- Add MASM assembler files for MSVC x64 projects to support vm_x86 in x64 mode

- Clean up ftol()/snapvector() mess
- Make use of SSE instructions for ftol()/snapvector() if available
- move ftol/snapvector pure assembler to inline assembler, this will add x86_64 and improve support for different calling conventions
- Set FPU control word at program startup to get consistent behaviour on all platforms

code/sys/sys_unix.c

@@ -36,6 +36,7 @@ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 #include <pwd.h>
 #include <libgen.h>
 #include <fcntl.h>
+#include <fenv.h>
 
 qboolean stdinIsATTY;
 
@@ -125,31 +126,6 @@ int Sys_Milliseconds (void)
 	return curtime;
 }
 
-#if !id386
-/*
-==================
-fastftol
-==================
-*/
-long fastftol( float f )
-{
-	return (long)f;
-}
-
-/*
-==================
-Sys_SnapVector
-==================
-*/
-void Sys_SnapVector( float *v )
-{
-	v[0] = rint(v[0]);
-	v[1] = rint(v[1]);
-	v[2] = rint(v[2]);
-}
-#endif
-
-
 /*
 ==================
 Sys_RandomBytes
@@ -756,6 +732,12 @@ void Sys_GLimpInit( void )
 	// NOP
 }
 
+void Sys_SetFloatEnv(void)
+{
+	// rounding towards 0
+	fesetround(FE_TOWARDZERO);
+}
+
 /*
 ==============
 Sys_PlatformInit