! Copyright (C) 2008, 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
-USING: namespaces kernel assocs accessors sequences math math.order fry
-combinators binary-search compiler.cfg.instructions compiler.cfg.registers
-compiler.cfg.def-use compiler.cfg.liveness compiler.cfg.linearization.order
-compiler.cfg ;
+USING: accessors assocs binary-search combinators
+compiler.cfg.def-use compiler.cfg.instructions
+compiler.cfg.linearization compiler.cfg.liveness
+compiler.cfg.registers compiler.cfg.ssa.destruction.leaders cpu.architecture
+fry kernel locals math math.intervals math.order namespaces sequences ;
IN: compiler.cfg.linear-scan.live-intervals
TUPLE: live-range from to ;
C: <live-range> live-range
-SYMBOLS: +def+ +use+ +memory+ ;
+TUPLE: vreg-use n def-rep use-rep spill-slot? ;
-TUPLE: vreg-use n type ;
+: <vreg-use> ( n -- vreg-use ) vreg-use new swap >>n ;
-C: <vreg-use> vreg-use
-
-TUPLE: live-interval
+TUPLE: live-interval-state
vreg
-reg spill-to reload-from
-start end ranges uses ;
+reg spill-to spill-rep reload-from reload-rep
+start end ranges uses
+reg-class ;
+
+: first-use ( live-interval -- use ) uses>> first ; inline
+
+: last-use ( live-interval -- use ) uses>> last ; inline
+
+: new-use ( insn# uses -- use )
+ [ <vreg-use> dup ] dip push ;
+
+: last-use? ( insn# uses -- use/f )
+ [ drop f ] [ last [ n>> = ] keep and ] if-empty ;
+
+:: (add-use) ( insn# live-interval spill-slot? -- use )
+ live-interval uses>> :> uses
+ insn# uses last-use? [ insn# uses new-use ] unless*
+ spill-slot? [ t >>spill-slot? ] when ;
GENERIC: covers? ( insn# obj -- ? )
M: live-range covers? [ from>> ] [ to>> ] bi between? ;
-M: live-interval covers? ( insn# live-interval -- ? )
+M: live-interval-state covers? ( insn# live-interval -- ? )
ranges>>
dup length 4 <= [
[ covers? ] with any?
[ drop ] [ [ from>> <=> ] with search nip ] 2bi
covers?
] if ;
-
+
+: (find-use) ( insn# live-interval -- vreg-use )
+ uses>> [ n>> <=> ] with search nip ;
+
+:: find-use ( insn# live-interval -- vreg-use )
+ insn# live-interval (find-use)
+ dup [ dup n>> insn# = [ drop f ] unless ] when ;
+
: add-new-range ( from to live-interval -- )
[ <live-range> ] dip ranges>> push ;
: shorten-range ( n live-interval -- )
dup ranges>> empty?
- [ dupd add-new-range ] [ ranges>> last (>>from) ] if ;
+ [ dupd add-new-range ] [ ranges>> last from<< ] if ;
: extend-range ( from to live-range -- )
ranges>> last
2dup extend-range?
[ extend-range ] [ add-new-range ] if ;
-: add-use ( insn live-interval type -- )
- dup +memory+ eq? [ 3drop ] [
- swap [ [ insn#>> ] dip <vreg-use> ] dip
- uses>> push
- ] if ;
-
-: <live-interval> ( vreg -- live-interval )
- \ live-interval new
+: <live-interval> ( vreg reg-class -- live-interval )
+ \ live-interval-state new
V{ } clone >>uses
V{ } clone >>ranges
+ swap >>reg-class
swap >>vreg ;
: block-from ( bb -- n ) instructions>> first insn#>> 1 - ;
: block-to ( bb -- n ) instructions>> last insn#>> ;
-! Mapping from vreg to live-interval
+SYMBOLS: from to ;
+
SYMBOL: live-intervals
: live-interval ( vreg -- live-interval )
- live-intervals get [ <live-interval> ] cache ;
+ leader live-intervals get
+ [ dup rep-of reg-class-of <live-interval> ] cache ;
GENERIC: compute-live-intervals* ( insn -- )
M: insn compute-live-intervals* drop ;
-: handle-output ( insn vreg type -- )
- [ live-interval ] dip
- [ drop [ insn#>> ] dip shorten-range ] [ add-use ] 3bi ;
+:: record-def ( vreg n spill-slot? -- )
+ vreg live-interval :> live-interval
+
+ n live-interval shorten-range
+ n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
+
+:: record-use ( vreg n spill-slot? -- )
+ vreg live-interval :> live-interval
-: handle-input ( insn vreg type -- )
- [ live-interval ] dip
- [ drop [ [ basic-block get block-from ] dip insn#>> ] dip add-range ]
- [ add-use ]
- 3bi ;
+ from get n live-interval add-range
+ n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
-: handle-temp ( insn vreg -- )
- live-interval
- [ [ insn#>> dup ] dip add-range ] [ +def+ add-use ] 2bi ;
+:: record-temp ( vreg n -- )
+ vreg live-interval :> live-interval
-M: vreg-insn compute-live-intervals*
- [ dup defs-vreg [ +def+ handle-output ] with when* ]
- [ dup uses-vregs [ +use+ handle-input ] with each ]
- [ dup temp-vregs [ handle-temp ] with each ]
- tri ;
+ n n live-interval add-range
+ n live-interval f (add-use) vreg rep-of >>def-rep drop ;
-M: clobber-insn compute-live-intervals*
- [ dup defs-vreg [ +use+ handle-output ] with when* ]
- [ dup uses-vregs [ +memory+ handle-input ] with each ]
- [ dup temp-vregs [ handle-temp ] with each ]
- tri ;
+M: vreg-insn compute-live-intervals* ( insn -- )
+ dup insn#>>
+ [ [ defs-vregs ] dip '[ _ f record-def ] each ]
+ [ [ uses-vregs ] dip '[ _ f record-use ] each ]
+ [ [ temp-vregs ] dip '[ _ record-temp ] each ]
+ 2tri ;
+
+! Extend lifetime intervals of base pointers, so that their
+! values are available even if the base pointer is never used
+! again.
+
+GENERIC: uses-vregs* ( insn -- seq )
+
+M: gc-map-insn uses-vregs*
+ [ uses-vregs ] [ gc-map>> derived-roots>> values ] bi append ;
+
+M: vreg-insn uses-vregs* uses-vregs ;
+
+M: insn uses-vregs* drop f ;
+
+M: clobber-insn compute-live-intervals* ( insn -- )
+ dup insn#>>
+ [ [ defs-vregs ] dip '[ _ f record-def ] each ]
+ [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
+ [ [ temp-vregs ] dip '[ _ record-temp ] each ]
+ 2tri ;
+
+M: hairy-clobber-insn compute-live-intervals* ( insn -- )
+ dup insn#>>
+ [ [ defs-vregs ] dip '[ _ t record-def ] each ]
+ [ [ uses-vregs* ] dip '[ _ t record-use ] each ]
+ [ [ temp-vregs ] dip '[ _ record-temp ] each ]
+ 2tri ;
: handle-live-out ( bb -- )
- [ block-from ] [ block-to ] [ live-out keys ] tri
- [ live-interval add-range ] with with each ;
+ live-out dup assoc-empty? [ drop ] [
+ [ from get to get ] dip keys
+ [ live-interval add-range ] 2with each
+ ] if ;
-! A location where all registers have to be spilled
-TUPLE: sync-point n ;
+TUPLE: sync-point n keep-dst? ;
C: <sync-point> sync-point
-! Sequence of sync points
SYMBOL: sync-points
GENERIC: compute-sync-points* ( insn -- )
+M: hairy-clobber-insn compute-sync-points*
+ insn#>> f <sync-point> sync-points get push ;
+
M: clobber-insn compute-sync-points*
- insn#>> <sync-point> sync-points get push ;
+ insn#>> t <sync-point> sync-points get push ;
M: insn compute-sync-points* drop ;
: compute-live-intervals-step ( bb -- )
- [ basic-block set ]
- [ handle-live-out ]
- [
- instructions>> <reversed> [
- [ compute-live-intervals* ]
- [ compute-sync-points* ]
- bi
- ] each
- ] tri ;
+ {
+ [ block-from from set ]
+ [ block-to to set ]
+ [ handle-live-out ]
+ [
+ instructions>> <reversed> [
+ [ compute-live-intervals* ]
+ [ compute-sync-points* ]
+ bi
+ ] each
+ ]
+ } cleave ;
: init-live-intervals ( -- )
H{ } clone live-intervals set
V{ } clone sync-points set ;
-
+
: compute-start/end ( live-interval -- )
dup ranges>> [ first from>> ] [ last to>> ] bi
[ >>start ] [ >>end ] bi* drop ;
dup start>> -1 = [ bad-live-interval ] [ drop ] if ;
: finish-live-intervals ( live-intervals -- seq )
- ! Since live intervals are computed in a backward order, we have
- ! to reverse some sequences, and compute the start and end.
values dup [
{
- [ ranges>> reverse! drop ]
- [ uses>> reverse! drop ]
+ [ [ { } like reverse! ] change-ranges drop ]
+ [ [ { } like reverse! ] change-uses drop ]
[ compute-start/end ]
[ check-start ]
} cleave
: compute-live-intervals ( cfg -- live-intervals sync-points )
init-live-intervals
- linearization-order <reversed> [ compute-live-intervals-step ] each
+ linearization-order <reversed> [ kill-block?>> ] reject
+ [ compute-live-intervals-step ] each
live-intervals get finish-live-intervals
sync-points get ;
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