Merge pull request #21119 from anna-khakimova:ak/simd_addc

* GAPI Fluid: SIMD for AddC kernel

* Final version

* Applied comments.

modules/gapi/perf/gpu/gapi_core_perf_tests_gpu.cpp

@@ -20,7 +20,8 @@ INSTANTIATE_TEST_CASE_P(AddPerfTestGPU, AddPerfTest,
                                 Values(cv::compile_args(CORE_GPU))));
 
 INSTANTIATE_TEST_CASE_P(AddCPerfTestGPU, AddCPerfTest,
-                        Combine(Values( szSmall128, szVGA, sz720p, sz1080p ),
+                        Combine(Values(AbsExact().to_compare_f()),
+                                Values( szSmall128, szVGA, sz720p, sz1080p ),
                                 Values( CV_8UC1, CV_8UC3, CV_16UC1, CV_16SC1, CV_32FC1 ),
                                 Values( -1, CV_8U, CV_16U, CV_32F ),
                                 Values(cv::compile_args(CORE_GPU))));