SWDEV-541351 - fix use of uninitialized memory in Unit___hip_atomic_compare_exchange tests (#1976)

projects/hip-tests/catch/unit/atomics/memory_order_common.hh

@@ -217,6 +217,8 @@ template <BuiltinAtomicOperation operation, int memory_order, int memory_scope>
   SECTION("Global memory") {
     const auto alloc_type = LinearAllocs::hipMalloc;
     LinearAllocGuard<int> data(alloc_type, sizeof(int));
+
+    HIP_CHECK(hipMemset(data.ptr(), 0, sizeof(int)));
     TestKernel<operation, memory_order, memory_scope>
         <<<blocks, threads>>>(flag.ptr(), data.ptr(), ret.ptr());
   }
@@ -245,10 +247,14 @@ template <BuiltinAtomicOperation operation, int memory_order> void SystemTest()
   LinearAllocGuard<int> flag(LinearAllocs::hipMallocManaged, sizeof(int));
   LinearAllocGuard<int> ret(LinearAllocs::hipMallocManaged, sizeof(int));
 
+  HIP_CHECK(hipMemset(flag.ptr(), 0, sizeof(int)));
+
   SECTION("Global memory") {
     const auto alloc_type = GENERATE(LinearAllocs::hipHostMalloc , LinearAllocs::hipMallocManaged);
     LinearAllocGuard<int> data(alloc_type, sizeof(int));
 
+    HIP_CHECK(hipMemset(data.ptr(), 0, sizeof(int)));
+
     if constexpr(operation == BuiltinAtomicOperation::kAnd) {
       flag.ptr()[0] = 1;
     }
@@ -405,6 +411,9 @@ template <BuiltinAtomicOperation operation, int memory_scope> void Test() {
   LinearAllocGuard<int> counter1(LinearAllocs::hipMallocManaged, sizeof(int));
   LinearAllocGuard<int> counter2(LinearAllocs::hipMallocManaged, sizeof(int));
 
+  HIP_CHECK(hipMemset(counter1.ptr(), 0, sizeof(int)));
+  HIP_CHECK(hipMemset(counter2.ptr(), 0, sizeof(int)));
+
   SECTION("Global memory") {
     const auto alloc_type = LinearAllocs::hipMalloc;
     LinearAllocGuard<int> flag1(alloc_type, sizeof(int));
@@ -443,9 +452,11 @@ template <BuiltinAtomicOperation operation> void SystemTest() {
 
   LinearAllocGuard<int> counter1(LinearAllocs::hipMallocManaged, sizeof(int));
   LinearAllocGuard<int> counter2(LinearAllocs::hipMallocManaged, sizeof(int));
-
   std::vector<StreamGuard> streams;
 
+  HIP_CHECK(hipMemset(counter1.ptr(), 0, sizeof(int)));
+  HIP_CHECK(hipMemset(counter2.ptr(), 0, sizeof(int)));
+
   for (auto j = 0; j < 2; ++j) {
       streams.emplace_back(Streams::created);
   }