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functor SpillTable
(val architecture : string
val initialSpillOffset : int
val spillAreaSz : int
) :
sig
val architecture : string
val beginRA : unit -> unit
val get : RAGraph.spillLoc -> int
val getF : RAGraph.spillLoc -> int
end =
struct
structure G = RAGraph
fun error msg = MLRiscErrorMsg.error(architecture^".SpillTable",msg)
val itow = Word.fromInt
val architecture = architecture
exception RegSpills and FregSpills
val spillOffset = ref initialSpillOffset
val regspills : int G.SpillLocHashTable.hash_table =
G.SpillLocHashTable.mkTable(0,RegSpills)
val fregspills : int G.SpillLocHashTable.hash_table =
G.SpillLocHashTable.mkTable(0,FregSpills)
val lookupReg = G.SpillLocHashTable.lookup regspills
val enterReg = G.SpillLocHashTable.insert regspills
val lookupFreg = G.SpillLocHashTable.lookup fregspills
val enterFreg = G.SpillLocHashTable.insert fregspills
fun beginRA() =
((* Reset the regspills/fregspills map by need. *)
if !spillOffset = initialSpillOffset then ()
else (G.SpillLocHashTable.clear regspills;
G.SpillLocHashTable.clear fregspills
)
;
spillOffset := initialSpillOffset
)
fun newOffset offset =
if offset >= spillAreaSz then error "spill area too small"
else spillOffset := offset
(* Get spill location for integer registers *)
fun get loc =
lookupReg loc handle _ =>
let val offset = !spillOffset
in newOffset(offset+4);
enterReg (loc,offset);
offset
end
(* Get spill location for floating point registers *)
fun getF loc =
lookupFreg loc handle _ =>
let val offset = !spillOffset
val aligned = Word.toIntX (Word.andb(itow (offset+7), itow ~8))
in
newOffset(aligned+8);
enterFreg (loc, aligned);
aligned
end
end
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