: flang/test/Semantics/omp-clause-validity01.f90:489
+  !ERROR: At most one DEPEND clause can appear on the ORDERED directive
+  !$omp ordered depend(source) depend(source)
+  !ERROR: At most one THREADS clause can appear on the ORDERED directive
----------------
kiranchandramohan wrote:
> Will this catch two or more depend(sink: v) clauses accidentally?
> ```
> At most one depend(source) clause can appear on an ordered construct.
> ```
> 
> Can threads, simd occur with depend? Is that handled by the parser?
According to the standard multiple `depend(sink: vec)` are allowed so you will need to make a specific check for the depend clause since the general allowedOnce check does not support this. 

@kiranchandramohan With the current patch `threads`, `simd` and `depend` are allowed together. The parser is not limiting clauses. 


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Comment at: llvm/include/llvm/Frontend/OpenMP/OMP.td:461
     VersionedClause<OMPC_Simd>,
     VersionedClause<OMPC_Depend>
   ];
----------------
`OMPC_Depend` should probably be in `allowedClauses` and specific check done in `check-omp-structure` for the difference between `depend(source)` and `depend(sink:vec)`


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  https://reviews.llvm.org/D94087/new/

https://reviews.llvm.org/D94087