[OMPIRBuilder] Fix addrspace of internal critical section lock (llvm#166459)

First, for internal variables, they are always global, so use the global
AS by default unless specified otherwise. We can't really use `0` as a
default like we do now because that has an actual meaning on some
targets, so we really need specified vs unspecified, so I used
`std::optional` which is already used in many places in OMPIRBuilder.

Second, for the critical lock variable, add an addrspace cast if needed.

Signed-off-by: Nick Sarnie <[email protected]>

Author: sarnex

clang/lib/CodeGen/CGOpenMPRuntime.cpp

@@ -2000,22 +2000,29 @@ void CGOpenMPRuntime::emitCriticalRegion(CodeGenFunction &CGF,
   // Prepare arguments and build a call to __kmpc_critical
   if (!CGF.HaveInsertPoint())
     return;
+  llvm::FunctionCallee RuntimeFcn = OMPBuilder.getOrCreateRuntimeFunction(
+      CGM.getModule(),
+      Hint ? OMPRTL___kmpc_critical_with_hint : OMPRTL___kmpc_critical);
+  llvm::Value *LockVar = getCriticalRegionLock(CriticalName);
+  unsigned LockVarArgIdx = 2;
+  if (cast<llvm::GlobalVariable>(LockVar)->getAddressSpace() !=
+      RuntimeFcn.getFunctionType()
+          ->getParamType(LockVarArgIdx)
+          ->getPointerAddressSpace())
+    LockVar = CGF.Builder.CreateAddrSpaceCast(
+        LockVar, RuntimeFcn.getFunctionType()->getParamType(LockVarArgIdx));
   llvm::Value *Args[] = {emitUpdateLocation(CGF, Loc), getThreadID(CGF, Loc),
-                         getCriticalRegionLock(CriticalName)};
+                         LockVar};
   llvm::SmallVector<llvm::Value *, 4> EnterArgs(std::begin(Args),
                                                 std::end(Args));
   if (Hint) {
     EnterArgs.push_back(CGF.Builder.CreateIntCast(
         CGF.EmitScalarExpr(Hint), CGM.Int32Ty, /*isSigned=*/false));
   }
-  CommonActionTy Action(
-      OMPBuilder.getOrCreateRuntimeFunction(
-          CGM.getModule(),
-          Hint ? OMPRTL___kmpc_critical_with_hint : OMPRTL___kmpc_critical),
-      EnterArgs,
-      OMPBuilder.getOrCreateRuntimeFunction(CGM.getModule(),
-                                            OMPRTL___kmpc_end_critical),
-      Args);
+  CommonActionTy Action(RuntimeFcn, EnterArgs,
+                        OMPBuilder.getOrCreateRuntimeFunction(
+                            CGM.getModule(), OMPRTL___kmpc_end_critical),
+                        Args);
   CriticalOpGen.setAction(Action);
   emitInlinedDirective(CGF, OMPD_critical, CriticalOpGen);
 }

clang/test/OpenMP/force-usm.c

@@ -46,7 +46,7 @@ int main(void) {
 // CHECK-USM-NEXT:    br i1 [[EXEC_USER_CODE]], label [[USER_CODE_ENTRY:%.*]], label [[WORKER_EXIT:%.*]]
 // CHECK-USM:       user_code.entry:
 // CHECK-USM-NEXT:    store i32 1, ptr [[TMP0]], align 4
-// CHECK-USM-NEXT:    [[TMP2:%.*]] = load ptr, ptr @pGI_decl_tgt_ref_ptr, align 8
+// CHECK-USM-NEXT:    [[TMP2:%.*]] = load ptr, ptr addrspace(1) @pGI_decl_tgt_ref_ptr, align 8
 // CHECK-USM-NEXT:    [[TMP3:%.*]] = load ptr, ptr [[TMP2]], align 8
 // CHECK-USM-NEXT:    store i32 2, ptr [[TMP3]], align 4
 // CHECK-USM-NEXT:    call void @__kmpc_target_deinit()

clang/test/OpenMP/spirv_target_codegen_basic.cpp

@@ -6,12 +6,18 @@
 // CHECK: @__omp_offloading_{{.*}}_dynamic_environment = weak_odr protected addrspace(1) global %struct.DynamicEnvironmentTy zeroinitializer
 // CHECK: @__omp_offloading_{{.*}}_kernel_environment = weak_odr protected addrspace(1) constant %struct.KernelEnvironmentTy
 
+// CHECK: @"_gomp_critical_user_$var" = common addrspace(1) global [8 x i32] zeroinitializer, align 8
+
 // CHECK: define weak_odr protected spir_kernel void @__omp_offloading_{{.*}}
 
+// CHECK: call spir_func addrspace(9) void @__kmpc_critical(ptr addrspace(4) addrspacecast (ptr addrspace(1) @{{.*}} to ptr addrspace(4)), i32 %{{.*}}, ptr addrspace(4) addrspacecast (ptr addrspace(1) @"_gomp_critical_user_$var" to ptr addrspace(4)))
+// CHECK: call spir_func addrspace(9) void @__kmpc_end_critical(ptr addrspace(4) addrspacecast (ptr addrspace(1) @{{.*}} to ptr addrspace(4)), i32 %{{.*}}, ptr addrspace(4) addrspacecast (ptr addrspace(1) @"_gomp_critical_user_$var" to ptr addrspace(4)))
+
 int main() {
   int ret = 0;
   #pragma omp target
   for(int i = 0; i < 5; i++)
+    #pragma omp critical
     ret++;
   return ret;
 }

llvm/include/llvm/Frontend/OpenMP/OMPIRBuilder.h

@@ -3654,7 +3654,7 @@ class OpenMPIRBuilder {
   /// \param Name Name of the variable.
   LLVM_ABI GlobalVariable *
   getOrCreateInternalVariable(Type *Ty, const StringRef &Name,
-                              unsigned AddressSpace = 0);
+                              std::optional<unsigned> AddressSpace = {});
 };
 
 /// Class to represented the control flow structure of an OpenMP canonical loop.

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -8460,9 +8460,8 @@ OpenMPIRBuilder::createPlatformSpecificName(ArrayRef<StringRef> Parts) const {
                                                 Config.separator());
 }
 
-GlobalVariable *
-OpenMPIRBuilder::getOrCreateInternalVariable(Type *Ty, const StringRef &Name,
-                                             unsigned AddressSpace) {
+GlobalVariable *OpenMPIRBuilder::getOrCreateInternalVariable(
+    Type *Ty, const StringRef &Name, std::optional<unsigned> AddressSpace) {
   auto &Elem = *InternalVars.try_emplace(Name, nullptr).first;
   if (Elem.second) {
     assert(Elem.second->getValueType() == Ty &&
@@ -8472,16 +8471,18 @@ OpenMPIRBuilder::getOrCreateInternalVariable(Type *Ty, const StringRef &Name,
     // variable for possibly changing that to internal or private, or maybe
     // create different versions of the function for different OMP internal
     // variables.
+    const DataLayout &DL = M.getDataLayout();
+    unsigned AddressSpaceVal =
+        AddressSpace ? *AddressSpace : DL.getDefaultGlobalsAddressSpace();
     auto Linkage = this->M.getTargetTriple().getArch() == Triple::wasm32
                        ? GlobalValue::InternalLinkage
                        : GlobalValue::CommonLinkage;
     auto *GV = new GlobalVariable(M, Ty, /*IsConstant=*/false, Linkage,
                                   Constant::getNullValue(Ty), Elem.first(),
                                   /*InsertBefore=*/nullptr,
-                                  GlobalValue::NotThreadLocal, AddressSpace);
-    const DataLayout &DL = M.getDataLayout();
+                                  GlobalValue::NotThreadLocal, AddressSpaceVal);
     const llvm::Align TypeAlign = DL.getABITypeAlign(Ty);
-    const llvm::Align PtrAlign = DL.getPointerABIAlignment(AddressSpace);
+    const llvm::Align PtrAlign = DL.getPointerABIAlignment(AddressSpaceVal);
     GV->setAlignment(std::max(TypeAlign, PtrAlign));
     Elem.second = GV;
   }