[SYCL][ESIMD] Add test for Atomic update fix

SYCL/ESIMD/regression/atomic_update_test.cpp

@@ -0,0 +1,46 @@
+//==---------------- atomic_update_test.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 test checks regression in lsc_atomic_update
+//===----------------------------------------------------------------------===//
+// REQUIRES: gpu-intel-pvc
+// RUN: %clangxx -fsycl %s -o %t.out
+// RUN: %GPU_RUN_PLACEHOLDER %t.out
+
+#include "../esimd_test_utils.hpp"
+
+#include <CL/sycl.hpp>
+#include <iostream>
+#include <sycl/ext/intel/esimd.hpp>
+
+int main() {
+  sycl::queue q{};
+  auto p_sync = malloc_shared<uint32_t>(1024, q);
+  p_sync[0] = 5;
+  p_sync[1] = 0;
+  q.submit([&](sycl::handler &cgh) {
+    cgh.single_task<class reproducer>([=]() [[intel::sycl_explicit_simd]] {
+      uint32_t result =
+          sycl::ext::intel::experimental::esimd::lsc_atomic_update<
+              sycl::ext::intel::esimd::atomic_op::load, uint32_t, 1>(p_sync, 0,
+                                                                     1)[0];
+      sycl::ext::intel::experimental::esimd::lsc_atomic_update<
+          sycl::ext::intel::esimd::atomic_op::store, uint32_t, 1>(p_sync, 1,
+                                                                  result, 1);
+    });
+  });
+  q.wait();
+
+  bool passed = true;
+
+  passed &= p_sync[0] == p_sync[1];
+
+  std::cout << (passed ? "Test passed\n" : "Test FAILED\n");
+
+  free(p_sync, q);
+  return passed ? 0 : 1;
+}