cmake: fix CPU_BASELINE_FINAL filling

- remove duplicates
- restore "always on" missing entries
- fix FP16 detection on MSVC

cmake/OpenCVCompilerOptimizations.cmake

@@ -234,6 +234,7 @@ if(X86 OR X86_64)
   elseif(MSVC)
     ocv_update(CPU_AVX2_FLAGS_ON "/arch:AVX2")
     ocv_update(CPU_AVX_FLAGS_ON "/arch:AVX")
+    ocv_update(CPU_FP16_FLAGS_ON "/arch:AVX")
     if(NOT MSVC64)
       # 64-bit MSVC compiler uses SSE/SSE2 by default
       ocv_update(CPU_SSE_FLAGS_ON "/arch:SSE")
@@ -422,6 +423,9 @@ foreach(OPT ${CPU_KNOWN_OPTIMIZATIONS})
   if(__is_disabled)
     set(__is_from_baseline 0)
   else()
+    if(CPU_${OPT}_SUPPORTED AND CPU_BASELINE_DETECT)
+      list(APPEND CPU_BASELINE_FINAL ${OPT})
+    endif()
     ocv_is_optimization_in_list(__is_from_baseline ${OPT} ${CPU_BASELINE_REQUIRE})
     if(NOT __is_from_baseline)
       ocv_is_optimization_in_list(__is_from_baseline ${OPT} ${CPU_BASELINE})
@@ -441,7 +445,9 @@ foreach(OPT ${CPU_KNOWN_OPTIMIZATIONS})
     if(";${CPU_DISPATCH};" MATCHES ";${OPT};" AND NOT __is_from_baseline)
       list(APPEND CPU_DISPATCH_FINAL ${OPT})
     elseif(__is_from_baseline)
+      if(NOT ";${CPU_BASELINE_FINAL};" MATCHES ";${OPT};")
         list(APPEND CPU_BASELINE_FINAL ${OPT})
+      endif()
       ocv_append_optimization_flag(CPU_BASELINE_FLAGS ${OPT})
     endif()
   endif()

cmake/checks/cpu_fp16.cpp

 #include <stdio.h>
 
-#if defined __F16C__ || (defined _MSC_VER && _MSC_VER >= 1700) || (defined __INTEL_COMPILER && defined __AVX__)
+#if defined __F16C__ || (defined _MSC_VER && _MSC_VER >= 1700 && defined __AVX__) || (defined __INTEL_COMPILER && defined __AVX__)
 #include <immintrin.h>
 int test()
 {