Add MKL support

CMakeLists.txt

@@ -224,7 +224,7 @@ OCV_OPTION(WITH_VA             "Include VA support"                          OFF
 OCV_OPTION(WITH_VA_INTEL       "Include Intel VA-API/OpenCL support"         OFF  IF (UNIX AND NOT ANDROID) )
 OCV_OPTION(WITH_GDAL           "Include GDAL Support"                        OFF  IF (NOT ANDROID AND NOT IOS AND NOT WINRT) )
 OCV_OPTION(WITH_GPHOTO2        "Include gPhoto2 library support"             ON   IF (UNIX AND NOT ANDROID) )
-OCV_OPTION(WITH_LAPACK         "Include Lapack library support"              ON   IF (UNIX AND NOT ANDROID) )
+OCV_OPTION(WITH_LAPACK         "Include Lapack library support"              ON   IF (NOT ANDROID) )
 
 # OpenCV build components
 # ===================================================

cmake/OpenCVFindLibsPerf.cmake

@@ -7,11 +7,21 @@ if(WITH_LAPACK)
   find_package(LAPACK)
   if(LAPACK_FOUND)
     find_path(LAPACKE_INCLUDE_DIR "lapacke.h")
-    if(LAPACKE_INCLUDE_DIR)
+    find_path(MKL_LAPACKE_INCLUDE_DIR "mkl_lapack.h")
+    if(LAPACKE_INCLUDE_DIR OR MKL_LAPACKE_INCLUDE_DIR)
       find_path(CBLAS_INCLUDE_DIR "cblas.h")
-      if(CBLAS_INCLUDE_DIR)
+      find_path(MKL_CBLAS_INCLUDE_DIR "mkl_cblas.h")
+
+      if(CBLAS_INCLUDE_DIR OR MKL_CBLAS_INCLUDE_DIR)
         set(HAVE_LAPACK 1)
+
+      if(CBLAS_INCLUDE_DIR)
         ocv_include_directories(${LAPACKE_INCLUDE_DIR} ${CBLAS_INCLUDE_DIR})
+        set(HAVE_LAPACK_GENERIC 1)
+      elseif(MKL_CBLAS_INCLUDE_DIR)
+        ocv_include_directories(${MKL_LAPACKE_INCLUDE_DIR} ${MKL_CBLAS_INCLUDE_DIR})
+        set(HAVE_LAPACK_MKL 1)
+      endif()
         list(APPEND OPENCV_LINKER_LIBS ${LAPACK_LIBRARIES})
       endif()
     endif()

cmake/templates/cvconfig.h.in

@@ -204,5 +204,11 @@
 /* Lapack */
 #cmakedefine HAVE_LAPACK
 
+/* Lapack Generic */
+#cmakedefine HAVE_LAPACK_GENERIC
+
+/* Lapack MKL */
+#cmakedefine HAVE_LAPACK_MKL
+
 /* FP16 */
 #cmakedefine HAVE_FP16

modules/core/src/hal_internal.cpp

@@ -46,9 +46,17 @@
 
 #ifdef HAVE_LAPACK
 
+#ifdef HAVE_LAPACK_MKL
+  #include <mkl_cblas.h>
+  #include <mkl_lapack.h>
+#endif
+
+#ifdef HAVE_LAPACK_GENERIC
+  #include <lapacke.h>
+  #include <cblas.h>
+#endif
+
 #include <cmath>
-#include <lapacke.h>
-#include <cblas.h>
 #include <algorithm>
 #include <typeinfo>
 #include <limits>
@@ -150,7 +158,7 @@ lapack_LU(fptype* a, size_t a_step, int m, fptype* b, size_t b_step, int n, int*
 template <typename fptype> static inline int
 lapack_Cholesky(fptype* a, size_t a_step, int m, fptype* b, size_t b_step, int n, bool* info)
 {
-    int lapackStatus;
+    int lapackStatus = 0;
     int lda = a_step / sizeof(fptype);
     char L[] = {'L', '\0'};
 
@@ -227,7 +235,7 @@ lapack_SVD(fptype* a, size_t a_step, fptype *w, fptype* u, size_t u_step, fptype
     else if(typeid(fptype) == typeid(double))
         dgesdd_(mode, &m, &n, (double*)a, &lda, (double*)w, (double*)u, &ldu, (double*)vt, &ldv, (double*)&work1, &lwork, iworkBuf, info);
 
-    lwork = round(work1); //optimal buffer size
+    lwork = (int)round(work1); //optimal buffer size
     fptype* buffer = new fptype[lwork + 1];
 
     if(typeid(fptype) == typeid(float))