-(* 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>
type asm = x86.insn list
exception Spilled
-
+
+ structure TempMap = SplayMapFn(struct
+ type ord_key = Temp.temp
+ val compare = Temp.compare
+ end)
+ structure Tm = Temp
+
fun solidify (regmap : colorings) (instrs : asm) : asm =
let
(* r14d and r15d is reserved for spilling *)
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)))
-
+
+ val tempnums = List.foldr (fn ((t,n),b) => TempMap.insert(b,t,n)) (TempMap.empty) regmap
+ fun temptonum (t: T.temp) : int = valOf (TempMap.find (tempnums, t))
+
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 _ = 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. *)
- if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REL (X.RSP, stackpos (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. *)
- if (isspilled (X.TEMP temp))
- then [X.MOVL (X.REG xreg, X.REL (X.RSP, stackpos (temptonum temp)))]
- else nil
+
+ 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.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stacksz), Tm.Quad))) ::
+ (ListPair.map
+ (fn (num, reg) =>
+ X.MOV ((X.REL ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt (stacksz - 8*(num+1))), Tm.Quad), 0w1), Tm.Quad), (reg, Tm.Quad)))
+ (List.tabulate (nsave, fn x => x), savelist))
+ val epilogue =
+ (ListPair.map
+ (fn (num, reg) =>
+ X.MOV ((reg, Tm.Quad), (X.REL ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt (stacksz - 8*(num+1))), Tm.Quad), 0w1), Tm.Quad)))
+ (List.tabulate (nsave, fn x => x), savelist)) @
+ [X.ADD ((X.REG X.RSP, Tm.Quad), (X.CONST (Word32.fromInt stacksz), Tm.Quad))]
+ val endlbl = Label.new()
+
+ fun spill ((X.TEMP temp, s), xreg: x86.reg) = (* Spill a register if need be. *)
+ let
+ val base = (X.REG X.RSP, Tm.Quad)
+ val offs = (X.CONST (Word32.fromInt (stackpos (temptonum temp))), Tm.Quad)
+ in
+ if (isspilled (X.TEMP temp, s))
+ then [X.MOV ((X.REL (base, offs, 0w1), Tm.Quad), (X.REG xreg, Tm.Quad))]
+ else nil
+ end
+ | spill ((X.STACKARG _, s), _) = raise ErrorMsg.InternalError "Cannot spill to a stack arg"
+ | spill ((a as X.REL _, s), xreg) = [X.MOV ((a,s), (X.REG xreg,s))]
+ | spill _ = nil (* Nothing else can be spilled. *)
+ fun unspill ((X.TEMP temp, s), xreg: x86.reg) = (* Unspill a register if need be. *)
+ let
+ val base = (X.REG X.RSP, Tm.Quad)
+ val offs = (X.CONST (Word32.fromInt (stackpos (temptonum temp))), Tm.Quad)
+ in
+ if (isspilled (X.TEMP temp, s))
+ then [X.MOV ((X.REG xreg, Tm.Quad), (X.REL (base, offs, 0w1), Tm.Quad))]
+ else nil
+ end
+ | unspill ((X.STACKARG arg, s), xreg) =
+ let
+ val base = (X.REG X.RSP, Tm.Quad)
+ val offs = (X.CONST (Word32.fromInt (stacksz + 8 + (arg * 8))), Tm.Quad)
+ in
+ [X.MOV ((X.REG xreg, s), (X.REL (base, offs, 0w1), s))]
+ end
+ | unspill ((a as X.REL _, s), xreg) = [X.MOV ((X.REG xreg, s), (a,s))]
| unspill _ = nil
-
- fun realoper (X.TEMP temp) = X.REG (temptoreg temp) (* Makes a operand 'real'. *)
+
+ fun realoper (X.TEMP temp, s) = (X.REG (temptoreg temp), s) (* makes an operand 'real' *)
+ | realoper (X.STACKARG arg, _) = raise Spilled
+ | realoper (X.REL _, _) = raise Spilled
| 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))
- | stackoper _ = raise ErrorMsg.InternalError "stackoper on not temp?"
-
+
+ fun stackoper (X.TEMP temp, s) =
+ let
+ val base = (X.REG X.RSP, Tm.Quad)
+ val offs = (X.CONST (Word32.fromInt (stackpos (temptonum temp))), Tm.Quad)
+ in
+ if (isspilled (X.TEMP temp, s))
+ then (X.REL (base, offs, 0w1), s)
+ else raise ErrorMsg.InternalError "stackoper on unspilled temp?"
+ end
+ | stackoper (X.STACKARG arg, s) =
+ let
+ val base = (X.REG X.RSP, Tm.Quad)
+ val offs = (X.CONST (Word32.fromInt (stacksz + 8 + (arg * 8))), Tm.Quad)
+ in
+ (X.REL (base, offs, 0w1), s)
+ end
+ | stackoper (a as (X.REL _, s)) = a
+ | stackoper (a as (X.CONST _, s)) = a
+ | stackoper anous = raise ErrorMsg.InternalError ("stackoper on not temp " ^ X.pp_oper anous)
+
+ fun ophit (X.REL(op1, op2, m), s) =
+ if (isspilled op1 andalso isspilled op2) then
+ ([X.MOV ((X.REG spillreg1, Tm.Long), stackoper op2),
+ X.IMUL((X.REG spillreg1, Tm.Quad), (X.CONST m, Tm.Quad)),
+ X.ADD ((X.REG spillreg1, Tm.Quad), stackoper op1)],
+ (X.REL ((X.REG spillreg1, Tm.Quad), (X.CONST 0w0, Tm.Quad), 0w1), s))
+ else if(isspilled op1) then
+ ([X.MOV ((X.REG spillreg1, Tm.Quad), stackoper op1)],
+ (X.REL ((X.REG spillreg1, Tm.Quad), realoper op2, m), s))
+ else if(isspilled op2) then
+ ([X.MOV ((X.REG spillreg1, Tm.Long), stackoper op2)],
+ (X.REL (realoper op1, (X.REG spillreg1, Tm.Quad), m), s))
+ else
+ ([],
+ (X.REL (realoper op1, realoper op2, m), s))
+ | 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 as (_,s1)) = ophit dest
+ val (insns2, realop2 as (_,s2)) = ophit src
+ in
+ if(isspilled dest andalso isspilled src) then
+ insns2 @ [X.MOV ((X.REG spillreg2, s2), realop2)] @ insns1 @ [X.MOV (realop1, (X.REG spillreg2, s1))]
+ else
+ insns1 @ insns2 @ [X.MOV (realop1, realop2)]
+ end
+ | transform (X.LEA (dest, src)) =
+ let
+ val (insns1, realop1 as (_,s1)) = ophit dest
+ val (insns2, realop2 as (_,s2)) = ophit src
+ in
+ if(isspilled dest andalso isspilled src) then
+ insns2 @ [X.LEA ((X.REG spillreg2, s2), realop2)] @ insns1 @ [X.MOV (realop1, (X.REG spillreg2, s1))]
+ else
+ insns1 @ insns2 @ [X.LEA (realop1, realop2)]
+ end
+ | transform (X.SUB (dest, src)) =
+ let
+ val (insns, realop) = ophit dest
+ in
+ unspill (src, spillreg2) @ insns @
+ [ X.SUB(realop,
+ realoper src handle Spilled => (X.REG spillreg2, X.osize realop))]
+ end
| transform (X.IMUL (dest, src)) =
unspill (dest, spillreg1) @
[ X.IMUL(
- realoper dest handle Spilled => X.REG spillreg1,
+ realoper dest handle Spilled => (X.REG spillreg1, X.osize dest),
realoper src handle Spilled => stackoper src)] @
spill (dest, spillreg1)
| transform (X.IMUL3 (dest, src, const)) =
+ unspill (src, spillreg2) @
[ X.IMUL3(
- realoper dest handle Spilled => X.REG spillreg1,
- realoper src handle Spilled => stackoper src,
+ realoper dest handle Spilled => (X.REG spillreg1, X.osize dest),
+ realoper src handle Spilled => (X.REG spillreg2, X.osize src),
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)]
+ | transform (X.ADD (dest, src)) =
+ let
+ val (insns, realop) = ophit dest
+ in
+ unspill (src, spillreg2) @ insns @
+ [ X.ADD(realop,
+ realoper src handle Spilled => (X.REG spillreg2, X.osize realop))]
+ 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)) =
+ | transform (X.AND (dest, src)) =
unspill (src, spillreg1) @
- [ X.ANDL(
+ [ X.AND(
realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.ORL (dest, src)) =
+ realoper src handle Spilled => (X.REG spillreg1, X.osize src))]
+ | transform (X.OR (dest, src)) =
unspill (src, spillreg1) @
- [ X.ORL(
+ [ X.OR(
realoper dest handle Spilled => stackoper dest,
- realoper src handle Spilled => X.REG spillreg1)]
- | transform (X.XORL (dest, src)) =
+ realoper src handle Spilled => (X.REG spillreg1, X.osize src))]
+ | transform (X.XOR (dest, src)) =
unspill (src, spillreg1) @
- [ X.XORL(
+ [ 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(
- realoper op1 handle Spilled => stackoper op1,
- realoper op2 handle Spilled => X.REG spillreg1)]
+ realoper src handle Spilled => (X.REG spillreg1, X.osize src))]
+ | transform (X.CMP (op1, op2)) =
+ let
+ val (insns1, realop1) = ophit op1
+ in
+ if(isspilled realop1 andalso isspilled op2) then
+ unspill (op2, spillreg2) @ insns1 @ [X.CMP (realop1, (X.REG spillreg2, X.osize realop1))]
+ else
+ insns1 @ [X.CMP (realop1, realoper op2 handle Spilled => stackoper op2)]
+ end
| transform (X.TEST (op1, op2)) =
unspill (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(
- realoper dest handle Spilled => X.REG spillreg1,
+ realoper op2 handle Spilled => (X.REG spillreg1, X.osize op2))]
+ | transform (X.SETcc (c,src)) = [ X.SETcc(c, realoper src handle Spilled => stackoper src)]
+ | transform (X.CMOVcc (c, 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, X.osize src), realop2)] @ insns1 @ [X.CMOVcc (c, realop1, (X.REG spillreg2, X.osize src))]
+ else
+ insns1 @ insns2 @ [X.CMOVcc (c, realop1, realop2)]
+ end
+ | transform (X.CALL l) = [ X.CALL l ]
+ | transform (X.MOVZB (dest, src)) =
+ [ X.MOVZB(
+ realoper dest handle Spilled => (X.REG spillreg1, X.osize dest),
realoper src handle Spilled => stackoper src)]
@ spill (dest, spillreg1)
- | transform (X.RET) = epilogue @ [X.RET]
+ | 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)]
+ | transform _ = raise ErrorMsg.InternalError "probably movsc: unimplemented"
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
git.joshuawise.com / snipe.git / blobdiff