Fix Visual Studio builds

Have Visual Studio use MemoryBarrier() instead of _mm_mfence() and remove
__declspec align attribute from function parameters in kmp_atomic.h

llvm-svn: 264166

openmp/runtime/src/kmp_atomic.h

@@ -35,6 +35,13 @@
 #if defined( __cplusplus ) && ( KMP_OS_WINDOWS )
     // create shortcuts for c99 complex types
 
+    // Visual Studio cannot have function parameters that have the
+    // align __declspec attribute, so we must remove it. (Compiler Error C2719)
+    #if KMP_COMPILER_MSVC
+    # undef KMP_DO_ALIGN
+    # define KMP_DO_ALIGN(alignment) /* Nothing */
+    #endif
+
     #if (_MSC_VER < 1600) && defined(_DEBUG)
         // Workaround for the problem of _DebugHeapTag unresolved external.
         // This problem prevented to use our static debug library for C tests

openmp/runtime/src/kmp_csupport.c

@@ -654,8 +654,10 @@ __kmpc_flush(ident_t *loc)
             if ( ! __kmp_cpuinfo.sse2 ) {
                 // CPU cannot execute SSE2 instructions.
             } else {
-                #if KMP_COMPILER_ICC || KMP_COMPILER_MSVC
+                #if KMP_COMPILER_ICC 
                 _mm_mfence();
+                #elif KMP_COMPILER_MSVC
+                MemoryBarrier();
                 #else
                 __sync_synchronize();
                 #endif // KMP_COMPILER_ICC