text: //==----- simd_view_copy_move_assign.cpp  - DPC++ ESIMD on-device test -----==//
  //
  // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
  // See https://llvm.org/LICENSE.txt for license information.
  // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
  //
  //===----------------------------------------------------------------------===//
  // REQUIRES: gpu
  // UNSUPPORTED: cuda || hip
  // RUN: %clangxx -fsycl %s -o %t.out
  // RUN: %GPU_RUN_PLACEHOLDER %t.out
  
  // UNSUPPORTED: windows
  // Temprorary disabled on Windows until intel/llvm-test-suite#664 fixed
  
  // This test checks the behavior of simd_view constructors
  // and assignment operators.
  
  #include "../esimd_test_utils.hpp"
  
  #include <CL/sycl.hpp>
  #include <sycl/ext/intel/experimental/esimd.hpp>
  
  #include <iostream>
  
  using namespace cl::sycl;
  using namespace sycl::ext::intel::experimental::esimd;
  
  template <unsigned VL, class T, class F>
  bool test(queue q, std::string str, F funcUnderTest) {
    std::cout << "Testing " << str << ", VL = " << VL << " ...\n";
    T A[VL];
    T B[VL];
    constexpr unsigned HalfVL = VL > 1 ? (VL / 2) : 1;
  
    // The expected result gets the first half of values from B,
    int gold[VL];
    for (int i = 0; i < VL; ++i) {
      A[i] = -i;
      B[i] = i;
      gold[i] = (i < HalfVL) ? B[i] : A[i];
    }
  
    try {
      buffer<T, 1> bufA(A, range<1>(VL));
      buffer<T, 1> bufB(B, range<1>(VL));
      range<1> glob_range{1};
  
      q.submit([&](handler &cgh) {
         auto PA = bufA.template get_access<access::mode::read_write>(cgh);
         auto PB = bufB.template get_access<access::mode::read>(cgh);
         cgh.parallel_for(glob_range, [=](id<1> i) SYCL_ESIMD_KERNEL {
           using namespace sycl::ext::intel::experimental::esimd;
           unsigned int offset = i * VL * sizeof(T);
           simd<T, VL> va;
           simd<T, VL> vb;
           if constexpr (VL == 1) {
             va[0] = PA[0];
             vb[0] = PB[0];
           } else {
             va.copy_from(PA, offset);
             vb.copy_from(PB, offset);
           }
  
           auto va_view = va.template select<HalfVL, 1>(0);
           auto vb_view = vb.template select<HalfVL, 1>(0);
           funcUnderTest(va_view, vb_view);
  
           if constexpr (VL == 1) {
             PA[0] = va[0];
           } else {
             va.copy_to(PA, offset);
           }
         });
       }).wait_and_throw();
    } catch (sycl::exception const &e) {
      std::cout << "SYCL exception caught: " << e.what() << '\n';
      return false; // not success
    }
  
    int err_cnt = 0;
    for (unsigned i = 0; i < VL; ++i) {
      if (A[i] != gold[i]) {
        err_cnt++;
        std::cout << "failed at index " << i << ": " << A[i] << " != " << gold[i]
                  << " (gold)\n";
      }
    }
  
    if (err_cnt > 0) {
      std::cout << "  pass rate: " << ((float)(VL - err_cnt) / (float)VL) * 100.0f
                << "% (" << (VL - err_cnt) << "/" << VL << ")\n";
    }
  
    std::cout << (err_cnt > 0 ? "  FAILED\n" : "  Passed\n");
    return err_cnt > 0 ? false : true;
  }
  
  template <class T, class FuncT>
  bool tests(queue &Q, std::string Str, FuncT FuncUnderTest) {
    bool Passed = true;
    Passed &= test<8, T>(Q, Str, FuncUnderTest);
    Passed &= test<1, T>(Q, Str, FuncUnderTest);
    return Passed;
  }
  
  template <class T> bool testT(queue &q) {
    std::cout << "--- Testing element type " << typeid(T).name() << " ...\n";
    bool passed = true;
    // copy constructor creates the same view of the underlying data.
    passed &= tests<T>(q, "copy constructor",
                       [](auto &va_view, auto &vb_view) SYCL_ESIMD_FUNCTION {
                         auto va_view_copy(va_view);
                         auto vb_view_copy(vb_view);
                         va_view_copy = vb_view_copy;
                       });
    // move constructor transfers the same view of the underlying data.
    passed &= tests<T>(q, "move constructor",
                       [](auto &va_view, auto &vb_view) SYCL_ESIMD_FUNCTION {
                         auto va_view_move(std::move(va_view));
                         auto vb_view_move(std::move(vb_view));
                         va_view_move = vb_view_move;
                       });
    // assignment operator copies the underlying data.
    passed &= tests<T>(q, "assignment operator",
                       [](auto &va_view, auto &vb_view)
                           SYCL_ESIMD_FUNCTION { va_view = vb_view; });
    // move assignment operator copies the underlying data.
    passed &= tests<T>(q, "move assignment operator",
                       [](auto &va_view, auto &vb_view)
                           SYCL_ESIMD_FUNCTION { va_view = std::move(vb_view); });
  
    // construct complete view of a vector.
  #if 0
    // TODO: When/if template arguments deducing is implemented for simd
    // constructor accepting simd_view are implemented, the following
    // shorter and more elegant version of the code may be used.
    passed &= tests<T>(q, "constructor from simd",
                    [](auto &va_view, auto &vb_view) SYCL_ESIMD_FUNCTION {
                      simd vb = vb_view;
                      simd_view new_vb_view = vb; // ctor from simd
                      va_view = new_vb_view;
                    });
  #else
    passed &= test<8, T>(q, "constructor from simd",
                         [](auto &va_view, auto &vb_view) SYCL_ESIMD_FUNCTION {
                           simd<int, 4> vb = vb_view;
                           simd_view new_vb_view = vb; // ctor from simd
                           va_view = new_vb_view;
                         });
    passed &= test<1, T>(q, "constructor from simd",
                         [](auto &va_view, auto &vb_view) SYCL_ESIMD_FUNCTION {
                           simd<int, 1> vb = vb_view;
                           simd_view new_vb_view = vb; // ctor from simd
                           va_view = new_vb_view;
                         });
  #endif
  
    return passed;
  }
  
  int main(void) {
    queue q(esimd_test::ESIMDSelector{}, esimd_test::createExceptionHandler());
    auto dev = q.get_device();
    std::cout << "Running on " << dev.get_info<info::device::name>() << "\n";
    bool passed = true;
    passed &= testT<char>(q);
    passed &= testT<short>(q);
    passed &= testT<int>(q);
    passed &= testT<float>(q);
    passed &= testT<half>(q);
  
    return passed ? 0 : 1;
  }
  