8.6.1.1210 DMAX d-max DOUBLE
( d1 d2 -- d3 )
d3 is the greater of d1 and d2.
Testing:
T{ 1. 2. DMAX -> 2. }T
T{ 1. 0. DMAX -> 1. }T
T{ 1. -1. DMAX -> 1. }T
T{ 1. 1. DMAX -> 1. }T
T{ 0. 1. DMAX -> 1. }T
T{ 0. -1. DMAX -> 0. }T
T{ -1. 1. DMAX -> 1. }T
T{ -1. -2. DMAX -> -1. }T
T{ 1. 0. DMAX -> 1. }T
T{ 1. -1. DMAX -> 1. }T
T{ 1. 1. DMAX -> 1. }T
T{ 0. 1. DMAX -> 1. }T
T{ 0. -1. DMAX -> 0. }T
T{ -1. 1. DMAX -> 1. }T
T{ -1. -2. DMAX -> -1. }T
T{ MAX-2INT HI-2INT DMAX -> MAX-2INT }T
T{ MAX-2INT MIN-2INT DMAX -> MAX-2INT }T
T{ MIN-2INT MAX-2INT DMAX -> MAX-2INT }T
T{ MIN-2INT LO-2INT DMAX -> LO-2INT }T
T{ MAX-2INT 1. DMAX -> MAX-2INT }T
T{ MAX-2INT -1. DMAX -> MAX-2INT }T
T{ MIN-2INT 1. DMAX -> 1. }T
T{ MIN-2INT -1. DMAX -> -1. }T