! Copyright (C) 2008, 2010 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
-USING: namespaces kernel assocs accessors locals 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
-cpu.architecture ;
+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 rep 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
+reg spill-to spill-rep reload-from reload-rep
start end ranges uses
reg-class ;
: 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: f covers? 2drop f ;
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 ( rep n type live-interval -- )
- type +memory+ eq? [
- rep n type <vreg-use>
- live-interval uses>> push
- ] unless ;
-
: <live-interval> ( vreg reg-class -- live-interval )
- \ live-interval new
+ \ live-interval-state new
V{ } clone >>uses
V{ } clone >>ranges
swap >>reg-class
SYMBOLS: from to ;
-! Mapping from vreg to live-interval
SYMBOL: live-intervals
: live-interval ( vreg -- live-interval )
- live-intervals get [ dup rep-of reg-class-of <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 ( vreg n type -- )
- vreg rep-of :> rep
+:: record-def ( vreg n spill-slot? -- )
vreg live-interval :> live-interval
n live-interval shorten-range
- rep n type live-interval add-use ;
+ n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
-:: handle-input ( vreg n type -- )
- vreg rep-of :> rep
+:: record-use ( vreg n spill-slot? -- )
vreg live-interval :> live-interval
from get n live-interval add-range
- rep n type live-interval add-use ;
+ n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
-:: handle-temp ( vreg n -- )
- vreg rep-of :> rep
+:: record-temp ( vreg n -- )
vreg live-interval :> live-interval
n n live-interval add-range
- rep n +def+ live-interval add-use ;
+ n live-interval f (add-use) vreg rep-of >>def-rep drop ;
+
+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:: vreg-insn compute-live-intervals* ( insn -- )
- insn insn#>> :> n
+M: gc-map-insn uses-vregs*
+ [ uses-vregs ] [ gc-map>> derived-roots>> values ] bi append ;
- insn defs-vreg [ n +def+ handle-output ] when*
- insn uses-vregs [ n +use+ handle-input ] each
- insn temp-vregs [ n handle-temp ] each ;
+M: vreg-insn uses-vregs* uses-vregs ;
-M:: clobber-insn compute-live-intervals* ( insn -- )
- insn insn#>> :> n
+M: insn uses-vregs* drop f ;
- insn defs-vreg [ n +use+ handle-output ] when*
- insn uses-vregs [ n +memory+ handle-input ] each
- insn temp-vregs [ n handle-temp ] each ;
+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 -- )
live-out dup assoc-empty? [ drop ] [
[ from get to get ] dip keys
- [ live-interval add-range ] with with each
+ [ 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 ;
: 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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