The function pow(2.0,i) has been replaced by (1<<i)

	modified:   modules/line_descriptor/perf/perf_matching.cpp
	modified:   modules/line_descriptor/test/test_matcher_regression.cpp

modules/line_descriptor/perf/perf_matching.cpp

@@ -101,7 +101,7 @@ uchar invertSingleBits( uchar dividend_char, int numBits )
   /* reconvert to decimal */
   uchar result = 0;
   for ( int i = (int) bin_vector.size() - 1; i >= 0; i-- )
-    result += (uchar) ( bin_vector[i] * pow( 2.0, i ) );
+    result += (uchar) ( bin_vector[i] * ( 1 << i ) );
 
   return result;
 }

modules/line_descriptor/test/test_matcher_regression.cpp

@@ -123,7 +123,7 @@ uchar CV_BinaryDescriptorMatcherTest::invertSingleBits( uchar dividend_char, int
   /* reconvert to decimal */
   uchar result = 0;
   for ( int i = (int) bin_vector.size() - 1; i >= 0; i-- )
-    result += (uchar) ( bin_vector[i] * pow( 2.0, i ) );
+    result += (uchar) ( bin_vector[i] * ( 1 << i ) );
 
   return result;
 }