//==------------- operator_decrement.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
//
//===----------------------------------------------------------------------===//
// This is a test for a bug found simd_view::operator--
//
// RUN: %{build} -o %t.out
// RUN: %{run} %t.out

#include "../esimd_test_utils.hpp"

using namespace sycl;

int main(void) {
  constexpr unsigned Size = 1024;
  constexpr unsigned VL = 16;

  float *A = new float[Size];

  for (unsigned i = 0; i < Size; ++i) {
    A[i] = i + 1;
  }

  try {
    buffer<float, 1> bufa(A, range<1>(Size));

    // We need that many workgroups
    range<1> GlobalRange{Size / VL};

    // We need that many threads in each group
    range<1> LocalRange{1};

    queue q(esimd_test::ESIMDSelector, esimd_test::createExceptionHandler());

    auto dev = q.get_device();
    std::cout << "Running on " << dev.get_info<info::device::name>() << "\n";

    auto e = q.submit([&](handler &cgh) {
      auto PA = bufa.get_access<access::mode::read_write>(cgh);
      cgh.parallel_for<class Test>(
          GlobalRange * LocalRange, [=](id<1> i) SYCL_ESIMD_KERNEL {
            using namespace sycl::ext::intel::esimd;
            unsigned int offset = i * VL * sizeof(float);
            simd<float, VL> va;
            va.copy_from(PA, offset);
            auto va_view = va.select<VL, 1>(0);
            va_view--;
            va.copy_to(PA, offset);
          });
    });
    e.wait();
  } catch (sycl::exception const &e) {
    std::cout << "SYCL exception caught: " << e.what() << '\n';

    delete[] A;
    return 1;
  }

  int err_cnt = 0;

  for (unsigned i = 0; i < Size; ++i) {
    if (A[i] != i) {
      if (++err_cnt < 10) {
        std::cout << "failed at index " << i << ", " << A[i] << " != " << i
                  << "\n";
      }
    }
  }
  if (err_cnt > 0) {
    std::cout << "  pass rate: "
              << ((float)(Size - err_cnt) / (float)Size) * 100.0f << "% ("
              << (Size - err_cnt) << "/" << Size << ")\n";
  }

  delete[] A;

  std::cout << (err_cnt > 0 ? "FAILED\n" : "Passed\n");
  return err_cnt > 0 ? 1 : 0;
}