[flang][OpenMP] Compiler crash with nowait on target construct

[abidh]

Consider the following program.

program nowait_reproducer
   implicit none

   real x

   !$omp target map(tofrom: x) nowait
      x = 5
   !$omp end target

end program nowait_reproducer

Compiling it with the following cause the compiler to crash

flang -fopenmp test.f90

Note that adding --offload-arch makes the crash go away. The call stack of the crash site looks like as follows:

llvm::CallInst::init
llvm::IRBuilderBase::CreateCall
llvm::OpenMPIRBuilder::emitTargetTask
llvm::OpenMPIRBuilder::finalize
mlir::LLVM::ModuleTranslation::~ModuleTranslation

[abidh]

Hi @ergawy
I thought I will bring it to your notice as you seem to have worked in this area.

[ergawy]

Thanks Abid. I will take a look at this.