-(* L2 Compiler
+(* L3 Compiler
* Takes a list of mappings of temporaries to colors and a pseudoasm listing,
* then produces x86 code.
* Author: Chris Lu <czl@andrew.cmu.edu>
if (n > maxreg)
then raise Spilled
else X.numtoreg n
-
+
fun temptonum (t: T.temp) : int =
(List.hd
(List.map (fn (_, n) => n)
- (List.filter (fn (a, _) => (Temp.compare (a, t) = EQUAL)) regmap)))
+ (List.filter (fn (a, _) => (Temp.eq (a, t))) regmap)))
fun temptoreg (t: T.temp) : x86.reg =
numtoreg (temptonum t)
- handle Empty =>
- (ErrorMsg.warn NONE ("Uncolored temp "^(Temp.name t)^" -- dead code?") ;
- X.R15D) (*If we don't care about the output, then it is cool to explode this; R15D is guaranteed not to be used across builtin blocks.*)
-
- val spillreg1 = X.R14D
-
- val prologue = [X.DIRECTIVE "\tpush %rbx\n\tpush %r12\n\tpush %r13\n\tpush %r14\n\tpush %r15"] (* Could be done better. *)
- val epilogue = [X.DIRECTIVE "\tpop %r15\n\tpop %r14\n\tpop %r13\n\tpop %r12\n\tpop %rbx"]
-
- val numreg = foldr (Int.max) 0 (map (fn (_, n) => n) regmap) (* Number of registers used. *)
- val nspilled = Int.max (numreg - maxreg, 0) (* Number of spilled registers. *)
- fun isspilled (X.TEMP temp) = (((temptonum temp) > maxreg) handle Empty => false) (* Whether a register is spilled *)
+ handle Empty => raise ErrorMsg.InternalError ("Uncolored temp "^(Temp.name t)^", agh!")
+
+ val spillreg1 = X.R15D
+ val spillreg2 = X.R14D
+
+ (* Determine which need to be saved. *)
+ val opsused = (map (fn (_, n) => X.REG (numtoreg n handle Spilled => X.R15D)) regmap) @ [X.REG X.R14D]
+ val saveregs = X.OperSet.intersection (
+ X.OperSet.addList (X.OperSet.empty, opsused),
+ X.OperSet.addList (
+ X.OperSet.empty,
+ [X.REG X.EBX,
+ X.REG X.EBP,
+ X.REG X.R12D,
+ X.REG X.R13D,
+ X.REG X.R14D,
+ X.REG X.R15D]))
+ val savelist = X.OperSet.listItems saveregs
+ val nsave = length savelist
+
+ val numreg = foldr (Int.max) 0 (map (fn (_, n) => n) regmap) (* Number of registers used. *)
+ val nspilled = Int.max (numreg - maxreg, 0) (* Number of spilled registers. *)
+ fun isspilled (X.TEMP temp) = (temptonum temp) > maxreg (* Whether a register is spilled *)
+ | isspilled (X.STACKARG _) = true
+ | isspilled (X.REL _) = true
+ | isspilled (X.OSIZE (_, oo)) = isspilled oo
| isspilled _ = false
- fun stackpos (reg: int) = (reg - maxreg) * ~4 (* Stack position of some register number *)
-
- fun spill (X.TEMP temp, xreg: x86.reg) = (* Spill a register if need be. *)
+ val stacksz = (nspilled + nsave) * 8
+ fun stackpos (reg: int) = stacksz - (reg - maxreg + nsave) * 8 (* Stack position of some register number *)
+
+ val prologue =
+ (X.SUB (X.OSIZE (X.Qword, X.REG X.RSP), X.CONST (Word32.fromInt stacksz))) ::
+ (ListPair.map
+ (fn (num, reg) =>
+ X.MOV (X.OSIZE (X.Qword, X.REL (X.REG X.RSP, X.CONST (Word32.fromInt (stacksz - 8*(num+1))))), X.OSIZE (X.Qword, reg)))
+ (List.tabulate (nsave, fn x => x), savelist))
+ val epilogue =
+ (ListPair.map
+ (fn (num, reg) =>
+ X.MOV (X.OSIZE (X.Qword, reg), X.REL (X.REG X.RSP, X.CONST (Word32.fromInt (stacksz - 8*(num+1))))))
+ (List.tabulate (nsave, fn x => x), savelist)) @
+ [X.ADD (X.OSIZE (X.Qword, X.REG X.RSP), X.CONST (Word32.fromInt stacksz))]
+ val endlbl = Label.new()
+
+ fun spill s (X.TEMP temp, xreg: x86.reg) = (* Spill a register if need be. *)
if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REL (X.RSP, stackpos (temptonum temp)), X.REG xreg)]
+ then [X.MOV (X.OSIZE(s, X.REL (X.REG X.RSP, (X.CONST o Word32.fromInt o stackpos o temptonum) temp)), X.REG xreg)]
else nil
- | spill _ = nil (* Nothing else can be spilled. *)
- fun unspill (X.TEMP temp, xreg: x86.reg) = (* Unspill a register if need be. *)
+ | spill s (X.STACKARG _, _) = raise ErrorMsg.InternalError "Cannot spill to a stack arg"
+ | spill s (a as X.REL _, xreg) = [X.MOV (X.OSIZE(s,a), X.REG xreg)]
+ | spill s (X.OSIZE (s', oo), xreg) = spill s' (X.stripsize oo, xreg)
+ | spill _ _ = nil (* Nothing else can be spilled. *)
+ fun unspill s (X.TEMP temp, xreg: x86.reg) = (* Unspill a register if need be. *)
if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REG xreg, X.REL (X.RSP, stackpos (temptonum temp)))]
+ then [X.MOV (X.OSIZE(s, X.REG xreg), X.REL (X.REG X.RSP, (X.CONST o Word32.fromInt o stackpos o temptonum) temp))]
else nil
- | unspill _ = nil
+ | unspill s (X.STACKARG arg, xreg) = [X.MOV (X.OSIZE(s, X.REG xreg), X.REL (X.REG X.RSP, X.CONST (Word32.fromInt (stacksz + 8 + (arg * 8)))))]
+ | unspill s (a as X.REL _, xreg) = [X.MOV (X.OSIZE(s, X.REG xreg), a)]
+ | unspill s (X.OSIZE (s', oo), xreg) = unspill s' (X.stripsize oo, xreg)
+ | unspill _ _ = nil
- fun realoper (X.TEMP temp) = X.REG (temptoreg temp) (* Makes a operand 'real'. *)
+ fun realoper (X.TEMP temp) = X.OSIZE (X.sts (Temp.size temp), X.REG (temptoreg temp)) (* Makes a operand 'real'. *)
+ | realoper (X.STACKARG arg) = raise Spilled
+ | realoper (X.REL _) = raise Spilled
+ | realoper (X.OSIZE (s, oo)) = X.OSIZE (s, realoper (X.stripsize oo))
| realoper r = r
+
fun stackoper (X.TEMP temp) =
if not (isspilled (X.TEMP temp)) then raise ErrorMsg.InternalError "stackoper on unspilled temp?"
- else X.REL (X.RSP, stackpos (temptonum temp))
+ else X.OSIZE (X.sts (Temp.size temp), X.REL (X.REG X.RSP, (X.CONST o Word32.fromInt o stackpos o temptonum) temp))
+ | stackoper (X.STACKARG arg) = X.REL (X.REG X.RSP, (X.CONST o Word32.fromInt) (stacksz + 8 + (arg * 8)))
+ | stackoper (a as X.REL _) = a
+ | stackoper (X.OSIZE (s, oo)) = X.OSIZE (s, stackoper (X.stripsize oo))
| stackoper _ = raise ErrorMsg.InternalError "stackoper on not temp?"
-
+
+ fun ophit (X.OSIZE (s, oo)) = let val (insns, p) = ophit (X.stripsize oo) in (insns, X.OSIZE (s, p)) end
+ | ophit (X.REL(op1, op2)) =
+ let
+ val t1 = X.stripsize op1
+ val (s, t2) = X.sizeoper op2
+ in
+ if (isspilled t1 andalso isspilled t2) then
+ ([X.MOV (X.OSIZE (s, X.REG spillreg1), stackoper t2),
+ X.ADD (X.OSIZE (X.Qword, X.REG spillreg1), stackoper t1)],
+ X.REL (X.REG spillreg1, X.CONST 0w0))
+ else if(isspilled t1) then
+ ([X.MOV (X.OSIZE (X.Qword, X.REG spillreg1), stackoper t1)],
+ X.REL (X.REG spillreg1, realoper t2))
+ else if(isspilled t2) then
+ ([X.MOV (X.OSIZE (s, X.REG spillreg1), stackoper t2)],
+ X.REL (realoper t1, X.REG spillreg1))
+ else
+ ([],
+ X.REL (realoper t1, realoper t2))
+ end
+ | ophit a = (nil, realoper a handle Spilled => stackoper a)
+
fun transform (X.DIRECTIVE s) = [X.DIRECTIVE s]
| transform (X.COMMENT s) = [X.COMMENT s]
- | transform (X.MOVL (dest, src)) =
- if (isspilled dest)
- then
- unspill (src, spillreg1) @
- [ X.MOVL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- else
- [ X.MOVL(
- realoper dest handle Spilled => raise ErrorMsg.InternalError "But we said that wasn't spilled?",
- realoper src handle Spilled => stackoper src)]
- | transform (X.SUBL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.SUBL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
+ | transform (X.LIVEIGN a) = transform a
+ | transform (X.MOV (dest, src)) =
+ let
+ val (insns1, realop1) = ophit dest
+ val (insns2, realop2) = ophit src
+ in
+ if(isspilled dest andalso isspilled src) then
+ insns2 @ [X.MOV (X.REG spillreg2, realop2)] @ insns1 @ [X.MOV (realop1, X.REG spillreg2)]
+ else
+ insns1 @ insns2 @ [X.MOV (realop1, realop2)]
+ end
+ | transform (X.LEA (dest, src)) =
+ let
+ val (insns1, realop1) = ophit dest
+ val (insns2, realop2) = ophit src
+ in
+ if(isspilled dest andalso isspilled src) then
+ insns2 @ [X.MOV (X.REG spillreg2, realop2)] @ insns1 @ [X.LEA (realop1, X.REG spillreg2)]
+ else
+ insns1 @ insns2 @ [X.LEA (realop1, realop2)]
+ end
+ | transform (X.SUB (dest, src)) =
+ let
+ val (insns, realop) = ophit dest
+ in
+ unspill X.Long (src, spillreg2) @ insns @
+ [ X.SUB(realop,
+ realoper src handle Spilled => X.REG spillreg2)]
+ end
| transform (X.IMUL (dest, src)) =
- unspill (dest, spillreg1) @
+ unspill X.Long (dest, spillreg1) @
[ X.IMUL(
realoper dest handle Spilled => X.REG spillreg1,
realoper src handle Spilled => stackoper src)] @
- spill (dest, spillreg1)
+ spill X.Long (dest, spillreg1)
| transform (X.IMUL3 (dest, src, const)) =
+ unspill X.Long ((X.stripsize src), spillreg2) @
[ X.IMUL3(
realoper dest handle Spilled => X.REG spillreg1,
- realoper src handle Spilled => stackoper src,
+ realoper src handle Spilled => X.REG spillreg2,
const)] @
- spill (dest, spillreg1)
- | transform (X.ADDL (dest, src)) = (* You can have either operand spilled, but not both. Pick one. *)
- if (isspilled dest)
- then
- unspill (src, spillreg1) @
- [ X.ADDL(
- realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- else
- [ X.ADDL(
- realoper dest handle Spilled => raise ErrorMsg.InternalError "But we said that wasn't spilled?",
- realoper src handle Spilled => stackoper src)]
- | transform (X.IDIVL (src)) = [ X.IDIVL(realoper src handle Spilled => stackoper src)]
+ spill X.Long (dest, spillreg1)
+ | transform (X.ADD (dest, src)) =
+ let
+ val (insns, realop) = ophit dest
+ in
+ unspill X.Long (src, spillreg2) @ insns @
+ [ X.ADD(realop,
+ realoper src handle Spilled => X.REG spillreg2)]
+ end
+ | transform (X.IDIV (src)) = [ X.IDIV(realoper src handle Spilled => stackoper src)]
| transform (X.NEG (src)) = [ X.NEG(realoper src handle Spilled => stackoper src)]
- | transform (X.NOTL (src)) = [ X.NOTL(realoper src handle Spilled => stackoper src)]
- | transform (X.SALL (dest, shft)) =
- [ X.SALL (
+ | transform (X.NOT (src)) = [ X.NOT(realoper src handle Spilled => stackoper src)]
+ | transform (X.SAL (dest, shft)) =
+ [ X.SAL (
realoper dest handle Spilled => stackoper dest,
shft)]
- | transform (X.SARL (dest, shft)) =
- [ X.SARL (
+ | transform (X.SAR (dest, shft)) =
+ [ X.SAR (
realoper dest handle Spilled => stackoper dest,
shft)]
| transform (X.CLTD) = [ X.CLTD ]
- | transform (X.ANDL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.ANDL(
+ | transform (X.AND (dest, src)) =
+ unspill X.Long (src, spillreg1) @
+ [ X.AND(
realoper dest handle Spilled => stackoper dest,
realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.ORL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.ORL(
+ | transform (X.OR (dest, src)) =
+ unspill X.Long (src, spillreg1) @
+ [ X.OR(
realoper dest handle Spilled => stackoper dest,
realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.XORL (dest, src)) =
- unspill (src, spillreg1) @
- [ X.XORL(
+ | transform (X.XOR (dest, src)) =
+ unspill X.Long (src, spillreg1) @
+ [ X.XOR(
realoper dest handle Spilled => stackoper dest,
realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.CMPL (op1, op2)) =
- unspill (op2, spillreg1) @
- [ X.CMPL(
+ | transform (X.CMP (op1, op2)) =
+ unspill X.Long (op2, spillreg1) @
+ [ X.CMP(
realoper op1 handle Spilled => stackoper op1,
realoper op2 handle Spilled => X.REG spillreg1)]
| transform (X.TEST (op1, op2)) =
- unspill (op2, spillreg1) @
+ unspill X.Long (op2, spillreg1) @
[ X.TEST(
realoper op1 handle Spilled => stackoper op1,
realoper op2 handle Spilled => X.REG spillreg1)]
- | transform (X.SETNE (src)) = [ X.SETNE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETE (src)) = [ X.SETE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETLE (src)) = [ X.SETLE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETL (src)) = [ X.SETL(realoper src handle Spilled => stackoper src)]
- | transform (X.SETGE (src)) = [ X.SETGE(realoper src handle Spilled => stackoper src)]
- | transform (X.SETG (src)) = [ X.SETG(realoper src handle Spilled => stackoper src)]
- | transform (X.MOVZBL (dest, src)) =
- [ X.MOVZBL(
+ | transform (X.SETcc (c,src)) = [ X.SETcc(c, realoper src handle Spilled => stackoper src)]
+ | transform (X.CALL l) = [ X.CALL l ]
+ | transform (X.MOVZB (dest, src)) =
+ [ X.MOVZB(
realoper dest handle Spilled => X.REG spillreg1,
realoper src handle Spilled => stackoper src)]
- @ spill (dest, spillreg1)
- | transform (X.RET) = epilogue @ [X.RET]
+ @ spill X.Long (dest, spillreg1)
+ | transform (X.RET) = if nsave < 2 then (epilogue @ [X.RET]) else [X.JMP endlbl]
| transform (X.LABEL l) = [ X.LABEL l ]
| transform (X.JMP l) = [ X.JMP l ]
- | transform (X.JE l) = [ X.JE l]
- | transform (X.JNE l) = [ X.JNE l]
-(* | transform _ = raise ErrorMsg.InternalError ("Unimplemented transform")*)
+ | transform (X.Jcc (c,l)) = [X.Jcc (c,l)]
in
- List.concat (prologue :: (map transform instrs))
-
+ if (nsave < 2) then
+ List.concat (prologue :: (map transform instrs))
+ else
+ List.concat (prologue :: ((map transform instrs) @ [[X.LABEL endlbl], epilogue, [X.RET]]))
end
end