! 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
-compiler.cfg.ssa.destruction
-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
-TUPLE: vreg-use n def-rep use-rep ;
+TUPLE: vreg-use n def-rep use-rep spill-slot? ;
: <vreg-use> ( n -- vreg-use ) vreg-use new swap >>n ;
-TUPLE: live-interval
+TUPLE: live-interval-state
vreg
reg spill-to spill-rep reload-from reload-rep
start end ranges uses
: last-use? ( insn# uses -- use/f )
[ drop f ] [ last [ n>> = ] keep and ] if-empty ;
-: (add-use) ( insn# live-interval -- use )
- uses>> 2dup last-use? dup [ 2nip ] [ drop new-use ] if ;
+:: (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?
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 ;
[ extend-range ] [ add-new-range ] if ;
: <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 )
M: insn compute-live-intervals* drop ;
-:: record-def ( vreg n -- )
+:: record-def ( vreg n spill-slot? -- )
vreg live-interval :> live-interval
n live-interval shorten-range
- n live-interval (add-use) vreg rep-of >>def-rep drop ;
+ n live-interval spill-slot? (add-use) vreg rep-of >>def-rep drop ;
-:: record-use ( vreg n -- )
+:: record-use ( vreg n spill-slot? -- )
vreg live-interval :> live-interval
from get n live-interval add-range
- n live-interval (add-use) vreg rep-of >>use-rep drop ;
+ n live-interval spill-slot? (add-use) vreg rep-of >>use-rep drop ;
:: record-temp ( vreg n -- )
vreg live-interval :> live-interval
n n live-interval add-range
- n live-interval (add-use) vreg rep-of >>def-rep drop ;
+ n live-interval f (add-use) vreg rep-of >>def-rep drop ;
M: vreg-insn compute-live-intervals* ( insn -- )
dup insn#>>
- [ [ defs-vreg ] dip '[ _ record-def ] when* ]
- [ [ uses-vregs ] dip '[ _ record-use ] each ]
+ [ [ 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 -- )
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 ;
projects / factor.git / blobdiff