-(* L1 Compiler
- * Assembly Code Generator for FAKE assembly
- * Author: Alex Vaynberg <alv@andrew.cmu.edu>
- * Based on code by: Kaustuv Chaudhuri <kaustuv+@cs.cmu.edu>
- * Modified: Frank Pfenning <fp@cs.cmu.edu>
- *
- * Implements a "convenient munch" algorithm
+(* L3 Compiler
+ * Assembly code generator for fake x86 assembly
+ * Author: Joshua Wise <jwise@andrew.cmu.edu>
+ * Author: Chris Lu <czl@andrew.cmu.edu>
*)
signature CODEGEN =
structure T = Tree
structure X = x86
+ (* effect : T.exp -> bool
+ * true iff the given expression has an effect.
+ *)
+ fun effect (T.BINOP(T.DIV, _, _)) = true
+ | effect (T.BINOP(T.MOD, _, _)) = true
+ | effect (T.CALL _) = true
+ | effect (T.BINOP(_, a, b)) = (effect a) orelse (effect b)
+ | effect (T.UNOP (_, a)) = effect a
+ | effect _ = false
+
+ (* hasfixed : T.exp -> bool
+ * true iff the given expression has an hasfixed. Somewhat like effect, hmm?
+ *)
+ 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
+ | hasfixed (T.BINOP(_, a, b)) = (hasfixed a) orelse (hasfixed b)
+ | hasfixed (T.UNOP (_, a)) = hasfixed a
+ | hasfixed _ = false
+
(* 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)
*)
- fun munch_exp d (T.CONST(n)) = [X.MOVL(d, X.CONST n)]
- | munch_exp d (T.TEMP(t)) = [X.MOVL(d, X.TEMP t)]
- | munch_exp d (T.BINOP(T.ADD, e1, T.CONST n)) = (munch_exp d e1) @ [X.ADDL(d, X.CONST n)]
- | munch_exp d (T.BINOP(T.ADD, T.CONST n, e1)) = (munch_exp d e1) @ [X.ADDL(d, X.CONST n)]
- | munch_exp d (T.BINOP(T.ADD, e1, e2)) = let val t1 = Temp.new () in (munch_exp d e1) @ (munch_exp (X.TEMP t1) e2) @ [X.ADDL(d, X.TEMP t1)] end
+ fun munch_exp d (T.CONST(n)) = [X.MOV(d, X.CONST n)]
+ | munch_exp d (T.TEMP(t)) = [X.MOV(d, X.TEMP t)]
+ | munch_exp d (T.ARG(0)) = [X.MOV(d, X.REG X.EDI)]
+ | munch_exp d (T.ARG(1)) = [X.MOV(d, X.REG X.ESI)]
+ | munch_exp d (T.ARG(2)) = [X.MOV(d, X.REG X.EDX)]
+ | munch_exp d (T.ARG(3)) = [X.MOV(d, X.REG X.ECX)]
+ | munch_exp d (T.ARG(4)) = [X.MOV(d, X.REG X.R8D)]
+ | munch_exp d (T.ARG(5)) = [X.MOV(d, X.REG X.R9D)]
+ | munch_exp d (T.ARG(t)) = [X.MOV(d, X.STACKARG (t - 6))]
+ | munch_exp d (T.CALL(name, l)) = (* Scary demons live here. *)
+ let
+ val nargs = length l
+ val nstack = if (nargs <= 6)
+ 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.RSP, (~(stackb - 8 * (n - 7))))
+
+ val dests = List.tabulate (nargs, fn x => argdest (x+1))
+ val hf = List.map hasfixed l
+ val (d_hf, exps_hf) = ListPair.unzip (ListPair.foldr
+ (fn (a,b,c) => if b then a::c else c)
+ nil
+ (ListPair.zip (dests,l), hf)
+ )
+ val (d_nohf, exps_nohf) = ListPair.unzip (ListPair.foldr
+ (fn (a,b,c) => if b then c else a::c)
+ nil
+ (ListPair.zip (dests,l), hf)
+ )
+ val temps = List.tabulate (List.length d_hf, fn x => Temp.new(Int.toString x ^ " arg"))
+ val argevals_hf = List.map
+ (fn (t,exp) => munch_exp (X.TEMP t) exp)
+ (ListPair.zip (temps, exps_hf))
+ val argpushes = List.map
+ (fn (dest, t) => [(X.MOV (dest, X.TEMP t))])
+ (ListPair.zip (d_hf, temps))
+ val argevals_nohf = List.map
+ (fn (d,exp) => munch_exp d exp)
+ (ListPair.zip (d_nohf, exps_nohf))
+ in
+ List.concat argevals_hf @
+ List.concat argpushes @
+ List.concat argevals_nohf @
+ [ X.SIZE (X.Qword, X.SUB (X.REG X.RSP, X.CONST (Word32.fromInt stackb))),
+ X.CALL (name, nargs),
+ X.SIZE (X.Qword, X.ADD (X.REG X.RSP, X.CONST (Word32.fromInt stackb))),
+ X.MOV (d, X.REG X.EAX) ] (* Finally! *)
+ end
+ | munch_exp d (T.BINOP(T.ADD, e1, T.CONST 0w0)) = munch_exp d e1
+ | munch_exp d (T.BINOP(T.ADD, T.CONST 0w0, e1)) = munch_exp d e1
+ | munch_exp d (T.BINOP(T.ADD, e1, T.CONST n)) = (munch_exp d e1) @ [X.ADD(d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.ADD, T.CONST n, e1)) = (munch_exp d e1) @ [X.ADD(d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.ADD, e1, T.TEMP t)) = (munch_exp d e1) @ [X.ADD(d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.ADD, T.TEMP t, e2)) = (munch_exp d e2) @ [X.ADD(d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.ADD, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("add"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.ADD(d, t1)]
+ end
| munch_exp d (T.BINOP(T.SUB, T.CONST 0w0, e1)) = (munch_exp d e1) @ [X.NEG d]
- | munch_exp d (T.BINOP(T.SUB, e1, T.CONST(n))) = (munch_exp d e1) @ [X.SUBL(d, X.CONST n)]
- | munch_exp d (T.BINOP(T.SUB, e1, e2)) = let val t1 = Temp.new () in (munch_exp d e1) @ (munch_exp (X.TEMP t1) e2) @ [X.SUBL(d, X.TEMP t1)] end
+ | munch_exp d (T.BINOP(T.SUB, e1, T.CONST 0w0)) = munch_exp d e1
+ | munch_exp d (T.BINOP(T.SUB, e1, T.CONST(n))) = (munch_exp d e1) @ [X.SUB(d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.SUB, e1, T.TEMP t)) = (munch_exp d e1) @ [X.SUB(d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.SUB, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("sub"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.SUB(d, t1)]
+ end
| munch_exp d (T.BINOP(T.MUL, T.TEMP t, T.CONST n)) = [X.IMUL3(d, X.TEMP t, n)]
| munch_exp d (T.BINOP(T.MUL, T.CONST n, T.TEMP t)) = [X.IMUL3(d, X.TEMP t, n)]
+ | munch_exp d (T.BINOP(T.MUL, e1, T.CONST 0w1)) = munch_exp d e1
+ | munch_exp d (T.BINOP(T.MUL, T.CONST 0w1, e1)) = munch_exp d e1
| munch_exp d (T.BINOP(T.MUL, e1, T.CONST n)) = (munch_exp d e1) @ [X.IMUL(d, X.CONST n)]
| munch_exp d (T.BINOP(T.MUL, T.CONST n, e1)) = (munch_exp d e1) @ [X.IMUL(d, X.CONST n)]
- | munch_exp d (T.BINOP(T.MUL, e1, e2)) = let val t1 = Temp.new () in (munch_exp d e1) @ (munch_exp (X.TEMP t1) e2) @ [X.IMUL(d, X.TEMP t1)] end
- | munch_exp d (T.BINOP(T.DIV, e1, e2)) = let val t1 = Temp.new () in (munch_exp (X.TEMP t1) e1) @ (munch_exp d e2) @ [X.MOVL (X.REG X.EAX, X.TEMP t1), X.CLTD, X.IDIVL d, X.MOVL (d, X.REG X.EAX)] end
- | munch_exp d (T.BINOP(T.MOD, e1, e2)) = let val t1 = Temp.new () in (munch_exp (X.TEMP t1) e1) @ (munch_exp d e2) @ [X.MOVL (X.REG X.EAX, X.TEMP t1), X.CLTD, X.IDIVL d, X.MOVL (d, X.REG X.EDX)] end
+ | munch_exp d (T.BINOP(T.MUL, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("mul"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.IMUL(d, t1)]
+ end
+ | munch_exp d (T.BINOP(T.DIV, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("div"))
+ in
+ (munch_exp t1 e1) @ (munch_exp d e2) @
+ [X.MOV (X.REG X.EAX, t1), X.CLTD, X.IDIV d, X.MOV (d, X.REG X.EAX)]
+ end
+ | munch_exp d (T.BINOP(T.MOD, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("mod"))
+ in
+ (munch_exp t1 e1) @ (munch_exp d e2) @
+ [X.MOV (X.REG X.EAX, t1), X.CLTD, X.IDIV d, X.MOV (d, X.REG X.EDX)]
+ end
+ | munch_exp d (T.BINOP(T.LSH, e1, T.CONST n)) = (munch_exp d e1) @ [X.SAL (d, X.CONST (n mod 0w32))]
+ | munch_exp d (T.BINOP(T.LSH, e1, T.TEMP t)) = (munch_exp d e1) @ [X.MOV (X.REG X.ECX, X.TEMP t), X.SAL (d, X.REG X.ECX)]
+ | munch_exp d (T.BINOP(T.LSH, e1, e2)) =
+ let
+ val t = X.TEMP (Temp.new ("lsh"))
+ in
+ (munch_exp d e1) @ (munch_exp t e2) @ [X.MOV (X.REG X.ECX, t), X.SAL (d, X.REG X.ECX)]
+ end
+ | munch_exp d (T.BINOP(T.RSH, e1, T.CONST n)) = (munch_exp d e1) @ [X.SAR (d, X.CONST (n mod 0w32))]
+ | munch_exp d (T.BINOP(T.RSH, e1, T.TEMP t)) = (munch_exp d e1) @ [X.MOV (X.REG X.ECX, X.TEMP t), X.SAR (d, X.REG X.ECX)]
+ | munch_exp d (T.BINOP(T.RSH, e1, e2)) =
+ let
+ val t = X.TEMP (Temp.new ("rsh"))
+ in
+ (munch_exp d e1) @ (munch_exp t e2) @ [X.MOV (X.REG X.ECX, t), X.SAR (d, X.REG X.ECX)]
+ end
+ | munch_exp d (T.BINOP(T.BITAND, T.CONST n, e1)) = (munch_exp d e1) @ [X.AND (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITAND, e1, T.CONST n)) = (munch_exp d e1) @ [X.AND (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITAND, T.TEMP t, e1)) = (munch_exp d e1) @ [X.AND (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITAND, e1, T.TEMP t)) = (munch_exp d e1) @ [X.AND (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITAND, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("bitand"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.AND(d, t1)]
+ end
+ | munch_exp d (T.BINOP(T.BITOR, T.CONST n, e1)) = (munch_exp d e1) @ [X.OR (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITOR, e1, T.CONST n)) = (munch_exp d e1) @ [X.OR (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITOR, T.TEMP t, e1)) = (munch_exp d e1) @ [X.OR (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITOR, e1, T.TEMP t)) = (munch_exp d e1) @ [X.OR (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITOR, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("bitor"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.OR(d, t1)]
+ end
+ | munch_exp d (T.BINOP(T.BITXOR, T.CONST n, e1)) = (munch_exp d e1) @ [X.XOR (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITXOR, e1, T.CONST n)) = (munch_exp d e1) @ [X.XOR (d, X.CONST n)]
+ | munch_exp d (T.BINOP(T.BITXOR, T.TEMP t, e1)) = (munch_exp d e1) @ [X.XOR (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITXOR, e1, T.TEMP t)) = (munch_exp d e1) @ [X.XOR (d, X.TEMP t)]
+ | munch_exp d (T.BINOP(T.BITXOR, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("bitxor"))
+ in
+ (munch_exp d e1) @ (munch_exp t1 e2) @ [X.XOR(d, t1)]
+ end
+ | 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 (Temp.new("logand 1"))
+ val t2 = X.TEMP (Temp.new("logand 2"))
+ val l = Label.new ()
+ in
+ if (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, t1)]
+ else insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.SIZE(X.Byte, X.AND(t1, t2)), X.MOVZB(d, t1)]
+ 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 (Temp.new("logor 1"))
+ val t2 = X.TEMP (Temp.new("logor 2"))
+ val l = Label.new ()
+ in
+ if (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, t1)]
+ else insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.SIZE(X.Byte, X.OR(t1, t2)), X.MOVZB(d, t1)]
+ end
+ | munch_exp d (a as T.BINOP(T.EQ, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (a as T.BINOP(T.NEQ, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (a as T.BINOP(T.LE, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (a as T.BINOP(T.LT, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (a as T.BINOP(T.GE, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (a as T.BINOP(T.GT, _, _)) =
+ let val (insns, pos, neg) = munch_cond a in insns @ [X.SETcc (pos, d), X.MOVZB(d, d)] end
+ | munch_exp d (T.UNOP(T.NEG, T.CONST n)) = [X.MOV (d, X.CONST (~n))]
+ | munch_exp d (T.UNOP(T.NEG, e1)) = (munch_exp d e1) @ [X.NEG d]
+ | munch_exp d (T.UNOP(T.BITNOT, T.CONST n)) = [X.MOV (d, X.CONST (Word32.notb n))]
+ | munch_exp d (T.UNOP(T.BITNOT, e1)) = (munch_exp d e1) @ [X.NOT d]
+ | munch_exp d (T.UNOP(T.BANG, T.CONST n)) = if (n = 0w0) then [X.MOV (d, X.CONST 0w1)] else [X.MOV (d, X.CONST 0w0)]
+ | munch_exp d (T.UNOP(T.BANG, e)) =
+ let
+ val (insns, pos, neg) = munch_cond e
+ in
+ insns @ [X.SETcc (neg, d), X.MOVZB(d, d)]
+ end
+ (* munch_cond : T.exp -> X.insn list * X.cond * X.cond
+ * munch_cond stm generates code to set flags, and then returns a conditional
+ * to test if the expression was true and for if it was false.
+ *)
+ and munch_cond (T.UNOP (T.BANG, e)) =
+ let
+ val (insns, pos, neg) = munch_cond e
+ in
+ (insns, neg, pos)
+ end
+ | munch_cond (T.BINOP(T.NEQ, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.NE, X.E)
+ | munch_cond (T.BINOP(T.NEQ, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.NE, X.E)
+ | munch_cond (T.BINOP(T.NEQ, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const neq")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.NE, X.E) end
+ | munch_cond (T.BINOP(T.NEQ, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const neq")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.NE, X.E) end
+ | munch_cond (T.BINOP(T.NEQ, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const neq")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.NE, X.E) end
+ | munch_cond (T.BINOP(T.NEQ, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const neq")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.NE, X.E) end
+ | munch_cond (T.BINOP(T.NEQ, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var neq 1"))
+ val t2 = X.TEMP (Temp.new ("var neq 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.NE, X.E)
+ end
+ | munch_cond (T.BINOP(T.EQ, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.E, X.NE)
+ | munch_cond (T.BINOP(T.EQ, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.E, X.NE)
+ | munch_cond (T.BINOP(T.EQ, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const eq")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.E, X.NE) end
+ | munch_cond (T.BINOP(T.EQ, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const eq")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.E, X.NE) end
+ | munch_cond (T.BINOP(T.EQ, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const eq")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.E, X.NE) end
+ | munch_cond (T.BINOP(T.EQ, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const eq")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.E, X.NE) end
+ | munch_cond (T.BINOP(T.EQ, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var eq 1"))
+ val t2 = X.TEMP (Temp.new ("var eq 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.E, X.NE)
+ end
+ | munch_cond (T.BINOP(T.LE, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.LE, X.G)
+ | munch_cond (T.BINOP(T.LE, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.GE, X.L)
+ | munch_cond (T.BINOP(T.LE, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const le")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.GE, X.L) end
+ | munch_cond (T.BINOP(T.LE, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const le")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.LE, X.G) end
+ | munch_cond (T.BINOP(T.LE, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const le")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.GE, X.L) end
+ | munch_cond (T.BINOP(T.LE, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const le")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.LE, X.G) end
+ | munch_cond (T.BINOP(T.LE, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var le 1"))
+ val t2 = X.TEMP (Temp.new ("var le 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.LE, X.G)
+ end
+ | munch_cond (T.BINOP(T.LT, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.L, X.GE)
+ | munch_cond (T.BINOP(T.LT, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.G, X.LE)
+ | munch_cond (T.BINOP(T.LT, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const lt")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.G, X.LE) end
+ | munch_cond (T.BINOP(T.LT, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const lt")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.L, X.GE) end
+ | munch_cond (T.BINOP(T.LT, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const lt")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.G, X.LE) end
+ | munch_cond (T.BINOP(T.LT, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const lt")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.L, X.GE) end
+ | munch_cond (T.BINOP(T.LT, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var lt 1"))
+ val t2 = X.TEMP (Temp.new ("var lt 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.L, X.GE)
+ end
+ | munch_cond (T.BINOP(T.GT, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.G, X.LE)
+ | munch_cond (T.BINOP(T.GT, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.L, X.GE)
+ | munch_cond (T.BINOP(T.GT, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const gt")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.G, X.LE) end
+ | munch_cond (T.BINOP(T.GT, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const gt")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.L, X.GE) end
+ | munch_cond (T.BINOP(T.GT, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const gt")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.G, X.LE) end
+ | munch_cond (T.BINOP(T.GT, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const gt")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.L, X.GE) end
+ | munch_cond (T.BINOP(T.GT, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var gt 1"))
+ val t2 = X.TEMP (Temp.new ("var gt 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.G, X.LE)
+ end
+ | munch_cond (T.BINOP(T.GE, T.TEMP t, T.CONST n)) = ([X.CMP(X.TEMP t, X.CONST n)], X.GE, X.L)
+ | munch_cond (T.BINOP(T.GE, T.CONST n, T.TEMP t)) = ([X.CMP(X.TEMP t, X.CONST n)], X.LE, X.G)
+ | munch_cond (T.BINOP(T.GE, e1, T.CONST n)) =
+ let val t = X.TEMP (Temp.new ("const ge")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.GE, X.L) end
+ | munch_cond (T.BINOP(T.GE, T.CONST n, e1)) =
+ let val t = X.TEMP (Temp.new ("const ge")) in (munch_exp t e1 @ [X.CMP(t, X.CONST n)], X.LE, X.G) end
+ | munch_cond (T.BINOP(T.GE, e1, T.TEMP t)) =
+ let val t1 = X.TEMP (Temp.new ("const ge")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.GE, X.L) end
+ | munch_cond (T.BINOP(T.GE, T.TEMP t, e1)) =
+ let val t1 = X.TEMP (Temp.new ("const ge")) in (munch_exp t1 e1 @ [X.CMP(t1, X.TEMP t)], X.LE, X.G) end
+ | munch_cond (T.BINOP(T.GE, e1, e2)) =
+ let
+ val t1 = X.TEMP (Temp.new ("var ge 1"))
+ val t2 = X.TEMP (Temp.new ("var ge 2"))
+ in
+ (munch_exp t1 e1 @ munch_exp t2 e2 @
+ [X.CMP(t1, t2)], X.GE, X.L)
+ end
+ | 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"))
+ val t2 = X.TEMP (Temp.new("logor c 2"))
+ val l = Label.new ()
+ in
+ if (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.SIZE (X.Byte, X.TEST (t1, t1))],
+ X.NE, X.E)
+ else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.SIZE(X.Byte, 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"))
+ val t2 = X.TEMP (Temp.new("logand c 2"))
+ val l = Label.new ()
+ in
+ if (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.SIZE (X.Byte, X.TEST (t1, t1))],
+ X.NE, X.E)
+ else (insn1 @ [X.SETcc (pos1, t1)] @ insn2 @ [X.SETcc (pos2, t2), X.SIZE(X.Byte, X.AND(t1, t2))], X.NE, X.E)
+ end
+ | munch_cond e =
+ let
+ val t = X.TEMP (Temp.new ("munch c"))
+ in
+ (munch_exp t e @ [ X.TEST (t,t) ], X.NE, X.E)
+ end
- (* munch_stm : T.stm -> AS.instr list *)
+ (* munch_stm : T.stm -> X.insn list *)
(* munch_stm stm generates code to execute stm *)
- fun munch_stm (T.MOVE(T.TEMP(t1), e2)) =
- munch_exp (X.TEMP t1) e2
+ fun munch_stm (T.MOVE (T.TEMP t, a as T.TEMP _)) = munch_exp (X.TEMP t) a
+ | munch_stm (T.MOVE (T.TEMP t, a as T.CONST _)) = munch_exp (X.TEMP t) a
+ | munch_stm (T.MOVE (T.TEMP t, a as T.ARG _)) = munch_exp (X.TEMP t) a
+ | munch_stm (T.MOVE (T.TEMP t, a as T.CALL _)) = munch_exp (X.TEMP t) a
+ | munch_stm (T.MOVE(T.TEMP t1, e2)) =
+ let
+ val t = Temp.new ("assign")
+ in
+ munch_exp (X.TEMP t) e2
+ @ [X.MOV(X.TEMP t1, X.TEMP t)]
+ end
| munch_stm (T.MOVE(_, _)) =
raise ErrorMsg.InternalError "Incorrect first operand for T.MOVE?"
| munch_stm (T.RETURN(e)) =
let
- val t = Temp.new ()
+ val t = Temp.new ("retval")
in
munch_exp (X.TEMP t) e
- @ [X.MOVL(X.REG X.EAX, X.TEMP t), X.RET]
+ @ [X.MOV(X.REG X.EAX, X.TEMP t), X.RET]
end
+ | munch_stm (T.LABEL(l)) = [X.LABEL l]
+ | munch_stm (T.JUMP(l)) = [X.JMP l]
+ | munch_stm (T.JUMPIFN(e, l)) =
+ let
+ val (insns, pos, neg) = munch_cond e
+ in
+ insns @ [X.Jcc (neg, l)]
+ end
fun codegen nil = nil
| codegen (stm::stms) = munch_stm stm @ codegen stms
git.joshuawise.com / snipe.git / blobdiff