[llvm-bugs] [Bug 46185] New: Dependencies for undeferred detached tasks are missing

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=46185

            Bug ID: 46185
           Summary: Dependencies for undeferred detached tasks are missing
           Product: OpenMP
           Version: unspecified
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: Clang Compiler Support
          Assignee: unassignedclangbugs at nondot.org
          Reporter: protze at itc.rwth-aachen.de
                CC: llvm-bugs at lists.llvm.org

Created attachment 23570
  --> https://bugs.llvm.org/attachment.cgi?id=23570&action=edit
reproducer

Without detached tasks, any outgoing dependencies for undeferred tasks (if(0))
could be ignored. 
For detached tasks, tracking this dependency is necessary. 

As I understand the generated code, the dependencies are not passed to the
task, but rather  __kmpc_omp_wait_deps blocks for the incoming dependencies.


  call void @__kmpc_omp_wait_deps ...
  call void @__kmpc_omp_task_begin_if0 ...


Therefore, the second task in the attached code does not wait for the
completion of the first task, which would be the call to omp_event_fulfill at
the end.

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