Add strings to type system and parser/lexer

[snipe.git] / codegen / codegen.sml

diff --git a/codegen/codegen.sml b/codegen/codegen.sml
index 18ac4af84e7a7f859412ae9f9acba524b895809d..de8fa1e7867f5fcc851a1bfb924bb9975ef31c4e 100644 (file)
--- a/codegen/codegen.sml
+++ b/codegen/codegen.sml
@@ -6,90 +6,82 @@
 
 signature CODEGEN =
 sig
 
 signature CODEGEN =
 sig

-  val codegen : Tree.stm list -> x86.insn list
+  val codegen : Tree.stm list -> Blarg.insn list

 end
 
 structure Codegen :> CODEGEN = 
 struct
   structure T = Tree
   structure TU = TreeUtils
 end
 
 structure Codegen :> CODEGEN = 
 struct
   structure T = Tree
   structure TU = TreeUtils

-  structure X = x86
+  structure X = Blarg

   structure Tm = Temp
 
   (* hasfixed : T.exp -> bool
    * true iff the given expression has an hasfixed.
    *)
   structure Tm = Temp
 
   (* hasfixed : T.exp -> bool
    * true iff the given expression has an hasfixed.
    *)

-  fun hasfixed (T.BINOP(T.DIV, _, _)) = true
-    | hasfixed (T.BINOP(T.MOD, _, _)) = true
-    | hasfixed (T.BINOP(T.LSH, _, _)) = true
-    | hasfixed (T.BINOP(T.RSH, _, _)) = true
-    | hasfixed (T.CALL _) = true
+  fun hasfixed (T.CALL _) = true

     | hasfixed (T.BINOP(_, a, b)) = (hasfixed a) orelse (hasfixed b)
     | hasfixed (T.UNOP (_, a)) = hasfixed a
     | hasfixed (T.ALLOC(_)) = true
     | hasfixed (T.BINOP(_, a, b)) = (hasfixed a) orelse (hasfixed b)
     | hasfixed (T.UNOP (_, a)) = hasfixed a
     | hasfixed (T.ALLOC(_)) = true

-    | hasfixed (T.MEMORY (m,s)) = hasfixed m
+    | hasfixed (T.MEMORY (m)) = hasfixed m

     | hasfixed (T.STMVAR _) = true
     | hasfixed _ = false
 
     | hasfixed (T.STMVAR _) = true
     | hasfixed _ = false
 

-  fun offshit a b 0w4 d = [X.LEA(d, (X.REL((a, Tm.Quad), (b, Tm.Quad), 0w4), Tm.Quad))]
-    | offshit a b 0w8 d = [X.LEA(d, (X.REL((a, Tm.Quad), (b, Tm.Quad), 0w8), Tm.Quad))]
-    | offshit a b n d   = [X.IMUL((b, Tm.Long), (X.CONST n, Tm.Long)), X.MOV(d, (a, Tm.Quad)), X.ADD(d, (b, Tm.Quad))]
-
-  fun binophit_c d oper e c = let val (i, s) = munch_exp d e in (i @ [oper ((d,s), (X.CONST c, s))], s) end
-  and binophit_t d oper e t =
-    let
-      val (i, s) = munch_exp d e
-      val ts = Tm.size t
-      val rs = if Tm.cmpsize (s, ts) = GREATER then s else ts
-    in
-      (i @ [oper ((d, rs), (X.TEMP t, rs))], rs)
-    end
-  and binophit d oper e1 e2 =
+  (* binophit : X.oper -> X.opc -> T.exp -> T.exp -> X.insn list *)
+  (* binophit d oper e1 e2
+   * generates instructions to achieve d <- e1 oper e2
+   * oper should be something like X.ADD
+   *)
+  fun binophit d oper e1 e2 =

     let
     let

-      val t = X.TEMP (Tm.new "add" Tm.Long)
-      val (i1, s1) = munch_exp d e1
-      val (i2, s2) = munch_exp t e2
+      val t = X.TEMP (Tm.new "binop")
+      val i1 = munch_exp d e1
+      val i2 = munch_exp t e2

 (*      val _ = print ("s1 = " ^ Tm.sfx s1 ^ ", s2 = " ^ Tm.sfx s2 ^ ", ") *)
 (*      val _ = print ("s1 = " ^ Tm.sfx s1 ^ ", s2 = " ^ Tm.sfx s2 ^ ", ") *)

-      val rs = if Tm.cmpsize (s1, s2) = GREATER then s1 else s2

 (*      val _ = print ("rs = " ^ Tm.sfx rs ^ " from " ^ TU.Print.pp_exp e1 ^ " and " ^ TU.Print.pp_exp e2 ^ "\n") *)
     in
 (*      val _ = print ("rs = " ^ Tm.sfx rs ^ " from " ^ TU.Print.pp_exp e1 ^ " and " ^ TU.Print.pp_exp e2 ^ "\n") *)
     in

-      (i1 @ i2 @ [oper ((d,rs), (t,rs))], rs)
+      [X.COMMENT "binophit" ] @ i1 @ i2 @ [X.INSN (X.AL, oper (d, t)), X.COMMENT "binophit done"]
+    end
+  
+  (* cmphit : X.oper -> X.exp -> X.insn list
+   * cmphit d ex 
+   * generates instructions to set d based on the truth value of ex
+   *)
+  and cmphit d ex =
+    let
+      val (insns, pos, neg) = munch_cond ex
+    in 
+      insns @ [X.INSN (X.AL, X.MOVLIT (d, 0w0)), X.INSN (pos, X.MOVLIT (d, 0w1))]

     end
     end

-  and cmphit d a = let val (insns, pos, neg) = munch_cond a in (insns @ [X.SETcc (pos, (d, Tm.Byte)), X.MOVZB((d, Tm.Long), (d, Tm.Byte))], Tm.Long) end

 
   (* munch_exp : prex86oper -> T.exp -> prex86insn list *)
   (* munch_exp d e
    * generates instructions to achieve d <- e
    * d must be TEMP(t) or REG(r)
    *)
 
   (* munch_exp : prex86oper -> T.exp -> prex86insn list *)
   (* munch_exp d e
    * generates instructions to achieve d <- e
    * d must be TEMP(t) or REG(r)
    *)

-  and munch_exp d (T.CONST n) = ([X.MOV((d, Tm.Long), (X.CONST n, Tm.Long))], Tm.Long)
-    | munch_exp d (T.NULLPTR) = ([X.MOV((d, Tm.Quad), (X.CONST 0w0, Tm.Quad))], Tm.Quad)
-    | munch_exp d (T.TEMP(t)) = ([X.MOV((d, Tm.size t), (X.TEMP t, Tm.size t))], Tm.size t)
-    | munch_exp d (T.ARG(0, sz)) = ([X.MOV((d, sz), (X.REG X.EDI, sz))], sz)
-    | munch_exp d (T.ARG(1, sz)) = ([X.MOV((d, sz), (X.REG X.ESI, sz))], sz)
-    | munch_exp d (T.ARG(2, sz)) = ([X.MOV((d, sz), (X.REG X.EDX, sz))], sz)
-    | munch_exp d (T.ARG(3, sz)) = ([X.MOV((d, sz), (X.REG X.ECX, sz))], sz)
-    | munch_exp d (T.ARG(4, sz)) = ([X.MOV((d, sz), (X.REG X.R8D, sz))], sz)
-    | munch_exp d (T.ARG(5, sz)) = ([X.MOV((d, sz), (X.REG X.R9D, sz))], sz)
-    | munch_exp d (T.ARG(t, sz)) = ([X.MOV((d, sz), (X.STACKARG (t - 6), sz))], sz)
-    | munch_exp d (T.CALL(name, l, rsz)) = (* Scary demons live here. *)
+  and munch_exp d (T.CONST n) = [X.INSN (X.AL, X.MOVLIT(d, Word.fromLarge n))]
+    | munch_exp d (T.NULLPTR) = [X.INSN (X.AL, X.MOVLIT(d, 0w0))]
+    | munch_exp d (T.TEMP(t)) = [X.INSN (X.AL, X.MOV(d, X.TEMP t))]
+    | munch_exp d (T.ARG(0)) = [X.INSN (X.AL, X.MOV(d, X.REG X.R0))]
+    | munch_exp d (T.ARG(1)) = [X.INSN (X.AL, X.MOV(d, X.REG X.R1))]
+    | munch_exp d (T.ARG(2)) = [X.INSN (X.AL, X.MOV(d, X.REG X.R2))]
+    | munch_exp d (T.ARG(3)) = [X.INSN (X.AL, X.MOV(d, X.REG X.R3))]
+    | munch_exp d (T.ARG(t)) = [X.INSN (X.AL, X.MOV(d, X.STACKARG (t - 4)))]
+    | munch_exp d (T.CALL(name, l)) = (* Scary demons live here. *)

         let
           val nargs = length l
         let
           val nargs = length l

-          val nstack = if (nargs <= 6)
+          val nstack = if (nargs <= 4)

                        then 0
                        then 0

-                       else nargs - 6
-          val stackb = nstack * 8
-          fun argdest 1 = X.REG X.EDI
-            | argdest 2 = X.REG X.ESI
-            | argdest 3 = X.REG X.EDX
-            | argdest 4 = X.REG X.ECX
-            | argdest 5 = X.REG X.R8D
-            | argdest 6 = X.REG X.R9D
-            | argdest n = X.REL ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt (~(stackb - 8 * (n - 7)))), Tm.Quad), 0w1)
+                       else nargs - 4
+          val stackb = nstack * 1
+          fun argdest 1 = X.REG X.R0
+            | argdest 2 = X.REG X.R1
+            | argdest 3 = X.REG X.R2
+            | argdest 4 = X.REG X.R3
+            | argdest n = raise ErrorMsg.InternalError "more than 4 args not supported yet" (*X.REL ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt (~(stackb - 8 * (n - 7)))), Tm.Quad), 0w1)*)

 
           val dests = List.tabulate (nargs, fn x => argdest (x+1))
 
           val dests = List.tabulate (nargs, fn x => argdest (x+1))

-          val (exps,_) = ListPair.unzip l
-          val hf = List.map hasfixed exps
+          val hf = List.map hasfixed l

           val (d_hf, l_hf) = ListPair.unzip (ListPair.foldr
             (fn (a,b,c) => if b then a::c else c)
             nil
           val (d_hf, l_hf) = ListPair.unzip (ListPair.foldr
             (fn (a,b,c) => if b then a::c else c)
             nil


@@ -100,132 +92,78 @@ struct
             nil
             (ListPair.zip (dests,l), hf)
           )
             nil
             (ListPair.zip (dests,l), hf)
           )

-          val temps = List.map (fn (_, sz) => Temp.new ("arg") sz (* xxx? *)) l_hf
-          val (argevals_hf,_) = ListPair.unzip (List.map
-            (fn (t,(exp,_)) => munch_exp (X.TEMP t) exp)
-            (ListPair.zip (temps, l_hf)))
+          val temps = List.map (fn _ => Temp.new ("arg")) l_hf
+          val argevals_hf = List.map
+            (fn (t,exp) => munch_exp (X.TEMP t) exp)
+            (ListPair.zip (temps, l_hf))

           val argpushes = List.map
           val argpushes = List.map

-            (fn (dest, t) => [X.MOV ((dest, Tm.size t), (X.TEMP t, Tm.size t))])
+            (fn (dest, t) => [X.INSN (X.AL, X.MOV (dest, X.TEMP t))])

             (ListPair.zip (d_hf, temps))
             (ListPair.zip (d_hf, temps))

-          val (argevals_nohf,_) = ListPair.unzip (List.map
-            (fn (d,(exp,sz)) => munch_exp d exp)
-            (ListPair.zip (d_nohf, l_nohf)))
+          val argevals_nohf = List.map
+            (fn (d,exp) => munch_exp d exp)
+            (ListPair.zip (d_nohf, l_nohf))
+          
+          val t_stackb = Temp.new ("stackb")
+          val t_target = Temp.new ("target")

         in
         in

-          (List.concat argevals_hf @ 
-           List.concat argpushes @
-           List.concat argevals_nohf @
-           [ X.SUB ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stackb), Tm.Quad)),
-             X.CALL (name, nargs),
-             X.ADD ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stackb), Tm.Quad)),
-             X.MOV ((d, rsz), (X.REG X.EAX, rsz))], rsz)      (* Finally! *)
+          List.concat argevals_hf @ 
+          List.concat argpushes @
+          List.concat argevals_nohf @
+          [ X.INSN (X.AL, X.MOVLIT (X.TEMP t_stackb, Word.fromInt stackb)),
+            X.INSN (X.AL, X.MOVSYM (X.TEMP t_target, name)),
+            X.INSN (X.AL, X.SUB (X.REG X.SP, X.TEMP t_stackb)),
+            X.INSN (X.AL, X.CALL (X.REG X.SP, X.TEMP t_target, nargs)),
+            X.INSN (X.AL, X.ADD (X.REG X.SP, X.TEMP t_stackb)),
+            X.INSN (X.AL, X.MOV (d, X.REG X.R0))]

         end
         end

-    | munch_exp d (T.BINOP(T.ADD, e1, T.CONST n)) = binophit_c d X.ADD e1 n
+    (*| munch_exp d (T.BINOP(T.ADD, e1, T.CONST n)) = binophit_c d X.ADD e1 n

     | munch_exp d (T.BINOP(T.ADD, T.CONST n, e1)) = binophit_c d X.ADD e1 n
     | munch_exp d (T.BINOP(T.ADD, e1, T.TEMP t)) = binophit_t d X.ADD e1 t
     | munch_exp d (T.BINOP(T.ADD, T.CONST n, e1)) = binophit_c d X.ADD e1 n
     | munch_exp d (T.BINOP(T.ADD, e1, T.TEMP t)) = binophit_t d X.ADD e1 t

-    | munch_exp d (T.BINOP(T.ADD, T.TEMP t, e1)) = binophit_t d X.ADD e1 t
+    | munch_exp d (T.BINOP(T.ADD, T.TEMP t, e1)) = binophit_t d X.ADD e1 t*)

     | munch_exp d (T.BINOP(T.ADD, e1, e2)) = binophit d X.ADD e1 e2
 
     | munch_exp d (T.BINOP(T.ADD, e1, e2)) = binophit d X.ADD e1 e2
 

-    | munch_exp d (T.BINOP(T.SUB, e1, T.CONST n)) = binophit_c d X.SUB e1 n
-    | munch_exp d (T.BINOP(T.SUB, e1, T.TEMP t)) = binophit_t d X.SUB e1 t
+    (*| munch_exp d (T.BINOP(T.SUB, e1, T.CONST n)) = binophit_c d X.SUB e1 n
+    | munch_exp d (T.BINOP(T.SUB, e1, T.TEMP t)) = binophit_t d X.SUB e1 t*)

     | munch_exp d (T.BINOP(T.SUB, e1, e2)) = binophit d X.SUB e1 e2
     | munch_exp d (T.BINOP(T.SUB, e1, e2)) = binophit d X.SUB e1 e2

-    | munch_exp d (T.BINOP(T.MUL, T.TEMP t, T.CONST n)) = let val s = Tm.size t in ([X.IMUL3((d,s), (X.TEMP t,s), n)], Tm.size t) end
-    | munch_exp d (T.BINOP(T.MUL, T.CONST n, T.TEMP t)) = let val s = Tm.size t in ([X.IMUL3((d,s), (X.TEMP t,s), n)], Tm.size t) end
-    | munch_exp d (T.BINOP(T.MUL, e1, T.CONST n)) = binophit_c d X.IMUL e1 n
-    | munch_exp d (T.BINOP(T.MUL, T.CONST n, e1)) = binophit_c d X.IMUL e1 n
-    | munch_exp d (T.BINOP(T.MUL, e1, e2)) = binophit d X.IMUL e1 e2
-    | munch_exp d (T.BINOP(T.DIV, e1, e2)) =
-        let
-          val t1 = X.TEMP (Temp.new ("div") Tm.Long)
-          val (i1, s1) = munch_exp t1 e1
-          val (i2, s2) = munch_exp d e2
-        in
-          (i1 @ i2 @ [X.MOV ((X.REG X.EAX, s1), (t1, s1)), X.CLTD, X.IDIV (d, s2), X.MOV ((d, s2), (X.REG X.EAX, s2))], Tm.Long)
-        end
-    | munch_exp d (T.BINOP(T.MOD, e1, e2)) =
-        let
-          val t1 = X.TEMP (Temp.new ("div") Tm.Long)
-          val (i1, s1) = munch_exp t1 e1
-          val (i2, s2) = munch_exp d e2
-        in
-          (i1 @ i2 @ [X.MOV ((X.REG X.EAX, s1), (t1, s1)), X.CLTD, X.IDIV (d, s2), X.MOV ((d, s2), (X.REG X.EDX, s2))], Tm.Long)
-        end
-    | munch_exp d (T.BINOP(T.LSH, e1, T.CONST n)) = let val (i,s) = munch_exp d e1 in (i @ [X.SAL ((d,s), (X.CONST (n mod 0w32),s))],s) end
-    | munch_exp d (T.BINOP(T.LSH, e1, T.TEMP t)) =
-        let
-          val (i,s) = munch_exp d e1
-        in 
-          (i @ [X.MOV ((X.REG X.ECX, s), (X.TEMP t, s)), X.SAL ((d,s), (X.REG X.ECX, Tm.Byte))], s)
-        end
-    | munch_exp d (T.BINOP(T.LSH, e1, e2)) =
-        let
-          val t = X.TEMP (Temp.new ("lsh") Tm.Long)
-          val (i1, s1) = munch_exp d e1
-          val (i2, s2) = munch_exp t e2
-        in
-          (i1 @ i2 @ [X.MOV ((X.REG X.ECX, s1), (t, s1)), X.SAL ((d, s2), (X.REG X.ECX, Tm.Byte))], s2)
-        end
-    | munch_exp d (T.BINOP(T.RSH, e1, T.CONST n)) = let val (i,s) = munch_exp d e1 in (i @ [X.SAR ((d,s), (X.CONST (n mod 0w32),s))],s) end
-    | munch_exp d (T.BINOP(T.RSH, e1, T.TEMP t)) =
-        let
-          val (i,s) = munch_exp d e1
-        in 
-          (i @ [X.MOV ((X.REG X.ECX, s), (X.TEMP t, s)), X.SAR ((d,s), (X.REG X.ECX, Tm.Byte))], s)
-        end
-    | munch_exp d (T.BINOP(T.RSH, e1, e2)) =
-        let
-          val t = X.TEMP (Temp.new ("lsh") Tm.Long)
-          val (i1, s1) = munch_exp d e1
-          val (i2, s2) = munch_exp t e2
-        in
-          (i1 @ i2 @ [X.MOV ((X.REG X.ECX, s1), (t, s1)), X.SAR ((d, s2), (X.REG X.ECX, Tm.Byte))], s2)
-        end
-    | munch_exp d (T.BINOP(T.BITAND, T.CONST n, e1)) = binophit_c d X.AND e1 n
-    | munch_exp d (T.BINOP(T.BITAND, e1, T.CONST n)) = binophit_c d X.AND e1 n
-    | munch_exp d (T.BINOP(T.BITAND, T.TEMP t, e1)) = binophit_t d X.AND e1 t
-    | munch_exp d (T.BINOP(T.BITAND, e1, T.TEMP t)) = binophit_t d X.AND e1 t
+    | munch_exp d (T.BINOP(T.MUL, e1, e2)) = munch_exp d (T.CALL (Symbol.symbol "__blarg_mul", [e1, e2]))
+    | munch_exp d (T.BINOP(T.DIV, e1, e2)) = munch_exp d (T.CALL (Symbol.symbol "__blarg_div", [e1, e2]))
+    | munch_exp d (T.BINOP(T.MOD, e1, e2)) = munch_exp d (T.CALL (Symbol.symbol "__blarg_mod", [e1, e2]))
+    | munch_exp d (T.BINOP(T.LSH, e1, e2)) = binophit d X.SHL e1 e2
+    | munch_exp d (T.BINOP(T.RSH, e1, e2)) = binophit d X.SHR e1 e2

     | munch_exp d (T.BINOP(T.BITAND, e1, e2)) = binophit d X.AND e1 e2
     | munch_exp d (T.BINOP(T.BITAND, e1, e2)) = binophit d X.AND e1 e2

-
-    | munch_exp d (T.BINOP(T.BITOR, T.CONST n, e1)) = binophit_c d X.OR e1 n
-    | munch_exp d (T.BINOP(T.BITOR, e1, T.CONST n)) = binophit_c d X.OR e1 n
-    | munch_exp d (T.BINOP(T.BITOR, T.TEMP t, e1)) = binophit_t d X.OR e1 t
-    | munch_exp d (T.BINOP(T.BITOR, e1, T.TEMP t)) = binophit_t d X.OR e1 t
-    | munch_exp d (T.BINOP(T.BITOR, e1, e2)) = binophit d X.OR e1 e2
-
-    | munch_exp d (T.BINOP(T.BITXOR, T.CONST n, e1)) = binophit_c d X.XOR e1 n
-    | munch_exp d (T.BINOP(T.BITXOR, e1, T.CONST n)) = binophit_c d X.XOR e1 n
-    | munch_exp d (T.BINOP(T.BITXOR, T.TEMP t, e1)) = binophit_t d X.XOR e1 t
-    | munch_exp d (T.BINOP(T.BITXOR, e1, T.TEMP t)) = binophit_t d X.XOR e1 t
-    | munch_exp d (T.BINOP(T.BITXOR, e1, e2)) = binophit d X.XOR e1 e2
+    | munch_exp d (T.BINOP(T.BITOR, e1, e2)) = munch_exp d (T.UNOP (T.BITNOT, T.BINOP (T.BITAND, T.UNOP (T.BITNOT, e1), T.UNOP (T.BITNOT, e2))))
+    | munch_exp d (T.BINOP(T.BITXOR, e1, e2)) =
+        munch_exp d (T.BINOP(T.BITOR, T.BINOP(T.BITAND, e1, T.UNOP(T.BITNOT, e2)),
+                                      T.BINOP(T.BITAND, e2, T.UNOP(T.BITNOT, e1))))

 
     | munch_exp d (a as T.BINOP(T.LOGAND, e1, e2)) =
         let
           val (insn1, pos1, neg1) = munch_cond e1
           val (insn2, pos2, neg2) = munch_cond e2
 
     | munch_exp d (a as T.BINOP(T.LOGAND, e1, e2)) =
         let
           val (insn1, pos1, neg1) = munch_cond e1
           val (insn2, pos2, neg2) = munch_cond e2

-          val t1 = (X.TEMP (Tm.new "logand 1" Tm.Byte), Tm.Byte)
-          val t2 = (X.TEMP (Tm.new "logand 2" Tm.Byte), Tm.Byte)

           val l = Label.new ()
         in
           val l = Label.new ()
         in

-          if (TU.effect e2 orelse (length insn2 > 10))
-          then ((insn1) @
-                [X.SETcc(pos1, t1), X.Jcc (neg1, l)] @
-                (insn2) @
-                [X.SETcc(pos2, t1), X.LABEL l, X.MOVZB((d, Tm.Long), t1)], Tm.Long)
-          else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.AND(t1,t2), X.MOVZB((d, Tm.Long), t1)], Tm.Long)
+          (insn1) @
+          [X.INSN (X.AL, X.MOVLIT (d, 0w0)),
+           X.INSN (neg1, X.MOVLBL (X.REG X.PC, l))] @
+          (insn2) @
+          [X.INSN (pos2, X.MOVLIT (d, 0w1)),
+           X.LABEL l]

         end
     | munch_exp d (a as T.BINOP(T.LOGOR, e1, e2)) =
         let
           val (insn1, pos1, neg1) = munch_cond e1
           val (insn2, pos2, neg2) = munch_cond e2
         end
     | munch_exp d (a as T.BINOP(T.LOGOR, e1, e2)) =
         let
           val (insn1, pos1, neg1) = munch_cond e1
           val (insn2, pos2, neg2) = munch_cond e2

-          val t1 = (X.TEMP (Tm.new "logand 1" Tm.Byte), Tm.Byte)
-          val t2 = (X.TEMP (Tm.new "logand 2" Tm.Byte), Tm.Byte)
+          val t1 = X.TEMP (Tm.new "logand 1")
+          val t2 = X.TEMP (Tm.new "logand 2")

           val l = Label.new ()
         in
           val l = Label.new ()
         in

-          if (TU.effect e2 orelse (length insn2 > 10))
-          then ((insn1) @
-                [X.SETcc(pos1, t1), X.Jcc (pos1, l)] @
-                (insn2) @
-                [X.SETcc(pos2, t1), X.LABEL l, X.MOVZB((d, Tm.Long), t1)], Tm.Long)
-          else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.OR(t1,t2), X.MOVZB((d, Tm.Long), t1)], Tm.Long)
+          (insn1) @
+          [X.INSN (X.AL, X.MOVLIT (d, 0w0)),
+           X.INSN (pos1, X.MOVLIT (d, 0w1)),
+           X.INSN (pos1, X.MOVLBL (X.REG X.PC, l))] @
+          (insn2) @
+          [X.INSN (pos2, X.MOVLIT (d, 0w1)),
+           X.LABEL l]

         end
     | munch_exp d (a as T.BINOP(T.EQ, _, _)) = cmphit d a
     | munch_exp d (a as T.BINOP(T.NEQ, _, _)) = cmphit d a
         end
     | munch_exp d (a as T.BINOP(T.EQ, _, _)) = cmphit d a
     | munch_exp d (a as T.BINOP(T.NEQ, _, _)) = cmphit d a


@@ -235,32 +173,41 @@ struct
     | munch_exp d (a as T.BINOP(T.GT, _, _)) = cmphit d a
     | munch_exp d (a as T.BINOP(T.BE, _, _)) = cmphit d a
 
     | munch_exp d (a as T.BINOP(T.GT, _, _)) = cmphit d a
     | munch_exp d (a as T.BINOP(T.BE, _, _)) = cmphit d a
 

-    | munch_exp d (T.UNOP(T.NEG, e1)) = let val (i, s) = munch_exp d e1 in (i @ [X.NEG (d, Tm.Long)], s) end
-    | munch_exp d (T.UNOP(T.BITNOT, e1)) = let val (i, s) = munch_exp d e1 in (i @ [X.NOT (d, Tm.Long)], s) end
+    | munch_exp d (T.UNOP(T.NEG, e1)) =
+        let
+          val t = Temp.new "-val"
+          val i = munch_exp (X.TEMP t) e1
+        in
+          (i) @
+          [X.INSN (X.AL, X.MOVLIT (d, 0w0)),
+           X.INSN (X.AL, X.SUB (d, X.TEMP t))]
+        end
+    | munch_exp d (T.UNOP(T.BITNOT, e1)) = let val i = munch_exp d e1 in i @ [X.INSN (X.AL, X.NOT (d, d))] end

     | munch_exp d (T.UNOP(T.BANG, e)) = 
         let
           val (insns, pos, neg) = munch_cond e
         in
     | munch_exp d (T.UNOP(T.BANG, e)) = 
         let
           val (insns, pos, neg) = munch_cond e
         in

-          (insns @ [X.SETcc (neg, (d, Tm.Byte)), X.MOVZB((d, Tm.Long), (d, Tm.Byte))], Tm.Long)
+          insns @
+          [X.INSN (X.AL, X.MOVLIT (d, 0w0)),
+           X.INSN (neg, X.MOVLIT (d, 0w1))]

         end
         end

-    | munch_exp d (T.MEMORY (e1,s)) =
+    | munch_exp d (T.MEMORY (e1)) =

         let
         let

-          val a = X.TEMP (Temp.new "addr" Tm.Quad)
-          val (i, s') = munch_exp a e1
-          val _ = if s' = Tm.Quad then () else raise ErrorMsg.InternalError "memory fuxed."
+          val a = X.TEMP (Temp.new "addr")
+          val i = munch_exp a e1

         in
         in

-          (i @ [X.MOV ((d,s), (X.REL ((a, Tm.Quad), (X.CONST 0w0, Tm.Quad), 0w1), s))], s)
+          i @
+          [X.INSN (X.AL, X.LDR (d, a))]

         end
         end

+    

     | munch_exp d (T.ALLOC(exp)) =
     | munch_exp d (T.ALLOC(exp)) =

-        

         let
         let

-          val t1 = Temp.new "alloc" Tm.Long
+          val t1 = Temp.new "alloc"

           val l1 = Label.new()
           val l1 = Label.new()

-          val (einsn, _) = munch_exp (X.TEMP t1) exp
-          val (insns, _) = munch_exp d (T.CALL (Symbol.symbol "calloc", [(T.TEMP t1, Tm.Long), (T.CONST 0w1, Tm.Long)], Tm.Quad))
-          val rd = (d, Tm.Quad)
+          val einsn = munch_exp (X.TEMP t1) exp
+          val insns = munch_exp d (T.CALL (Symbol.symbol "calloc", [T.TEMP t1, T.CONST 0w1]))

         in
         in

-          (einsn @ insns, Tm.Quad)
+          einsn @ insns 

         end
 (*    | munch_exp d (T.COND(c, T.CONST n1, T.CONST n2)) = let val (i,p,n) = munch_cond c in ((X.MOV (d, X.CONST n1))::i) @ [X.CMOVcc (p, d, X.CONST n2)] end *)
     | munch_exp d (T.COND(c,e1,e2)) =
         end
 (*    | munch_exp d (T.COND(c, T.CONST n1, T.CONST n2)) = let val (i,p,n) = munch_cond c in ((X.MOV (d, X.CONST n1))::i) @ [X.CMOVcc (p, d, X.CONST n2)] end *)
     | munch_exp d (T.COND(c,e1,e2)) =


@@ -268,37 +215,28 @@ struct
           val (insns, pos, neg) = munch_cond c
           val l1 = Label.new()
           val l2 = Label.new()
           val (insns, pos, neg) = munch_cond c
           val l1 = Label.new()
           val l2 = Label.new()

-          val (i1, s1) = munch_exp d e1
-          val (i2, s2) = munch_exp d e2
+          val i1 = munch_exp d e1
+          val i2 = munch_exp d e2

 (*          val _ = print ("cond: size " ^ Tm.sfx s1 ^ " from " ^ TU.Print.pp_exp e1 ^ ", " ^ Tm.sfx s2 ^ " from " ^ TU.Print.pp_exp e2 ^ "\n") *)
         in
 (*          val _ = print ("cond: size " ^ Tm.sfx s1 ^ " from " ^ TU.Print.pp_exp e1 ^ ", " ^ Tm.sfx s2 ^ " from " ^ TU.Print.pp_exp e2 ^ "\n") *)
         in

-          (insns @ [X.Jcc(neg, l1)] @ i1 @ [X.JMP l2, X.LABEL l1] @ i2 @ [X.LABEL l2], if s1 = s2 then s1 else raise ErrorMsg.InternalError "condfuxed.")
+          insns @
+          [X.INSN (neg, X.MOVLBL (X.REG X.PC, l1))] @
+          i1 @
+          [X.INSN (X.AL, X.MOVLBL (X.REG X.PC, l2)),
+           X.LABEL l1] @
+          i2 @
+          [X.LABEL l2]

         end
         end

-    | munch_exp d (T.STMVAR (sl, e)) = let val (i, s) = munch_exp d e in (List.concat (map munch_stm sl) @ i, s) end
+    | munch_exp d (T.STMVAR (sl, e)) = let val i = munch_exp d e in List.concat (map munch_stm sl) @ i end

 
 

-  and condhit_tc t c (pos, neg) = ([X.CMP((X.TEMP t, Tm.size t), (X.CONST c, Tm.size t))], pos, neg)
-  and condhit_c e c (pos, neg) =
-    let
-      val t = X.TEMP (Temp.new "consthit" Tm.Long)
-      val (i,s) = munch_exp t e
-    in
-      (i @ [X.CMP ((t,s), (X.CONST c,s))], pos, neg)
-    end
-  and condhit_t e t (pos, neg) =
-    let
-      val t' = X.TEMP (Temp.new "consthit" Tm.Long)
-      val (i,s) = munch_exp t' e
-    in
-      (i @ [X.CMP ((t',s), (X.TEMP t,s))], pos, neg)
-    end

   and condhit e1 e2 (pos, neg) =
     let
   and condhit e1 e2 (pos, neg) =
     let

-      val t1 = X.TEMP (Temp.new ("var neq 1") Tm.Long)
-      val t2 = X.TEMP (Temp.new ("var neq 2") Tm.Long)
-      val (i1, s1) = munch_exp t1 e1
-      val (i2, s2) = munch_exp t2 e2
+      val t1 = X.TEMP (Temp.new ("var cond 1"))
+      val t2 = X.TEMP (Temp.new ("var cond 2"))
+      val i1 = munch_exp t1 e1
+      val i2 = munch_exp t2 e2

     in
     in

-      (i1 @ i2 @ [X.CMP((t1,s1),(t2,s2))], pos, neg)
+      (i1 @ i2 @ [X.INSN (X.AL, X.SUBS (t1, t2))], pos, neg)

     end
 
   (* munch_cond : T.exp -> X.insn list * X.cond * X.cond
     end
 
   (* munch_cond : T.exp -> X.insn list * X.cond * X.cond


@@ -311,156 +249,72 @@ struct
         in
           (insns, neg, pos)
         end
         in
           (insns, neg, pos)
         end

-    | munch_cond (T.BINOP(T.NEQ, T.TEMP t, T.CONST n)) = condhit_tc t n (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, T.CONST n, T.TEMP t)) = condhit_tc t n (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, T.CONST n, e1)) = condhit_c e1 n (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, e1, T.CONST n)) = condhit_c e1 n (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, T.TEMP t, e1)) = condhit_t e1 t (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, e1, T.TEMP t)) = condhit_t e1 t (X.NE, X.E)
-    | munch_cond (T.BINOP(T.NEQ, e1, e2)) = condhit e1 e2 (X.NE, X.E)
-
-    | munch_cond (T.BINOP(T.EQ, T.TEMP t, T.CONST n)) = condhit_tc t n (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, T.CONST n, T.TEMP t)) = condhit_tc t n (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, T.CONST n, e1)) = condhit_c e1 n (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, e1, T.CONST n)) = condhit_c e1 n (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, T.TEMP t, e1)) = condhit_t e1 t (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, e1, T.TEMP t)) = condhit_t e1 t (X.E, X.NE)
-    | munch_cond (T.BINOP(T.EQ, e1, e2)) = condhit e1 e2 (X.E, X.NE)
-
-    | munch_cond (T.BINOP(T.LE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.LE, X.G)
-    | munch_cond (T.BINOP(T.LE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.GE, X.L)
-    | munch_cond (T.BINOP(T.LE, T.CONST n, e1)) = condhit_c e1 n (X.GE, X.L)
-    | munch_cond (T.BINOP(T.LE, e1, T.CONST n)) = condhit_c e1 n (X.LE, X.G)
-    | munch_cond (T.BINOP(T.LE, T.TEMP t, e1)) = condhit_t e1 t (X.GE, X.L)
-    | munch_cond (T.BINOP(T.LE, e1, T.TEMP t)) = condhit_t e1 t (X.LE, X.G)
-    | munch_cond (T.BINOP(T.LE, e1, e2)) = condhit e1 e2 (X.LE, X.G)
-
-    | munch_cond (T.BINOP(T.LT, T.TEMP t, T.CONST n)) = condhit_tc t n (X.L, X.GE)
-    | munch_cond (T.BINOP(T.LT, T.CONST n, T.TEMP t)) = condhit_tc t n (X.G, X.LE)
-    | munch_cond (T.BINOP(T.LT, T.CONST n, e1)) = condhit_c e1 n (X.G, X.LE)
-    | munch_cond (T.BINOP(T.LT, e1, T.CONST n)) = condhit_c e1 n (X.L, X.GE)
-    | munch_cond (T.BINOP(T.LT, T.TEMP t, e1)) = condhit_t e1 t (X.G, X.LE)
-    | munch_cond (T.BINOP(T.LT, e1, T.TEMP t)) = condhit_t e1 t (X.L, X.GE)
-    | munch_cond (T.BINOP(T.LT, e1, e2)) = condhit e1 e2 (X.L, X.GE)
-
-    | munch_cond (T.BINOP(T.GT, T.TEMP t, T.CONST n)) = condhit_tc t n (X.G, X.LE)
-    | munch_cond (T.BINOP(T.GT, T.CONST n, T.TEMP t)) = condhit_tc t n (X.L, X.GE)
-    | munch_cond (T.BINOP(T.GT, T.CONST n, e1)) = condhit_c e1 n (X.L, X.GE)
-    | munch_cond (T.BINOP(T.GT, e1, T.CONST n)) = condhit_c e1 n (X.G, X.LE)
-    | munch_cond (T.BINOP(T.GT, T.TEMP t, e1)) = condhit_t e1 t (X.L, X.GE)
-    | munch_cond (T.BINOP(T.GT, e1, T.TEMP t)) = condhit_t e1 t (X.G, X.LE)
-    | munch_cond (T.BINOP(T.GT, e1, e2)) = condhit e1 e2 (X.G, X.LE)
+    | munch_cond (T.BINOP(T.NEQ, e1, e2)) = condhit e1 e2 (X.NE, X.EQ)
+    | munch_cond (T.BINOP(T.EQ, e1, e2)) =  condhit e1 e2 (X.EQ, X.NE)
+    | munch_cond (T.BINOP(T.LE, e1, e2)) =  condhit e1 e2 (X.LE, X.GT)
+    | munch_cond (T.BINOP(T.LT, e1, e2)) =  condhit e1 e2 (X.LT, X.GE)
+    | munch_cond (T.BINOP(T.GT, e1, e2)) =  condhit e1 e2 (X.GT, X.LE)
+    | munch_cond (T.BINOP(T.GE, e1, e2)) =  condhit e1 e2 (X.GE, X.LT)

 
 

-    | munch_cond (T.BINOP(T.GE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.GE, X.L)
-    | munch_cond (T.BINOP(T.GE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.LE, X.G)
-    | munch_cond (T.BINOP(T.GE, T.CONST n, e1)) = condhit_c e1 n (X.LE, X.G)
-    | munch_cond (T.BINOP(T.GE, e1, T.CONST n)) = condhit_c e1 n (X.GE, X.L)
-    | munch_cond (T.BINOP(T.GE, T.TEMP t, e1)) = condhit_t e1 t (X.LE, X.G)
-    | munch_cond (T.BINOP(T.GE, e1, T.TEMP t)) = condhit_t e1 t (X.GE, X.L)
-    | munch_cond (T.BINOP(T.GE, e1, e2)) = condhit e1 e2 (X.GE, X.L)
+    | munch_cond (T.BINOP(T.BE, e1, e2)) = raise ErrorMsg.InternalError "memory safety not supported"

 
 

-    | munch_cond (T.BINOP(T.BE, T.TEMP t, T.CONST n)) = condhit_tc t n (X.BE, X.A)
-    | munch_cond (T.BINOP(T.BE, T.CONST n, T.TEMP t)) = condhit_tc t n (X.AE, X.B)
-    | munch_cond (T.BINOP(T.BE, T.CONST n, e1)) = condhit_c e1 n (X.AE, X.B)
-    | munch_cond (T.BINOP(T.BE, e1, T.CONST n)) = condhit_c e1 n (X.BE, X.A)
-    | munch_cond (T.BINOP(T.BE, T.TEMP t, e1)) = condhit_t e1 t (X.AE, X.B)
-    | munch_cond (T.BINOP(T.BE, e1, T.TEMP t)) = condhit_t e1 t (X.BE, X.A)
-    | munch_cond (T.BINOP(T.BE, e1, e2)) = condhit e1 e2 (X.BE, X.A)
-
-    | munch_cond (T.BINOP(T.LOGOR, e1, e2)) =
-        let
-          val (insn1, pos1, neg1) = munch_cond e1
-          val (insn2, pos2, neg2) = munch_cond e2
-          val t1 = (X.TEMP (Temp.new("logor c 1") Tm.Byte), Tm.Byte)
-          val t2 = (X.TEMP (Temp.new("logor c 2") Tm.Byte), Tm.Byte)
-          val l = Label.new ()
-        in
-          if (TU.effect e2 orelse (length insn2 > 10))
-          then ((insn1) @
-                [X.SETcc (pos1, t1), X.Jcc (pos1, l)] @
-                (insn2) @
-                [X.SETcc (pos2, t1), X.LABEL l, X.TEST(t1, t1)],
-                X.NE, X.E)
-          else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.OR(t1, t2)], X.NE, X.E)
-        end
-    | munch_cond (T.BINOP(T.LOGAND, e1, e2)) =
-        let
-          val (insn1, pos1, neg1) = munch_cond e1
-          val (insn2, pos2, neg2) = munch_cond e2
-          val t1 = (X.TEMP (Temp.new("logand c 1") Tm.Byte), Tm.Byte)
-          val t2 = (X.TEMP (Temp.new("logand c 2") Tm.Byte), Tm.Byte)
-          val l = Label.new ()
-        in
-          if (TU.effect e2 orelse (length insn2 > 10))
-          then ((insn1) @
-                [X.SETcc (pos1, t1), X.Jcc (neg1, l)] @
-                (insn2) @
-                [X.SETcc (pos2, t1), X.LABEL l, X.TEST(t1, t1)],
-                X.NE, X.E)
-          else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.AND(t1, t2)], X.NE, X.E)
-        end

     | munch_cond e =
       let
     | munch_cond e =
       let

-        val t = X.TEMP (Temp.new ("munch c") Tm.Long)
-        val (i, s) = munch_exp t e
+        val t = X.TEMP (Temp.new ("munch c"))
+        val i = munch_exp t e

       in
       in

-        (i @ [ X.TEST ((t,s),(t,s)) ], X.NE, X.E)
+        (i @ [ X.INSN (X.AL, X.MOVS (t,t)) ], X.NE, X.EQ)

       end
 
       end
 

-  (* munch_lval : T.exp -> (X.insn list * X.operand)
-   * Takes an expression that has been typechecked as being a valid lvalue, and then returns an instruction list and an operand to store your shit in.
+  (* munch_lval : T.exp -> X.operand
+   * Takes an expression that has been typechecked as being a valid lvalue and a location of a datum, and then returns an instruction list to store.

    *)
    *)

-  and munch_lval (T.TEMP t) = ([], (X.TEMP t, Tm.size t))
-    | munch_lval (T.MEMORY (m,s)) = 
+  and munch_lval (T.TEMP t) oper = [X.INSN (X.AL, X.MOV (X.TEMP t, oper))]
+    | munch_lval (T.MEMORY m) oper = 

       let
       let

-        val t = X.TEMP (Tm.new "lv addr" Tm.Quad)
-        val (i,s') = munch_exp t m
+        val t = X.TEMP (Tm.new "lv addr")
+        val i = munch_exp t m

       in
       in

-        (i, (X.REL ((t, Tm.Quad), (X.CONST 0w0, Tm.Quad), 0w1), s))
+        i @
+        [X.INSN (X.AL, X.STO (t, oper))]

       end
       end

-    | munch_lval _ = raise ErrorMsg.InternalError "That wasn't really a valid lvalue..."
+    | munch_lval _ _ = raise ErrorMsg.InternalError "That wasn't really a valid lvalue..."

 
   (* munch_stm : T.stm -> X.insn list *)
   (* munch_stm stm generates code to execute stm *)
 
   (* munch_stm : T.stm -> X.insn list *)
   (* munch_stm stm generates code to execute stm *)

-  and munch_stm (T.MOVE (T.TEMP t1, T.TEMP t2)) = if Tm.size t1 = Tm.size t2 then [X.MOV((X.TEMP t1, Tm.size t1), (X.TEMP t2, Tm.size t2))]
-                                                                             else raise ErrorMsg.InternalError "temp to temp move fuxed."
-    | munch_stm (T.MOVE (T.TEMP t, T.CONST n)) = if Tm.size t = Tm.Long then [X.MOV((X.TEMP t, Tm.size t), (X.CONST n, Tm.size t))]
-                                                                        else raise ErrorMsg.InternalError "const to temp move fuxed."
-    | munch_stm (T.MOVE (T.TEMP t, a as T.ARG (an, sz))) =
+  and munch_stm (T.MOVE (T.TEMP t1, T.TEMP t2)) = [X.INSN (X.AL, X.MOV(X.TEMP t1, X.TEMP t2))]
+    | munch_stm (T.MOVE (T.TEMP t, T.CONST n)) = [X.INSN (X.AL, X.MOVLIT(X.TEMP t, Word.fromLarge n))]
+    | munch_stm (T.MOVE (T.TEMP t, a as T.ARG (an))) =

         let
         let

-          val (i, s) = munch_exp (X.TEMP t) a
+          val i = munch_exp (X.TEMP t) a

         in
         in

-          if s = Tm.size t
-          then i
-          else raise ErrorMsg.InternalError "arg to tmp fuxed."
+          i

         end
         end

-    | munch_stm (T.MOVE (T.TEMP t, a as T.CALL _)) = let val (i, _) = munch_exp (X.TEMP t) a in i end
+    | munch_stm (T.MOVE (T.TEMP t, a as T.CALL _)) = munch_exp (X.TEMP t) a

     | munch_stm (T.MOVE (a, e2)) =
         let
     | munch_stm (T.MOVE (a, e2)) =
         let

-          val t = X.TEMP (Temp.new ("assign") Tm.Long)
-          val (m, (r,s1)) = munch_lval a
-          val (i, s2) = munch_exp t e2
-(*          val _ = print ("move: size " ^ Tm.sfx s2 ^ " from " ^ TU.Print.pp_exp e2 ^ ", " ^ Tm.sfx s1 ^ " from " ^ TU.Print.pp_exp a ^ "\n") *)
-          val _ = if s1 = s2 then () else raise ErrorMsg.InternalError "move generic fuxed."
+          val t = X.TEMP (Temp.new ("assign"))
+          val i = munch_exp t e2
+          val li = munch_lval a t

         in
         in

-          m @ i @ [X.MOV((r,s1), (t,s2))]
+          i @ li

         end
         end

-    | munch_stm (T.RETURN(e, sz)) =
+    | munch_stm (T.RETURN(e)) =

         let
         let

-          val t = X.TEMP (Temp.new ("retval") sz)
-          val (i, s) = munch_exp t e
+          val t = X.TEMP (Temp.new ("retval"))
+          val i = munch_exp t e

         in
         in

-          i @ [X.MOV((X.REG X.EAX, sz), (t, if sz = s then sz else raise ErrorMsg.InternalError "retfuxed.")), X.RET]
+          i @ [X.INSN (X.AL, X.MOV(X.REG X.R0, t)), X.INSN (X.AL, X.POP (X.REG X.SP, X.REG X.PC))]

         end
     | munch_stm (T.LABEL l) = [X.LABEL l]
         end
     | munch_stm (T.LABEL l) = [X.LABEL l]

-    | munch_stm (T.JUMP l) = [X.JMP l]
+    | munch_stm (T.JUMP l) = [X.INSN (X.AL, X.MOVLBL (X.REG X.PC, l))]

     | munch_stm (T.JUMPIFN(e, l)) =
        let
          val (insns, pos, neg) = munch_cond e 
        in
     | munch_stm (T.JUMPIFN(e, l)) =
        let
          val (insns, pos, neg) = munch_cond e 
        in

-         insns @ [X.Jcc (neg, l)]
+         insns @ [X.INSN (neg, X.MOVLBL (X.REG X.PC, l))]

        end
        end

-    | munch_stm (T.EFFECT exp) = let val t = X.TEMP (Temp.new "throwaway" Tm.Quad) val (i, _) = munch_exp t exp in i end
+    | munch_stm (T.EFFECT exp) = let val t = X.TEMP (Temp.new "throwaway") val i = munch_exp t exp in i end

 
   fun codegen nil = nil
     | codegen (stm::stms) = munch_stm stm @ codegen stms
 
   fun codegen nil = nil
     | codegen (stm::stms) = munch_stm stm @ codegen stms