[ESIMD] E2E test for simd_view copy and move ctors (#400)

Author: DenisBakhvalov

SYCL/ESIMD/api/simd_view_copy_move_assign.cpp

@@ -0,0 +1,119 @@
+//==----- 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
+// RUN: %clangxx -fsycl %s -o %t.out
+// RUN: %GPU_RUN_PLACEHOLDER %t.out
+//
+
+// 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 <class T> bool test(queue q, std::string str, T funcUnderTest) {
+  std::cout << "Testing " << str << " ...\n";
+  constexpr unsigned VL = 8;
+
+  int A[VL];
+  int B[VL];
+  // As a result, A should have first 4 values from B, next 4 values from A.
+  int gold[VL] = {0, 1, 2, 3, -4, -5, -6, -7};
+
+  for (unsigned i = 0; i < VL; ++i) {
+    A[i] = -i;
+    B[i] = i;
+  }
+
+  try {
+    buffer<int, 1> bufA(A, range<1>(VL));
+    buffer<int, 1> bufB(B, range<1>(VL));
+    range<1> glob_range{1};
+
+    auto e = q.submit([&](handler &cgh) {
+      auto PA = bufA.template get_access<access::mode::read_write>(cgh);
+      auto PB = bufB.template get_access<access::mode::read_write>(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(int);
+        simd<int, VL> va;
+        va.copy_from(PA, offset);
+        simd<int, VL> vb;
+        vb.copy_from(PB, offset);
+        auto va_view = va.select<4, 1>(0);
+        auto vb_view = vb.select<4, 1>(0);
+
+        funcUnderTest(va_view, vb_view);
+
+        va.copy_to(PA, offset);
+        vb.copy_to(PB, offset);
+      });
+    });
+    q.wait_and_throw();
+  } catch (cl::sycl::exception const &e) {
+    std::cout << "SYCL exception caught: " << e.what() << '\n';
+    return e.get_cl_code();
+  }
+
+  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;
+}
+
+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;
+  // copy constructor creates the same view of the underlying data.
+  passed &= test(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 &= test(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 &= test(q, "assignment operator",
+                 [](auto &va_view, auto &vb_view)
+                     SYCL_ESIMD_FUNCTION { va_view = vb_view; });
+  // move assignment operator copies the underlying data.
+  passed &= test(q, "move assignment operator",
+                 [](auto &va_view, auto &vb_view)
+                     SYCL_ESIMD_FUNCTION { va_view = std::move(vb_view); });
+
+  return passed ? 0 : 1;
+}