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|
(*
* This functor factors out the machine independent part of the register
* allocator. It performs integer and floating register allocation.
* This works well for RISC machines; but not applicable to x86.
*)
functor RISC_RA
(structure I : INSTRUCTIONS
structure Asm : INSTRUCTION_EMITTER (* where I = I *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
structure CFG : CONTROL_FLOW_GRAPH (* where I = I and P = Asm.S.P *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
where type P.Client.pseudo_op = Asm.S.P.Client.pseudo_op
and type P.T.Basis.cond = Asm.S.P.T.Basis.cond
and type P.T.Basis.div_rounding_mode = Asm.S.P.T.Basis.div_rounding_mode
and type P.T.Basis.ext = Asm.S.P.T.Basis.ext
and type P.T.Basis.fcond = Asm.S.P.T.Basis.fcond
and type P.T.Basis.rounding_mode = Asm.S.P.T.Basis.rounding_mode
and type P.T.Constant.const = Asm.S.P.T.Constant.const
and type ('s,'r,'f,'c) P.T.Extension.ccx = ('s,'r,'f,'c) Asm.S.P.T.Extension.ccx
and type ('s,'r,'f,'c) P.T.Extension.fx = ('s,'r,'f,'c) Asm.S.P.T.Extension.fx
and type ('s,'r,'f,'c) P.T.Extension.rx = ('s,'r,'f,'c) Asm.S.P.T.Extension.rx
and type ('s,'r,'f,'c) P.T.Extension.sx = ('s,'r,'f,'c) Asm.S.P.T.Extension.sx
and type P.T.I.div_rounding_mode = Asm.S.P.T.I.div_rounding_mode
and type P.T.Region.region = Asm.S.P.T.Region.region
and type P.T.ccexp = Asm.S.P.T.ccexp
and type P.T.fexp = Asm.S.P.T.fexp
(* and type P.T.labexp = Asm.S.P.T.labexp *)
and type P.T.mlrisc = Asm.S.P.T.mlrisc
and type P.T.oper = Asm.S.P.T.oper
and type P.T.rep = Asm.S.P.T.rep
and type P.T.rexp = Asm.S.P.T.rexp
and type P.T.stm = Asm.S.P.T.stm
structure InsnProps : INSN_PROPERTIES (* where I = I *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
structure Rewrite : REWRITE_INSTRUCTIONS (* where I = I *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
structure SpillInstr : ARCH_SPILL_INSTR (* where I = I *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
(* Spilling heuristics determines which node should be spilled.
* You can use Chaitin, ChowHenessey, or one of your own.
*)
structure SpillHeur : RA_SPILL_HEURISTICS
(* The Spill module figures out the strategies for inserting
* spill code. You can use RASpill, or RASpillWithRenaming,
* or write your own if you are feeling adventurous.
*)
structure Spill : RA_SPILL (* where I = I *)
where type I.addressing_mode = I.addressing_mode
and type I.ea = I.ea
and type I.instr = I.instr
and type I.instruction = I.instruction
and type I.operand = I.operand
val architecture : string
(* Is this a pure instruction *)
val pure : I.instruction -> bool
datatype spillOperandKind = SPILL_LOC | CONST_VAL
type spill_info (* user-defined abstract type *)
(* Called before RA begins *)
val beforeRA : CFG.cfg -> spill_info
structure Int :
sig
val avail : CellsBasis.cell list (* list of available registers *)
val dedicated : CellsBasis.cell list (* list of registers that are dedicated *)
val spillLoc :
{ info:spill_info,
an :Annotations.annotations ref,
cell:CellsBasis.cell, (* spilled cell *)
id :RAGraph.logical_spill_id
}
-> { opnd: I.ea,
kind: spillOperandKind
}
(* Mode for RA optimizations *)
val mode : RAGraph.mode
end
structure Float :
sig
val avail : CellsBasis.cell list (* list of available registers *)
val dedicated : CellsBasis.cell list (* list of registers that are dedicated *)
val spillLoc :
spill_info * Annotations.annotations ref * RAGraph.logical_spill_id
-> I.ea
(* Mode for RA optimizations *)
val mode : RAGraph.mode
end
) : CFG_OPTIMIZATION =
struct
structure CFG = CFG
structure I = CFG.I
structure P = InsnProps
structure C = I.C
structure G = RAGraph
structure CB = CellsBasis
(* The generic register allocator *)
structure Ra =
RegisterAllocator
(structure SpillHeuristics = SpillHeur
(* (ChowHennessySpillHeur) *)
structure Flowgraph = ClusterRA
(structure Flowgraph = CFG
structure Asm = Asm
structure InsnProps = InsnProps
structure Spill = Spill
)
)
val name = "RISC_RA"
(* Counters for register allocation *)
val intSpillsCnt = MLRiscControl.mkCounter ("ra-int-spills", "RA int spill count")
val intReloadsCnt = MLRiscControl.mkCounter ("ra-int-reloads", "RA int reload count")
val intRenamesCnt = MLRiscControl.mkCounter ("ra-int-renames", "RA int rename count")
val floatSpillsCnt = MLRiscControl.mkCounter ("ra-float-spills", "RA float spill count")
val floatReloadsCnt = MLRiscControl.mkCounter ("ra-float-reloads", "RA float reload count")
val floatRenamesCnt = MLRiscControl.mkCounter ("ra-float-renames", "RA float rename count")
fun inc c = c := !c + 1
fun error msg = MLRiscErrorMsg.error("RISC RA "^architecture,msg)
(*
* Make arithmetic non-overflow trapping.
* This makes sure that if we happen to run the compiler for a long
* period of time overflowing counters will not crash the compiler.
*)
fun x + y = Word.toIntX(Word.+(Word.fromInt x, Word.fromInt y))
fun x - y = Word.toIntX(Word.-(Word.fromInt x, Word.fromInt y))
(* GetReg specialized to integer and floating point registers *)
fun isDedicated (len, arr, others) r =
(r < len andalso Array.sub(arr, r)) orelse List.exists (fn d => r = d) others
fun mark(arr, _, [], others) = others
| mark(arr, len, r::rs, others) = let
val r = CellsBasis.registerId r
in
if r >= len then mark(arr, len, rs, r::others)
else (Array.update(arr, r, true); mark(arr, len, rs, others))
end
fun annotate([], i) = i
| annotate(a::an, i) = annotate(an, I.ANNOTATION{a=a, i=i})
local
val {low,high} = C.cellRange CellsBasis.GP
val arr = Array.array(high+1,false)
val others = mark(arr, high+1, Int.dedicated, [])
in
structure GR = GetReg(val first=low val nRegs=high-low+1
val available=map CellsBasis.registerId Int.avail)
val dedicatedR : int -> bool = isDedicated (high+1, arr, others)
end
fun getRegLoc(S, an, cell, Ra.FRAME loc) =
Int.spillLoc{info=S, an=an, cell=cell, id=loc}
| getRegLoc _ = error "getRegLoc"
fun copy((rds as [d], rss as [s]), I.COPY{sz, ...}) =
if CB.sameColor(d,s) then []
else [I.COPY{k=CB.GP, sz=sz, dst=rds, src=rss, tmp=NONE}]
| copy((rds, rss), I.COPY{tmp, sz, ...}) =
[I.COPY{k=CB.GP, sz=sz, dst=rds, src=rss, tmp=tmp}]
| copy _ = error "copy: COPY?"
fun spillR S {annotations, kill=true, reg, spillLoc, instr} =
if pure instr then {code=[], proh=[], newReg=NONE}
else spillR S {annotations=annotations,kill=false,
spillLoc=spillLoc,
reg=reg,instr=instr}
| spillR S {annotations=an, kill, reg, spillLoc, instr} = let
fun annotate([], i) = i
| annotate(a::an, i) = annotate(an, I.ANNOTATION{a=a, i=i})
(* preserve annotation on instruction *)
fun spill(instrAn, I.ANNOTATION{a, i}) = spill(a::instrAn, i)
| spill(instrAn, I.KILL{regs, spilled}) =
{code=
[annotate
(instrAn,
I.KILL {regs=C.rmvReg(reg, regs),
spilled=C.addReg(reg, spilled)})],
proh = [],
newReg=NONE}
| spill(instrAn, I.LIVE _) = error "spillR: LIVE"
| spill(_, I.COPY _) = error "spillR: COPY"
| spill(instrAn, I.INSTR _) = let
val {opnd=spillLoc:I.ea, kind} = getRegLoc (S, an, reg, spillLoc)
in
inc intSpillsCnt;
SpillInstr.spill CB.GP (instr, reg, spillLoc)
end
in spill([], instr)
end
(* spill src at the spill location for reg i.e. spillLoc *)
fun spillReg S {annotations=an,src,reg,spillLoc} =
(inc intSpillsCnt;
#code(SpillInstr.spillToEA CB.GP (src, #opnd(getRegLoc(S, an, reg, spillLoc)))))
(* Spill the temporary associated with a copy *)
fun spillTmp S {annotations=an, reg, copy=I.COPY{k=CB.GP, sz, tmp, dst, src}, spillLoc} = let
val loc = #opnd(getRegLoc(S, an, reg, spillLoc))
in
inc intSpillsCnt;
I.COPY{k=CB.GP, sz=sz, tmp=SOME loc, dst=dst, src=src}
end
| spillTmp _ _ = error "spillTmp"
(* Rename integer register *)
fun renameR{fromSrc,toSrc,instr} =
let val _ = inc intRenamesCnt
val instr' = Rewrite.rewriteUse(instr, fromSrc, toSrc)
in {code=[instr'], proh=[], newReg=SOME toSrc}
end
(* Reload integer register *)
fun reloadR S {annotations=an, reg, spillLoc, instr} = let
fun reload(instrAn, I.ANNOTATION{a, i}) = reload(a::instrAn, i)
| reload(instrAn, I.LIVE{regs, spilled}) =
{code=[I.LIVE{regs=C.rmvReg(reg, regs), spilled=C.addReg(reg, spilled)}],
proh=[],
newReg=NONE}
| reload(_, I.KILL _) = error "reloadR: KILL"
| reload (_, I.COPY _) = error "reloadR: COPY"
| reload(instrAn, instr as I.INSTR _) = let
val spillLoc = #opnd (getRegLoc(S, an, reg, spillLoc))
in
inc intReloadsCnt;
SpillInstr.reload CB.GP (instr, reg, spillLoc)
end
in reload([], instr)
end
(* reload the register dst from the spill location for reg, i.e. spillLoc *)
fun reloadReg S {annotations=an,reg,dst,spillLoc} =
(inc intReloadsCnt;
#code(SpillInstr.reloadFromEA CB.GP (dst, #opnd(getRegLoc(S, an, reg, spillLoc)))))
(*-------------------------------------------------------------*)
local
val {low,high} = C.cellRange CellsBasis.FP
val arr = Array.array(high+1,false)
val others = mark(arr, high+1, Float.dedicated, [])
in
structure FR = GetReg(val first=low val nRegs=high-low+1
val available=map CellsBasis.registerId Float.avail)
val dedicatedF : int -> bool = isDedicated(high+1, arr, others)
end
fun getFregLoc(S, an, Ra.FRAME loc) = Float.spillLoc(S, an, loc)
| getFregLoc _ = error "getFregLoc"
fun fcopy((rds as [d], rss as [s]), I.COPY{sz, ...}) =
if CB.sameColor(d,s) then []
else [I.COPY{k=CB.FP, sz=sz, dst=rds, src=rss, tmp=NONE}]
| fcopy((rds, rss), I.COPY{tmp, sz, ...}) =
[I.COPY{k=CB.FP, sz=sz, dst=rds, src=rss, tmp=tmp}]
| fcopy _ = error "fcopy: COPY?"
(* Spill floating point register *)
fun spillF S {annotations, kill=true, reg, spillLoc, instr} =
if pure instr then {code=[], proh=[], newReg=NONE}
else spillF S {annotations=annotations,kill=false,
spillLoc=spillLoc, reg=reg,instr=instr}
| spillF S {annotations=an, kill, reg, spillLoc, instr} = let
(* preserve annotation on instruction *)
fun spill(instrAn, I.ANNOTATION{a, i}) = spill(a::instrAn, i)
| spill(instrAn, I.KILL{regs, spilled}) =
{code=
[annotate
(instrAn,
I.KILL {regs=C.rmvFreg(reg, regs),
spilled=C.addFreg(reg, spilled)})],
proh = [],
newReg=NONE}
| spill(instrAn, I.LIVE _) = error "spillF: LIVE"
| spill(_, I.COPY _) = error "spillF: COPY"
| spill(instrAn, I.INSTR _) =
(inc floatSpillsCnt;
SpillInstr.spill CB.FP (instr, reg, getFregLoc(S, an, spillLoc)))
in spill([], instr)
end
(* spill src at the spill location for reg, i.e. spillLoc *)
fun spillFreg S {annotations=an,reg,src,spillLoc} =
(inc floatSpillsCnt;
#code(SpillInstr.spillToEA CB.FP (src, getFregLoc(S, an, spillLoc))))
(* Spill the temporary associated with a copy *)
fun spillFtmp S {annotations=an, reg, copy=I.COPY{k=CB.FP, sz, tmp, dst, src}, spillLoc} = let
val loc = getFregLoc(S, an, spillLoc)
in
inc floatSpillsCnt;
I.COPY{k=CB.FP, sz=sz, tmp=SOME loc, dst=dst, src=src}
end
| spillFtmp _ _ = error "spillFtmp"
(* Rename floating point register *)
fun renameF{fromSrc,toSrc,instr} =
let val _ = inc floatRenamesCnt
val instr' = Rewrite.frewriteUse(instr, fromSrc, toSrc)
in {code=[instr'], proh=[], newReg=SOME toSrc}
end
(* Reload floating point register *)
fun reloadF S {annotations=an, reg, spillLoc, instr} = let
fun reload(instrAn, I.ANNOTATION{a,i}) = reload(a::instrAn, i)
| reload(instrAn, I.LIVE{regs, spilled}) =
{code=[I.LIVE{regs=C.rmvFreg(reg, regs), spilled=C.addFreg(reg, spilled)}],
proh=[],
newReg=NONE}
| reload(_, I.KILL _) = error "reloadF: KILL"
| reload (_, I.COPY _) = error "reloadF: COPY"
| reload(instrAn, instr as I.INSTR _) =
(inc floatReloadsCnt;
SpillInstr.reload CB.FP (instr, reg, getFregLoc(S, an, spillLoc)))
in reload([], instr)
end
(* reload register dst from the spill location for reg, i.e. spillLoc *)
fun reloadFreg S {annotations=an,reg,dst,spillLoc} =
(inc floatReloadsCnt;
#code (SpillInstr.reloadFromEA CB.FP (dst, getFregLoc(S, an, spillLoc))))
val KR = length Int.avail
val KF = length Float.avail
fun params S =
[ { cellkind = CellsBasis.GP,
getreg = GR.getreg,
spill = spillR S,
spillSrc = spillReg S,
spillCopyTmp = spillTmp S,
reload = reloadR S,
reloadDst = reloadReg S,
renameSrc = renameR,
K = KR,
dedicated = dedicatedR,
copyInstr = copy,
spillProh = [],
memRegs = [],
mode = Int.mode
} : Ra.raClient,
{ cellkind = CellsBasis.FP,
getreg = FR.getreg,
spill = spillF S,
spillSrc = spillFreg S,
spillCopyTmp = spillFtmp S,
reload = reloadF S,
reloadDst = reloadFreg S,
renameSrc = renameF,
K = KF,
dedicated = dedicatedF,
copyInstr = fcopy,
spillProh = [],
memRegs = [],
mode = Float.mode
} : Ra.raClient
] : Ra.raClient list
fun run cluster = let
val S = beforeRA cluster
in
GR.reset();
FR.reset();
Ra.ra (params S) cluster
end
end
|
