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[Do not merge][Flang][OpenMP] Fix OpenMP static scheduling when trip count is zero #766

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[Do not merge][Flang][OpenMP] Fix OpenMP static scheduling when trip count is zero #766

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[Flang][OpenMP] Fix OpenMP static scheduling when trip count is zero
mjklemm Dec 5, 2025
005a537
Update test case
mjklemm Dec 5, 2025
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5 changes: 4 additions & 1 deletion llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -5377,7 +5377,10 @@ OpenMPIRBuilder::applyStaticChunkedWorkshareLoop(
ConstantInt::get(I32Type, static_cast<int>(DistScheduleSchedType));
Builder.CreateStore(Zero, PLowerBound);
Value *OrigUpperBound = Builder.CreateSub(CastedTripCount, One);
Builder.CreateStore(OrigUpperBound, PUpperBound);
Value *IsTripCountZero = Builder.CreateICmpEQ(CastedTripCount, Zero);
Value *UpperBound =
Builder.CreateSelect(IsTripCountZero, Zero, OrigUpperBound);
Builder.CreateStore(UpperBound, PUpperBound);
Builder.CreateStore(One, PStride);

// Call the "init" function and update the trip count of the loop with the
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