[PATCH] D113602: [OpenMP] Fix master thread barrier for Pascal and amdgpu

[Johannes Doerfert via Phabricator via llvm-commits]

jdoerfert added inline comments.


================
Comment at: llvm/lib/Transforms/IPO/OpenMPOpt.cpp:3463
+    //                       BlockSize = BlockHwSize - WarpSize;
+    //                       bool IsWorker = InitCB >= 0 && InitCB < BlockSize;
     //                       if (IsWorker) {
----------------
This doesn't quite work because now every thread in the last warp will execute the user code.
I think the minimal addition is
```
if (InitCB <u BlockSize)
  return;
```
and then whatever we had before.


================
Comment at: llvm/lib/Transforms/IPO/OpenMPOpt.cpp:3547
+    IsWorker->setDebugLoc(DLoc);
+    BranchInst::Create(StateMachineBeginBB, UserCodeEntryBB, IsWorker, InitBB);
 
----------------
-master +main


================
Comment at: openmp/libomptarget/DeviceRTL/src/Kernel.cpp:103
+  if (UseGenericStateMachine &&
+      mapping::getThreadIdInBlock() < mapping::getBlockSize())
     genericStateMachine(Ident);
----------------
-master +main


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  https://reviews.llvm.org/D113602/new/

https://reviews.llvm.org/D113602