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Here is an example from the MIPS port. It defines the following modes and attributes (among others):

     (define_mode_macro GPR [SI (DI "TARGET_64BIT")])
     (define_mode_attr d [(SI "") (DI "d")])

and uses the following template to define both subsi3 and subdi3:

     (define_insn "sub<mode>3"
       [(set (match_operand:GPR 0 "register_operand" "=d")
             (minus:GPR (match_operand:GPR 1 "register_operand" "d")
                        (match_operand:GPR 2 "register_operand" "d")))]
       [(set_attr "type" "arith")
        (set_attr "mode" "<MODE>")])

This is exactly equivalent to:

     (define_insn "subsi3"
       [(set (match_operand:SI 0 "register_operand" "=d")
             (minus:SI (match_operand:SI 1 "register_operand" "d")
                       (match_operand:SI 2 "register_operand" "d")))]
       [(set_attr "type" "arith")
        (set_attr "mode" "SI")])
     (define_insn "subdi3"
       [(set (match_operand:DI 0 "register_operand" "=d")
             (minus:DI (match_operand:DI 1 "register_operand" "d")
                       (match_operand:DI 2 "register_operand" "d")))]
       [(set_attr "type" "arith")
        (set_attr "mode" "DI")])