[SYCL][ESIMD] Add on-device tests.

sycl/test/esimd/on-device/README

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+This directory contains ESIMD tests which are run on Intel GPU device only.
+Some of them can run on host device too, but in general it is not always
+possible as some of ESIMD APIs (e.g. memory access via accessors) is not
+implemented for the host device.

sycl/test/esimd/on-device/accessor.cpp

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+//==---------------- accessor.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
+//
+//===----------------------------------------------------------------------===//
+// TODO enable on Windows
+// REQUIRES: linux
+// REQUIRES: gpu
+// RUN: %clangxx-esimd -fsycl -D_CRT_SECURE_NO_WARNINGS=1 %s -o %t.out
+// RUN: %ESIMD_RUN_PLACEHOLDER %t.out
+
+// This test checks that accessor-based memory accesses work correctly in ESIMD.
+
+#include "esimd_test_utils.hpp"
+
+#include <CL/sycl.hpp>
+#include <CL/sycl/intel/esimd.hpp>
+
+#include <iostream>
+
+using namespace cl::sycl;
+
+constexpr unsigned int VL = 1024 * 128;
+
+using Ty = float;
+
+int main() {
+  Ty data0[VL] = {0};
+  Ty data1[VL] = {0};
+  constexpr Ty VAL = 5;
+
+  for (int i = 0; i < VL; i++) {
+    data0[i] = i;
+  }
+
+  try {
+    queue q(esimd_test::ESIMDSelector{}, esimd_test::createExceptionHandler());
+
+    buffer<Ty, 1> buf0(data0, range<1>(VL));
+    buffer<Ty, 1> buf1(data1, range<1>(VL));
+
+    q.submit([&](handler &cgh) {
+      std::cout << "Running on "
+                << q.get_device().get_info<cl::sycl::info::device::name>()
+                << "\n";
+
+      auto acc0 = buf0.get_access<access::mode::read_write>(cgh);
+      auto acc1 = buf1.get_access<access::mode::write>(cgh);
+
+      cgh.parallel_for<class Test>(
+          range<1>(1), [=](sycl::id<1> i) SYCL_ESIMD_KERNEL {
+            using namespace sycl::intel::gpu;
+            unsigned int offset = 0;
+            for (int k = 0; k < VL / 16; k++) {
+              simd<Ty, 16> var = block_load<Ty, 16>(acc0, offset);
+              var += VAL;
+              block_store(acc0, offset, var);
+              block_store(acc1, offset, var + 1);
+              offset += 64;
+            }
+          });
+    });
+
+    q.wait();
+
+  } catch (cl::sycl::exception const &e) {
+    std::cout << "SYCL exception caught: " << e.what() << '\n';
+    return 2;
+  }
+
+  int err_cnt = 0;
+
+  for (int i = 0; i < VL; i++) {
+    Ty gold0 = i + VAL;
+    Ty gold1 = gold0 + 1;
+    Ty val0 = data0[i];
+    Ty val1 = data1[i];
+
+    if (val0 != gold0) {
+      if (++err_cnt < 10)
+        std::cerr << "*** ERROR at data0[" << i << "]: " << val0
+                  << " != " << gold0 << "(gold)\n";
+    }
+    if (val1 != gold1) {
+      if (++err_cnt < 10)
+        std::cerr << "*** ERROR at data1[" << i << "]: " << val1
+                  << " != " << gold1 << "(gold)\n";
+    }
+  }
+  if (err_cnt == 0) {
+    std::cout << "Passed\n";
+    return 0;
+  } else {
+    std::cout << "Failed: " << err_cnt << " of " << VL << " errors\n";
+    return 1;
+  }
+}

sycl/test/esimd/on-device/esimd_test_utils.hpp

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+//==--------- esimd_test_utils.hpp - DPC++ ESIMD on-device test utilities --==//
+//
+// 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
+//
+//===----------------------------------------------------------------------===//
+
+#include <CL/sycl.hpp>
+
+#define NOMINMAX
+
+#include <algorithm>
+#include <cstring>
+#include <fstream>
+#include <iostream>
+#include <iterator>
+#include <vector>
+
+using namespace cl::sycl;
+
+namespace esimd_test {
+
+// This is the class provided to SYCL runtime by the application to decide
+// on which device to run, or whether to run at all.
+// When selecting a device, SYCL runtime first takes (1) a selector provided by
+// the program or a default one and (2) the set of all available devices. Then
+// it passes each device to the '()' operator of the selector. Device, for
+// which '()' returned the highest number, is selected. If a negative number
+// was returned for all devices, then the selection process will cause an
+// exception.
+class ESIMDSelector : public device_selector {
+  // Require GPU device unless HOST is requested in SYCL_DEVICE_TYPE env
+  virtual int operator()(const device &device) const {
+    if (const char *dev_type = getenv("SYCL_DEVICE_TYPE")) {
+      if (!strcmp(dev_type, "GPU"))
+        return device.is_gpu() ? 1000 : -1;
+      if (!strcmp(dev_type, "HOST"))
+        return device.is_host() ? 1000 : -1;
+      std::cerr << "Supported 'SYCL_DEVICE_TYPE' env var values are 'GPU' and "
+                   "'HOST', '"
+                << dev_type << "' is not.\n";
+      return -1;
+    }
+    // If "SYCL_DEVICE_TYPE" not defined, only allow gpu device
+    return device.is_gpu() ? 1000 : -1;
+  }
+};
+
+inline auto createExceptionHandler() {
+  return [](exception_list l) {
+    for (auto ep : l) {
+      try {
+        std::rethrow_exception(ep);
+      } catch (cl::sycl::exception &e0) {
+        std::cout << "sycl::exception: " << e0.what() << std::endl;
+      } catch (std::exception &e) {
+        std::cout << "std::exception: " << e.what() << std::endl;
+      } catch (...) {
+        std::cout << "generic exception\n";
+      }
+    }
+  };
+}
+
+template <typename T>
+std::vector<T> read_binary_file(const char *fname, size_t num = 0) {
+  std::vector<T> vec;
+  std::ifstream ifs(fname, std::ios::in | std::ios::binary);
+  if (ifs.good()) {
+    ifs.unsetf(std::ios::skipws);
+    std::streampos file_size;
+    ifs.seekg(0, std::ios::end);
+    file_size = ifs.tellg();
+    ifs.seekg(0, std::ios::beg);
+    size_t max_num = file_size / sizeof(T);
+    vec.resize(num ? (std::min)(max_num, num) : max_num);
+    ifs.read(reinterpret_cast<char *>(vec.data()), vec.size() * sizeof(T));
+  }
+  return vec;
+}
+
+template <typename T>
+bool write_binary_file(const char *fname, const std::vector<T> &vec,
+                       size_t num = 0) {
+  std::ofstream ofs(fname, std::ios::out | std::ios::binary);
+  if (ofs.good()) {
+    ofs.write(reinterpret_cast<const char *>(&vec[0]),
+              (num ? num : vec.size()) * sizeof(T));
+    ofs.close();
+  }
+  return !ofs.bad();
+}
+
+template <typename T>
+bool cmp_binary_files(const char *fname1, const char *fname2, T tolerance) {
+  const auto vec1 = read_binary_file<T>(fname1);
+  const auto vec2 = read_binary_file<T>(fname2);
+  if (vec1.size() != vec2.size()) {
+    std::cerr << fname1 << " size is " << vec1.size();
+    std::cerr << " whereas " << fname2 << " size is " << vec2.size()
+              << std::endl;
+    return false;
+  }
+  for (size_t i = 0; i < vec1.size(); i++) {
+    if (abs(vec1[i] - vec2[i]) > tolerance) {
+      std::cerr << "Mismatch at " << i << ' ';
+      if (sizeof(T) == 1) {
+        std::cerr << (int)vec1[i] << " vs " << (int)vec2[i] << std::endl;
+      } else {
+        std::cerr << vec1[i] << " vs " << vec2[i] << std::endl;
+      }
+      return false;
+    }
+  }
+  return true;
+}
+
+// dump every element of sequence [first, last) to std::cout
+template <typename ForwardIt> void dump_seq(ForwardIt first, ForwardIt last) {
+  using ValueT = typename std::iterator_traits<ForwardIt>::value_type;
+  std::copy(first, last, std::ostream_iterator<ValueT>{std::cout, " "});
+  std::cout << std::endl;
+}
+
+// Checks wether ranges [first, last) and [ref_first, ref_last) are equal.
+// If a mismatch is found, dumps elements that differ and returns true,
+// otherwise false is returned.
+template <typename ForwardIt, typename RefForwardIt, typename BinaryPredicateT>
+bool check_fail_seq(ForwardIt first, ForwardIt last, RefForwardIt ref_first,
+                    RefForwardIt ref_last, BinaryPredicateT is_equal) {
+  auto mism = std::mismatch(first, last, ref_first, is_equal);
+  if (mism.first != last) {
+    std::cout << "mismatch: returned " << *mism.first << std::endl;
+    std::cout << "          expected " << *mism.second << std::endl;
+    return true;
+  }
+  return false;
+}
+
+template <typename ForwardIt, typename RefForwardIt>
+bool check_fail_seq(ForwardIt first, ForwardIt last, RefForwardIt ref_first,
+                    RefForwardIt ref_last) {
+  return check_fail_seq(
+      first, last, ref_first, ref_last,
+      [](const auto &lhs, const auto &rhs) { return lhs == rhs; });
+}
+
+// analog to C++20 bit_cast
+template <typename To, typename From,
+          typename std::enable_if<(sizeof(To) == sizeof(From)) &&
+                                      std::is_trivially_copyable<From>::value &&
+                                      std::is_trivial<To>::value,
+                                  int>::type = 0>
+To bit_cast(const From &src) noexcept {
+  To dst;
+  std::memcpy(&dst, &src, sizeof(To));
+  return dst;
+}
+
+} // namespace esimd_test