Modifications to support dynamic vector dispatch.

modules/core/doc/utility_and_system_functions_and_macros.rst

@@ -317,6 +317,7 @@ Returns true if the specified feature is supported by the host hardware.
                         * ``CV_CPU_SSE4_2`` - SSE 4.2
                         * ``CV_CPU_POPCNT`` - POPCOUNT
                         * ``CV_CPU_AVX`` - AVX
+                        * ``CV_CPU_AVX2`` - AVX2
 
 The function returns true if the host hardware supports the specified feature. When user calls ``setUseOptimized(false)``, the subsequent calls to ``checkHardwareSupport()`` will return false until ``setUseOptimized(true)`` is called. This way user can dynamically switch on and off the optimized code in OpenCV.
 

modules/core/include/opencv2/core/core.hpp

@@ -284,6 +284,7 @@ CV_EXPORTS_W int64 getCPUTickCount();
   - CV_CPU_SSE4_2 - SSE 4.2
   - CV_CPU_POPCNT - POPCOUNT
   - CV_CPU_AVX - AVX
+  - CV_CPU_AVX2 - AVX2
 
   \note {Note that the function output is not static. Once you called cv::useOptimized(false),
   most of the hardware acceleration is disabled and thus the function will returns false,

modules/core/src/system.cpp

@@ -253,7 +253,6 @@ struct HWFeatures
             f.have[CV_CPU_AVX]    = (((cpuid_data[2] & (1<<28)) != 0)&&((cpuid_data[2] & (1<<27)) != 0));//OS uses XSAVE_XRSTORE and CPU support AVX
         }
 
-#if CV_AVX2
     #if defined _MSC_VER && (defined _M_IX86 || defined _M_X64)
         __cpuidex(cpuid_data, 7, 0);
     #elif defined __GNUC__ && (defined __i386__ || defined __x86_64__)
@@ -286,7 +285,6 @@ struct HWFeatures
         {
             f.have[CV_CPU_AVX2] = (cpuid_data[1] & (1<<5)) != 0;
         }
-#endif
 
         return f;
     }