[Clang][OMPX] Add the code generation for multi-dim num_teams

Author: shiltian

clang/lib/CodeGen/CGOpenMPRuntime.cpp

@@ -9576,6 +9576,20 @@ static void genMapInfo(const OMPExecutableDirective &D, CodeGenFunction &CGF,
                         MappedVarSet, CombinedInfo);
   genMapInfo(MEHandler, CGF, CombinedInfo, OMPBuilder, MappedVarSet);
 }
+
+static void emitNumTeamsForBareTargetDirective(
+    CodeGenFunction &CGF, const OMPExecutableDirective &D,
+    llvm::SmallVectorImpl<llvm::Value *> &NumTeams) {
+  const auto *C = D.getSingleClause<OMPNumTeamsClause>();
+  assert(!C->varlist_empty() && "ompx_bare requires explicit num_teams");
+  CodeGenFunction::RunCleanupsScope NumTeamsScope(CGF);
+  for (auto *E : C->getNumTeams()) {
+    llvm::Value *V = CGF.EmitScalarExpr(E);
+    NumTeams.push_back(
+        CGF.Builder.CreateIntCast(V, CGF.Int32Ty, /*isSigned=*/true));
+  }
+}
+
 static void emitTargetCallKernelLaunch(
     CGOpenMPRuntime *OMPRuntime, llvm::Function *OutlinedFn,
     const OMPExecutableDirective &D,
@@ -9645,8 +9659,14 @@ static void emitTargetCallKernelLaunch(
       return CGF.Builder.saveIP();
     };
 
+    bool IsBare = D.hasClausesOfKind<OMPXBareClause>();
+    SmallVector<llvm::Value *, 3> NumTeams;
+    if (IsBare)
+      emitNumTeamsForBareTargetDirective(CGF, D, NumTeams);
+    else
+      NumTeams.push_back(OMPRuntime->emitNumTeamsForTargetDirective(CGF, D));
+
     llvm::Value *DeviceID = emitDeviceID(Device, CGF);
-    llvm::Value *NumTeams = OMPRuntime->emitNumTeamsForTargetDirective(CGF, D);
     llvm::Value *NumThreads =
         OMPRuntime->emitNumThreadsForTargetDirective(CGF, D);
     llvm::Value *RTLoc = OMPRuntime->emitUpdateLocation(CGF, D.getBeginLoc());