[flang][cuda] Carry over the CUDA attribute in target rewrite (#136811)

Author: clementval

flang/lib/Optimizer/CodeGen/TargetRewrite.cpp

@@ -531,6 +531,11 @@ class TargetRewrite : public fir::impl::TargetRewritePassBase<TargetRewrite> {
       if (callOp.getClusterSizeZ())
         newCall.getClusterSizeZMutable().assign(callOp.getClusterSizeZ());
       newCallResults.append(newCall.result_begin(), newCall.result_end());
+      if (auto cudaProcAttr =
+              callOp->template getAttrOfType<cuf::ProcAttributeAttr>(
+                  cuf::getProcAttrName())) {
+        newCall->setAttr(cuf::getProcAttrName(), cudaProcAttr);
+      }
     } else if constexpr (std::is_same_v<std::decay_t<A>, fir::CallOp>) {
       fir::CallOp newCall;
       if (callOp.getCallee()) {

flang/test/Fir/CUDA/cuda-target-rewrite.mlir

@@ -45,7 +45,7 @@ gpu.module @testmod {
 func.func @main(%arg0: complex<f64>) {
   %0 = llvm.mlir.constant(0 : i64) : i64
   %1 = llvm.mlir.constant(0 : i32) : i32
-  gpu.launch_func  @testmod::@_QPtest blocks in (%0, %0, %0) threads in (%0, %0, %0) : i64 dynamic_shared_memory_size %1 args(%arg0 : complex<f64>)
+  gpu.launch_func  @testmod::@_QPtest blocks in (%0, %0, %0) threads in (%0, %0, %0) : i64 dynamic_shared_memory_size %1 args(%arg0 : complex<f64>) {cuf.proc_attr = #cuf.cuda_proc<global>}
   return
 }
 
@@ -54,4 +54,4 @@ func.func @main(%arg0: complex<f64>) {
 // CHECK-LABEL: gpu.func @_QPtest
 // CHECK-SAME: (%arg0: f64, %arg1: f64) kernel {
 // CHECK: gpu.return
-// CHECK: gpu.launch_func  @testmod::@_QPtest blocks in (%{{.*}}, %{{.*}}, %{{.*}}) threads in (%{{.*}}, %{{.*}}, %{{.*}}) : i64 dynamic_shared_memory_size %{{.*}} args(%{{.*}} : f64, %{{.*}} : f64)
+// CHECK: gpu.launch_func  @testmod::@_QPtest blocks in (%{{.*}}, %{{.*}}, %{{.*}}) threads in (%{{.*}}, %{{.*}}, %{{.*}}) : i64 dynamic_shared_memory_size %{{.*}} args(%{{.*}} : f64, %{{.*}} : f64) {cuf.proc_attr = #cuf.cuda_proc<global>}