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jb/tuple get #129

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c1273da
add tuple get optimization
jackbackrack Sep 28, 2021
29d5d18
turn off debug printing
jackbackrack Sep 28, 2021
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28 changes: 22 additions & 6 deletions compiler/stz-el.stanza
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Original file line number Diff line number Diff line change
Expand Up @@ -2540,13 +2540,13 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
;Compute binding table.
;Every entry in the binding table, x => e, indicates that
;x is defined exactly once by the EObject or ENewObject instruction.
defn binding-table (e:EBody) -> IntTable<EObject|ENewObject> :
val table = IntListTable<EObject|ENewObject>()
defn binding-table (e:EBody) -> IntTable<ELItem> :
val table = IntListTable<ELItem>()
val remove-set = IntSet()
for i in ins(e) do :
match(i:EObject|ENewObject) : add(table, n(x(i)), i)
match(i:EObject|ENewObject|ETuple) : add(table, n(x(i)), i)
else : do(add{remove-set, n(_)}, varlocs(i))
to-inttable<EObject|ENewObject> $
to-inttable<ELItem> $
for entry in table seq? :
if remove-set[key(entry)] : None()
else if length(value(entry)) == 1 : One(key(entry) => head(value(entry)))
Expand All @@ -2563,7 +2563,7 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
;field. Calls fail() if not a match.
defn unbox-object-get (e:EObjectGet,
vt:VarTable,
bindings:IntTable<EObject|ENewObject>) -> [EVarLoc, EImm] :
bindings:IntTable<ELItem>) -> [EVarLoc, EImm] :
val v = y(e) as? EVar
val o = get?(bindings, n(v)) as? ENewObject
val value = ys(o)[index(e)]
Expand All @@ -2575,7 +2575,7 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
;Calls fail() if not a match.
defn unbox-load (e:ELoad,
vt:VarTable,
bindings:IntTable<EObject|ENewObject>, ) -> [EVarLoc, EImm] :
bindings:IntTable<ELItem>, ) -> [EVarLoc, EImm] :
val field = loc(e) as? EField
val v = y(loc(field) as? EDeref) as? EVar
val o = get?(bindings, n(v)) as? EObject
Expand All @@ -2584,6 +2584,17 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
fail() when not immutable?(vt,value)
[x(e), value]

;If the given ETupleGet expression corresponds to a retrieval
;of a tuple element of a known tuple then return the destination and the field.
;Calls fail() if not a match.
defn unbox-tuple-get (e:ETupleGet,
vt:VarTable,
bindings:IntTable<ELItem>, ) -> [EVarLoc, EImm] :
val v = y(e) as? EVar
val t = get?(bindings, n(v)) as? ETuple
val value = ys(t)[index(e)]
[x(e), value]

;Perform unboxing folds in the given body.
;Assumes that all nested bodies have already been folded.
defn fold-in-body (e:EBody, vt:VarTable) -> EBody :
Expand All @@ -2603,6 +2614,11 @@ defn box-unbox-fold (epackage:EPackage, gvt:VarTable) -> EPackage :
val [x, v] = unbox-load(i, vt, bindings)
EDef(x, v, false)
else : i
(i:ETupleGet) :
attempt :
val [x, v] = unbox-tuple-get(i, vt, bindings)
EDef(x, v, false)
else : i
(i) : i

;Attempt to fold all instructions.
Expand Down