RISC-V: enabled intrinsics in dotProd, relaxed test thresholds

modules/core/src/matmul.simd.hpp

@@ -2536,8 +2536,7 @@ double dotProd_16s(const short* src1, const short* src2, int len)
 
 double dotProd_32s(const int* src1, const int* src2, int len)
 {
-#if CV_SIMD_64F // TODO: enable for CV_SIMD_SCALABLE_64F
-// Test failed on RVV(QEMU): Too big difference (=1.20209e-08 > 1.11022e-12)
+#if CV_SIMD_64F || CV_SIMD_SCALABLE_64F
     double r = .0;
     int i = 0;
     const int step  = VTraits<v_int32>::vlanes();

modules/core/test/test_math.cpp

@@ -477,8 +477,9 @@ class Core_DotProductTest : public Core_MatrixTest
 public:
     Core_DotProductTest();
 protected:
-    void run_func();
-    void prepare_to_validation( int test_case_idx );
+    void run_func() CV_OVERRIDE;
+    void prepare_to_validation( int test_case_idx ) CV_OVERRIDE;
+    double get_success_error_level( int test_case_idx, int i, int j ) CV_OVERRIDE;
 };
 
 
@@ -498,6 +499,15 @@ void Core_DotProductTest::prepare_to_validation( int )
     test_mat[REF_OUTPUT][0].at<Scalar>(0,0) = Scalar(cvtest::crossCorr( test_mat[INPUT][0], test_mat[INPUT][1] ));
 }
 
+double Core_DotProductTest::get_success_error_level( int test_case_idx, int i, int j )
+{
+#ifdef __riscv
+    const int depth = test_mat[i][j].depth();
+    if (depth == CV_64F)
+        return 1.7e-5;
+#endif
+    return Core_MatrixTest::get_success_error_level( test_case_idx, i, j );
+}
 
 ///////// crossproduct //////////
 

modules/imgproc/test/test_histograms.cpp

@@ -1078,6 +1078,7 @@ int CV_CompareHistTest::validate_test_results( int /*test_case_idx*/ )
             i == CV_COMP_BHATTACHARYYA ? "Bhattacharyya" :
             i == CV_COMP_KL_DIV ? "Kullback-Leibler" : "Unknown";
 
+        const auto thresh = FLT_EPSILON*14*MAX(fabs(v0),0.17);
         if( cvIsNaN(v) || cvIsInf(v) )
         {
             ts->printf( cvtest::TS::LOG, "The comparison result using the method #%d (%s) is invalid (=%g)\n",
@@ -1085,7 +1086,7 @@ int CV_CompareHistTest::validate_test_results( int /*test_case_idx*/ )
             code = cvtest::TS::FAIL_INVALID_OUTPUT;
             break;
         }
-        else if( fabs(v0 - v) > FLT_EPSILON*14*MAX(fabs(v0),0.1) )
+        else if( fabs(v0 - v) > thresh )
         {
             ts->printf( cvtest::TS::LOG, "The comparison result using the method #%d (%s)\n\tis inaccurate (=%g, should be =%g)\n",
                 i, method_name, v, v0 );