[flang][cuda] Add interface and lowering for fence_proxy_async

Author: clementval

flang/include/flang/Optimizer/Builder/IntrinsicCall.h

@@ -274,6 +274,7 @@ struct IntrinsicLibrary {
                                       llvm::ArrayRef<fir::ExtendedValue>);
   template <Extremum, ExtremumBehavior>
   mlir::Value genExtremum(mlir::Type, llvm::ArrayRef<mlir::Value>);
+  void genFenceProxyAsync(llvm::ArrayRef<fir::ExtendedValue>);
   mlir::Value genFloor(mlir::Type, llvm::ArrayRef<mlir::Value>);
   mlir::Value genFraction(mlir::Type resultType,
                           mlir::ArrayRef<mlir::Value> args);

flang/lib/Optimizer/Builder/IntrinsicCall.cpp

@@ -502,6 +502,10 @@ static constexpr IntrinsicHandler handlers[]{
      &I::genExtendsTypeOf,
      {{{"a", asBox}, {"mold", asBox}}},
      /*isElemental=*/false},
+    {"fence_proxy_async",
+     &I::genFenceProxyAsync,
+     {},
+     /*isElemental=*/false},
     {"findloc",
      &I::genFindloc,
      {{{"array", asBox},
@@ -4354,6 +4358,17 @@ IntrinsicLibrary::genExtendsTypeOf(mlir::Type resultType,
                                      fir::getBase(args[1])));
 }
 
+// FENCE_PROXY_ASYNC (CUDA)
+void IntrinsicLibrary::genFenceProxyAsync(
+    llvm::ArrayRef<fir::ExtendedValue> args) {
+  assert(args.size() == 0);
+  auto kind = mlir::NVVM::ProxyKindAttr::get(
+      builder.getContext(), mlir::NVVM::ProxyKind::async_shared);
+  auto space = mlir::NVVM::SharedSpaceAttr::get(
+      builder.getContext(), mlir::NVVM::SharedSpace::shared_cta);
+  mlir::NVVM::FenceProxyOp::create(builder, loc, kind, space);
+}
+
 // FINDLOC
 fir::ExtendedValue
 IntrinsicLibrary::genFindloc(mlir::Type resultType,

flang/module/cudadevice.f90

@@ -2008,6 +2008,11 @@ attributes(device) function barrier_arrive_cnt(barrier, count) result(token)
     end function
   end interface
 
+  interface
+    attributes(device) subroutine fence_proxy_async()
+    end subroutine
+  end interface
+
 contains
 
   attributes(device) subroutine syncthreads()

flang/test/Lower/CUDA/cuda-device-proc.cuf

@@ -419,3 +419,10 @@ end subroutine
 ! CHECK: %[[LLVM_PTR:.*]] = fir.convert %[[DECL_SHARED]]#0 : (!fir.ref<i64>) -> !llvm.ptr
 ! CHECK: %[[SHARED_PTR:.*]] = llvm.addrspacecast %[[LLVM_PTR]] : !llvm.ptr to !llvm.ptr<3>
 ! CHECK: nvvm.mbarrier.arrive.expect_tx %[[SHARED_PTR]], %{{.*}} : !llvm.ptr<3>, i32
+
+attributes(global) subroutine test_fence()
+  call fence_proxy_async()
+end subroutine
+
+! CHECK-LABEL: func.func @_QPtest_fence()
+! CHECK: nvvm.fence.proxy {kind = #nvvm.proxy_kind<async.shared>, space = #nvvm.shared_space<cta>}