call based vs continuation based contification

[Stephen Weeks]

> Was the count-graphs case one where lifting the common calls was possible?

No.  This was the case with two tail calls from outside preventing a function
(x_1188) from being contified.  Here is the cps code.

fun x_1188(x_2277, x_2278) = 
   let
      val x_1191 = Int_add(x_2277, global_7)
   in
      loop_59(x_1191, x_2278)
   end
fun loop_59(x_1192, env_129) = 
   let
      val pState_0 = #1 env_129
      val connected_10 = #2 env_129
      val x_1194 = #3 env_129
      val first_0 = #4 env_129
      val x_1195 = #5 env_129
      val x_1196 = #6 env_129
      val x_1193 = MLton_eq(x_1192, pState_0)
      fun L_356() = 
	 let
	    fun L_769(x_2273, x_2274) = 
	       let
		  val x_1971 = Array_length(connected_10)
		  fun L_770() = 
		     let
			val x_1973 = Array_sub(connected_10, x_2274)
			val x_1974 = Array_length(x_1973)
			fun L_772() = 
			   let
			      val x_1975 = Array_sub(x_1973, x_2273)
			      val x_1200 = Array_length(x_1194)
			      fun L_360() = 
				 let
				    val x_1201 = Array_sub(x_1194, x_1192)
				    fun L_776(x_2275, x_2276) = 
				       let
					  val x_1979 = Array_length(connected_10)
					  fun L_777() = 
					     let
						val x_1981 = Array_sub(connected_10,
								       x_2276)
						val x_1982 = Array_length(x_1981)
						fun L_779() = 
						   let
						      val x_1983 = Array_sub(x_1981,
									     x_2275)
						      fun L_364() = 
							 let
							    fun L_367() = 
							       x_1188(x_1192,
								      env_129)
							    fun L_366() = 
							       raise [x_1195]
							 in
							    case x_1983 of
							      true => L_366
							    | _ => L_367
							 end
						      fun L_365() = 
							 let
							    fun L_369() = 
							       x_1188(x_1192,
								      env_129)
							    fun L_368() = 
							       let
								  val x_1205 = accross_0(x_1196)
							       in
								  raise [x_1205]
							       end
							 in
							    case x_1983 of
							      false => L_368
							    | _ => L_369
							 end
						   in
						      case x_1975 of
							false => L_364
						      | true => L_365
						   end
						fun L_780() = 
						   raise [global_80]
						val x_1980 = Int_geu(x_2275,
								     x_1982)
					     in
						case x_1980 of
						  true => L_780 | false => L_779
					     end
					  fun L_778() = 
					     raise [global_80]
					  val x_1978 = Int_geu(x_2276, x_1979)
				       in
					  case x_1978 of
					    true => L_778 | false => L_777
				       end
				    fun L_774() = 
				       L_776(first_0, x_1201)
				    fun L_775() = 
				       L_776(x_1201, first_0)
				    val x_1976 = Int_gt(first_0, x_1201)
				 in
				    case x_1976 of
				      true => L_775 | false => L_774
				 end
			      fun L_361() = 
				 raise [global_80]
			      val x_1199 = Int_geu(x_1192, x_1200)
			   in
			      case x_1199 of
				false => L_360 | true => L_361
			   end
			fun L_773() = 
			   raise [global_80]
			val x_1972 = Int_geu(x_2273, x_1974)
		     in
			case x_1972 of
			  true => L_773 | false => L_772
		     end
		  fun L_771() = 
		     raise [global_80]
		  val x_1970 = Int_geu(x_2274, x_1971)
	       in
		  case x_1970 of
		    true => L_771 | false => L_770
	       end
	    fun L_767() = 
	       L_769(pState_0, x_1192)
	    fun L_768() = 
	       L_769(x_1192, pState_0)
	    val x_1968 = Int_gt(pState_0, x_1192)
	 in
	    case x_1968 of
	      true => L_768 | false => L_767
	 end
      fun L_357() = 
	 let
	    val x_1989 = Array_length(x_1194)
	    fun L_781() = 
	       let
		  val x_1990 = Array_update(x_1194, pState_0, first_0)
		  val x_1210 = Int_add(pState_0, global_7)
	       in
		  x_1210
	       end
	    fun L_782() = 
	       raise [global_80]
	    val x_1988 = Int_geu(pState_0, x_1989)
	 in
	    case x_1988 of
	      true => L_782 | false => L_781
	 end
   in
      case x_1193 of
	false => L_356 | true => L_357
   end