Mine

O2000 sub
(subroutine to rough and finish mill a profile)
(assumes profile goes in the +Y direction from the start point)
(uses climb milling)
(arguments)
(#1 = x start point)
(#2 = y start point)
(#3 = O-number of subroutine with profile)
(#4 = start Z level)
(#5 = finish Z level)
(#6 = tool diameter)
(#7 = roughing feed)
(#8 = roughing depth per pass)
(#9 = finish feed)
(#10 = finish pass width)
(#11 = diameter of area available for ramp-down)
(note: #11 must be bigger than #6 + 4 * #10)

(internal variables)
(#20 = current z value)

O2001 if [#5 GT #4]
  (DEBUG, Finish Z <#5> is above start Z <#4>)
  M2
O2001 endif
O2002 if [#11 LE #6+4*#10]
  (DEBUG, ramp down area too small, use a smaller tool?)
  M2
O2002 endif
(negative value would make infinite loop)
#8 = [ABS[#8]]
(don't want comp on at this point)
G40
(initial Z - in the clear)
#20 = [#4+#8]
(go to starting location)
G0X[#1-#11/2]Y[#2-#11/2]Z#20
(turn on comp - oversize tool for roughing)
G41.1D[#6+2*#10]
(arc move to get comp started - still at safe height)
G3F#7I0J[#11/2]X#1Y#2
(calc new Z)
#20 = [#20-#8]
(roughing loop)
O2003 while [#20 GT #5]
  (helical ramp down)
  G3I[0-#11/2]J0X#1Y#2Z#20
  (mill profile)
  O[#3] call
  #20 = [#20-#8]
O2003 endwhile
(final helical ramp to the proper depth)
#20 = #5
G3I[0-#11/2]J0X#1Y#2Z#20
(mill profile at final depth)
O#3 call
(arc out)
G3I[0-#11/2]J0X[#1-#11/2]Y[#2+#11/2]
(up to clear material)
G0Z[#4+#8]
(comp off)
G40
(go to starting point for finish pass)
G0X[#1-#11/2]Y[#2-#11/2]
(turn on comp - finish tool size)
G41.1D[#6]
(arc to profile start point at safe height)
G3F#9I0J[#11/2]X#1Y#2
(helical ramp down to finish depth)
G3I[0-#11/2]J0X#1Y#2Z#5
(mill profile)
O[#3] call
(arc out)
G3I[0-#11/2]J0X[#1-#11/2]Y[#2+#11/2]
(comp off)
G40
(this should result in no net movement)
(since it moves by exactly the tool radius)
G0X[#1-#11/2]Y[#2+#11/2-#6/2]
(get up out of the hole)
G0Z[#4+#8]
O2000 endsub