add static_buffer_v2 zero out

composable_kernel/include/tensor_operation/gridwise_gemm_xdlops_v2r3.hpp

@@ -518,6 +518,8 @@ struct GridwiseGemm_k0mk1_k0nk1_mn_xdlops_v2r3
         // main body
         index_t k0_block_data_begin = 0;
 
+        c_thread_buf.Clear();
+
         if constexpr(HasMainKBlockLoop)
         {
             do

composable_kernel/include/utility/static_buffer_of_vector_type_v2.hpp

@@ -22,6 +22,13 @@ struct StaticBufferOfVectorTypeV2 : public StaticallyIndexedArray<T, N>
 
     static constexpr index_t vector_size = GetVectorSize();
 
+    __host__ __device__ static constexpr index_t GetNumVectors() { return N; }
+
+    __host__ __device__ static constexpr index_t GetNumElements()
+    {
+        return GetVectorSize() * GetNumVectors();
+    }
+
     VecBaseType invalid_element_value_ = VecBaseType{0};
 
     T invalid_vec_value_ = T{0};
@@ -91,6 +98,12 @@ struct StaticBufferOfVectorTypeV2 : public StaticallyIndexedArray<T, N>
         return GetElement(i, true);
     }
 
+    __host__ __device__ void Clear()
+    {
+        static_for<0, GetNumElements(), 1>{}(
+            [&](auto i) { GetElement(i, true) = invalid_element_value_; });
+    }
+
     __host__ __device__ static constexpr bool IsStaticBuffer() { return true; }
 
     __host__ __device__ static constexpr bool IsDynamicBuffer() { return false; }