[OpenMP] add offload tests with reduction on complex data types

[ye-luo]

clang-formatting

[jdoerfert]

LG, thanks

openmp/libomptarget/test/offloading/bug49021.cpp

 // RUN: %libomptarget-compilexx-generic -O3 && %libomptarget-run-generic
-
-// Hangs
-// UNSUPPORTED: amdgcn-amd-amdhsa
-// UNSUPPORTED: amdgcn-amd-amdhsa-LTO
+// RUN: %libomptarget-compilexx-generic -O3 -ffast-math && %libomptarget-run-generic
 
 #include <iostream>
 
 template <typename T> int test_map() {
-  std::cout << "map(complex<>)" << std::endl;
+  std::cout << "map(T)" << std::endl;
   T a(0.2), a_check;
 #pragma omp target map(from : a_check)
   { a_check = a; }
 
   if (a_check != a) {
     std::cout << " wrong results";
     return 1;
   }

openmp/libomptarget/test/offloading/complex_reduction.cpp

+// RUN: %libomptarget-compilexx-generic -O3 && %libomptarget-run-generic
+// RUN: %libomptarget-compilexx-generic -O3 -ffast-math && %libomptarget-run-generic
+
+#include <complex>
+#include <iostream>
+
+bool failed = false;
+
+template <typename T> void test_map() {
+  std::cout << "map(complex<T>)" << std::endl;
+  std::complex<T> a(0.2, 1), a_check;
+#pragma omp target map(from : a_check)
+  { a_check = a; }
+
+  if (std::abs(a - a_check) > 1e-6) {
+    std::cout << "wrong map value check" << a_check << " correct value " << a
+              << std::endl;
+    failed = true;
+  }
+}
+
+#if !defined(__NO_UDR)
+#pragma omp declare reduction(+ : std::complex <float> : omp_out += omp_in)
+#pragma omp declare reduction(+ : std::complex <double> : omp_out += omp_in)
+#endif
+
+template <typename T> class initiator {
+public:
+  static T value(int i) { return T(i); }
+};
+
+template <typename T> class initiator<std::complex<T>> {
+public:
+  static std::complex<T> value(int i) { return {T(i), T(-i)}; }
+};
+
+template <typename T> void test_reduction() {
+  T sum(0), sum_host(0);
+  const int size = 100;
+  T array[size];
+  for (int i = 0; i < size; i++) {
+    array[i] = initiator<T>::value(i);
+    sum_host += array[i];
+  }
+
+#pragma omp target teams distribute parallel for map(to : array[:size]) reduction(+ : sum)
+  for (int i = 0; i < size; i++)
+    sum += array[i];
+
+  if (std::abs(sum - sum_host) > 1e-6) {
+    std::cout << "wrong reduction value check" << sum << " correct value "
+              << sum_host << std::endl;
+    failed = true;
+  }
+
+  const int nblock(10), block_size(10);
+  T block_sum[nblock];
+#pragma omp target teams distribute map(to                                     \
+                                        : array[:size])                        \
+    map(from                                                                   \
+        : block_sum[:nblock])
+  for (int ib = 0; ib < nblock; ib++) {
+    T partial_sum(0);
+    const int istart = ib * block_size;
+    const int iend = (ib + 1) * block_size;
+#pragma omp parallel for reduction(+ : partial_sum)
+    for (int i = istart; i < iend; i++)
+      partial_sum += array[i];
+    block_sum[ib] = partial_sum;
+  }
+
+  sum = 0;
+  for (int ib = 0; ib < nblock; ib++)
+    sum += block_sum[ib];
+  if (std::abs(sum - sum_host) > 1e-6) {
+    std::cout << "hierarchical parallelism wrong reduction value check" << sum
+              << " correct value " << sum_host << std::endl;
+    failed = true;
+  }
+}
+
+template <typename T> void test_complex() {
+  test_map<T>();
+  test_reduction<std::complex<T>>();
+}
+
+int main() {
+  std::cout << "Testing complex" << std::endl;
+  std::cout << "Testing float" << std::endl;
+  test_complex<float>();
+  std::cout << "Testing double" << std::endl;
+  test_complex<double>();
+  return failed;
+}