-; lhs rhs result result also in
-; -------------------------------------------------------------
-; ptr1 ax ax:sreg ptr1:sreg
+; routine LHS RHS result result also in
+; -----------------------------------------------------------------------
+; umul16x16r32 ax ptr1 ax:sreg ptr1:sreg
+; umul16x16r32m ptr3 ptr1 ax:sreg ptr1:sreg
+; umul16x16r16 ax ptr1 ax ptr1
+; umul16x16r16m ptr3 ptr1 ax ptr1
+;
+; ptr3 is left intact by the routine.