[CPU] Single place to fill tails of load emitter (#14846)

src/plugins/intel_cpu/src/emitters/jit_load_store_emitters.cpp

@@ -150,6 +150,11 @@ void jit_load_emitter::emit_isa(const Xbyak::Reg64 &reg_src, const int out_vec_i
                 break;
         }
     }
+
+    if (is_fill_) {
+        int dword_num_loaded = (src_prc_ != dst_prc_) ? load_num_ : (load_size_ / sizeof(float));
+        fill_with_default(Vmm(out_vec_idx), fill_value_, dword_num_loaded);
+    }
 }
 
 /**
@@ -313,9 +318,6 @@ void jit_load_emitter::load_bytes(const Vmm &vmm, const Xbyak::Reg64 &reg, int o
             break;
         }
     }
-
-    if (is_fill_)
-        fill_with_default(vmm, fill_value_, load_size / 4);
 }
 
 /**
@@ -407,9 +409,6 @@ void jit_load_emitter::load_bytes_to_dword_extension(const Vmm &vmm, const Xbyak
             break;
         }
     }
-
-    if (is_fill_)
-        fill_with_default(vmm, fill_value_, load_size);
 }
 
 /**
@@ -524,9 +523,6 @@ void jit_load_emitter::load_words_to_dword_extension(const Vmm &vmm, const Xbyak
             break;
         }
     }
-
-    if (is_fill_)
-        fill_with_default(vmm, fill_value_, load_size / 2);
 }
 
 template <typename Vmm>

src/plugins/intel_cpu/tests/functional/single_layer_tests/mvn.cpp

@@ -414,6 +414,29 @@ const auto Mvn2DTrans = ::testing::Combine(
 
 INSTANTIATE_TEST_SUITE_P(smoke_CompareWithRefs_Mvn2DTrans, MvnLayerCPUTest, Mvn2DTrans, MvnLayerCPUTest::getTestCaseName);
 
+// no transformed with small spatial dim and i8 data and no fusion to cover model use case
+const std::vector<InputShape> inputShapesSmallSpatial = {
+       { {}, {{4, 1}}},
+       { {}, {{2, 2}}},
+       { {}, {{1, 2, 1}}},
+       { {}, {{3, 1, 1, 1}}},
+};
+
+const auto MvnSmallSpatial = ::testing::Combine(
+       ::testing::Combine(
+               ::testing::ValuesIn(inputShapesSmallSpatial),
+               ::testing::Values(ElementType::i8),
+               ::testing::ValuesIn(emptyReductionAxes),
+               ::testing::Values(false),
+               ::testing::Values(false),
+               ::testing::ValuesIn(epsilon)),
+       ::testing::Values(emptyCPUSpec),
+       ::testing::Values(emptyFusingSpec),
+       ::testing::Values(ElementType::i8),
+       ::testing::Values(ElementType::f32));
+
+INSTANTIATE_TEST_SUITE_P(smoke_CompareWithRefs_MvnSmallSpatial, MvnLayerCPUTest, MvnSmallSpatial, MvnLayerCPUTest::getTestCaseName);
+
 // Static shape test for some specific fusing parameters in fusingParamsSetStaticShape
 
 const std::vector<ov::Shape> inputShapesStatic_2D = {