#define MIN3( A, B, C ) MIN2( MIN2( A, B ), C )
#define MAX3( A, B, C ) MAX2( MAX2( A, B ), C )
+#define MIN4( A, B, C, D ) MIN2( MIN2( A, B ), MIN2(C, D) )
+#define MAX4( A, B, C, D ) MAX2( MAX2( A, B ), MIN2(C, D) )
+
/**
* Align a value, only works pot alignemnts.