Merge pull request #15925 from alalek:core_test_simd_cpp_emulation

core(test): extending tests with SIMD C++ emulation code (intrin_cpp.hpp)

* core(test): test SIMD CPP emulation code (intrin_cpp.hpp)

* core(simd): eliminate build warnings from intrin_cpp.hpp

modules/core/include/opencv2/core/hal/intrin.hpp

@@ -143,6 +143,7 @@ CV_INTRIN_DEF_TYPE_TRAITS(double, int64, uint64, double, void, void, double, 2);
 
 #ifndef CV_DOXYGEN
 
+#ifndef CV_CPU_OPTIMIZATION_HAL_NAMESPACE
 #ifdef CV_CPU_DISPATCH_MODE
     #define CV_CPU_OPTIMIZATION_HAL_NAMESPACE __CV_CAT(hal_, CV_CPU_DISPATCH_MODE)
     #define CV_CPU_OPTIMIZATION_HAL_NAMESPACE_BEGIN namespace __CV_CAT(hal_, CV_CPU_DISPATCH_MODE) {
@@ -152,6 +153,7 @@ CV_INTRIN_DEF_TYPE_TRAITS(double, int64, uint64, double, void, void, double, 2);
     #define CV_CPU_OPTIMIZATION_HAL_NAMESPACE_BEGIN namespace hal_baseline {
     #define CV_CPU_OPTIMIZATION_HAL_NAMESPACE_END }
 #endif
+#endif // CV_CPU_OPTIMIZATION_HAL_NAMESPACE
 
 CV_CPU_OPTIMIZATION_HAL_NAMESPACE_BEGIN
 CV_CPU_OPTIMIZATION_HAL_NAMESPACE_END
@@ -168,29 +170,29 @@ using namespace CV_CPU_OPTIMIZATION_HAL_NAMESPACE;
 #   undef CV_MSA
 #endif
 
-#if CV_SSE2 || CV_NEON || CV_VSX || CV_MSA || CV_WASM_SIMD
+#if (CV_SSE2 || CV_NEON || CV_VSX || CV_MSA || CV_WASM_SIMD) && !defined(CV_FORCE_SIMD128_CPP)
 #define CV__SIMD_FORWARD 128
 #include "opencv2/core/hal/intrin_forward.hpp"
 #endif
 
-#if CV_SSE2
+#if CV_SSE2 && !defined(CV_FORCE_SIMD128_CPP)
 
 #include "opencv2/core/hal/intrin_sse_em.hpp"
 #include "opencv2/core/hal/intrin_sse.hpp"
 
-#elif CV_NEON
+#elif CV_NEON && !defined(CV_FORCE_SIMD128_CPP)
 
 #include "opencv2/core/hal/intrin_neon.hpp"
 
-#elif CV_VSX
+#elif CV_VSX && !defined(CV_FORCE_SIMD128_CPP)
 
 #include "opencv2/core/hal/intrin_vsx.hpp"
 
-#elif CV_MSA
+#elif CV_MSA && !defined(CV_FORCE_SIMD128_CPP)
 
 #include "opencv2/core/hal/intrin_msa.hpp"
 
-#elif CV_WASM_SIMD
+#elif CV_WASM_SIMD && !defined(CV_FORCE_SIMD128_CPP)
 #include "opencv2/core/hal/intrin_wasm.hpp"
 
 #else

modules/core/include/opencv2/core/hal/intrin_cpp.hpp

@@ -365,6 +365,13 @@ template<typename _Tp, int n> struct v_reg
         return c;
     }
 
+    v_reg& operator=(const v_reg<_Tp, n> & r)
+    {
+        for( int i = 0; i < n; i++ )
+            s[i] = r.s[i];
+        return *this;
+    }
+
     _Tp s[n];
 //! @endcond
 };
@@ -623,7 +630,7 @@ template<typename _Tp, int n>
 inline v_reg<typename V_TypeTraits<_Tp>::abs_type, n> v_popcount(const v_reg<_Tp, n>& a)
 {
     v_reg<typename V_TypeTraits<_Tp>::abs_type, n> b = v_reg<typename V_TypeTraits<_Tp>::abs_type, n>::zero();
-    for( int i = 0; i < n*sizeof(_Tp); i++ )
+    for (int i = 0; i < n*(int)sizeof(_Tp); i++)
         b.s[i/sizeof(_Tp)] += popCountTable[v_reinterpret_as_u8(a).s[i]];
     return b;
 }

modules/core/test/test_intrin.cpp

@@ -4,6 +4,19 @@
 #include "test_precomp.hpp"
 
 #include "test_intrin128.simd.hpp"
+
+// see "test_intrin_emulator.cpp"
+// see "opencv2/core/private/cv_cpu_include_simd_declarations.hpp"
+#define CV_CPU_OPTIMIZATION_DECLARATIONS_ONLY
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_END
+#define CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN namespace opt_EMULATOR_CPP {
+#define CV_CPU_OPTIMIZATION_NAMESPACE_END }
+#include "test_intrin128.simd.hpp"
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_END
+#undef CV_CPU_OPTIMIZATION_DECLARATIONS_ONLY
+
 #include "test_intrin128.simd_declarations.hpp"
 
 #undef CV_CPU_DISPATCH_MODES_ALL
@@ -22,6 +35,8 @@
 
 namespace opencv_test { namespace hal {
 
+#define CV_CPU_CALL_CPP_EMULATOR_(fn, args) return (opt_EMULATOR_CPP::fn args)
+
 #define CV_CPU_CALL_BASELINE_(fn, args)  CV_CPU_CALL_BASELINE(fn, args)
 
 #define DISPATCH_SIMD128(fn, cpu_opt) do { \
@@ -53,6 +68,8 @@ TEST(hal_intrin ## simd_size, float64x2_ ## cpu_opt) { DISPATCH_SIMD ## simd_siz
 
 namespace intrin128 {
 
+DEFINE_SIMD_TESTS(128, CPP_EMULATOR)
+
 DEFINE_SIMD_TESTS(128, BASELINE)
 
 #if defined CV_CPU_DISPATCH_COMPILE_SSE2 || defined CV_CPU_BASELINE_COMPILE_SSE2

modules/core/test/test_intrin_emulator.cpp

@@ -0,0 +1,24 @@
+// This file is part of OpenCV project.
+// It is subject to the license terms in the LICENSE file found in the top-level directory
+// of this distribution and at http://opencv.org/license.html.
+#include "test_precomp.hpp"
+
+// see "opencv2/core/hal/intrin.hpp"
+#define CV_CPU_OPTIMIZATION_HAL_NAMESPACE hal_EMULATOR_CPP
+#define CV_CPU_OPTIMIZATION_HAL_NAMESPACE_BEGIN namespace hal_EMULATOR_CPP {
+#define CV_CPU_OPTIMIZATION_HAL_NAMESPACE_END }
+
+// see "opencv2/core/private/cv_cpu_include_simd_declarations.hpp"
+//#define CV_CPU_OPTIMIZATION_DECLARATIONS_ONLY
+#define CV_FORCE_SIMD128_CPP
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_END
+#define CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN namespace opt_EMULATOR_CPP {
+#define CV_CPU_OPTIMIZATION_NAMESPACE_END }
+#include "test_intrin128.simd.hpp"
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_BEGIN
+#undef CV_CPU_OPTIMIZATION_NAMESPACE_END
+#undef CV_CPU_DISPATCH_MODE
+#undef CV_FORCE_SIMD128_CPP
+
+// tests implementation is in test_intrin_utils.hpp