enh: dynamically check the support of fma/avx/sse42/avx2 in cmake files.

cmake/cmake.define

@@ -123,21 +123,31 @@ ELSE ()
         SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Werror -Wno-literal-suffix -Werror=return-type -fPIC -gdwarf-2 -g3 -Wformat=2 -Wno-format-nonliteral -Wno-format-truncation -Wno-format-y2k")
     ENDIF ()
 
-    IF (TD_INTEL_64 OR TD_INTEL_32)
-        ADD_DEFINITIONS("-msse4.2")
-        IF("${FMA_SUPPORT}" MATCHES "true")
-            MESSAGE(STATUS "fma function supported")
-            ADD_DEFINITIONS("-mfma")
-        ELSE ()
-            MESSAGE(STATUS "fma function NOT supported")
+    INCLUDE(CheckCCompilerFlag)
+    CHECK_C_COMPILER_FLAG("-msse4.2" GCC_SUPPORT_SSE42)
+    CHECK_C_COMPILER_FLAG("-mfma" GCC_SUPPORT_FMA)
+    CHECK_C_COMPILER_FLAG("-mavx" GCC_SUPPORT_AVX)
+    CHECK_C_COMPILER_FLAG("-mavx2" GCC_SUPPORT_AVX2)
+
+    IF (GCC_SUPPORT_SSE42)
+        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -msse4.2")
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -msse4.2")
+    ENDIF()
+    IF (GCC_SUPPORT_FMA)
+        SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mfma")
+        SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mfma")
     ENDIF()
 
-        IF("${SIMD_SUPPORT}" MATCHES "true")
-            ADD_DEFINITIONS("-mavx -mavx2")
+    IF ("${SIMD_SUPPORT}" MATCHES "true")
+        IF (GCC_SUPPORT_AVX)
+            SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx")
+            SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx")
+        ENDIF()
+        IF (GCC_SUPPORT_AVX2)
+            SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -mavx2")
+            SET(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -mavx2")
+        ENDIF()
         MESSAGE(STATUS "SIMD instructions (AVX/AVX2) is ACTIVATED")
-        ELSE()
-            MESSAGE(STATUS "SIMD instruction (AVX/AVX2)is NOT ACTIVATED")
     ENDIF()
-    ENDIF ()
 
 ENDIF ()