! Copyright (C) 2009, 2011 Slava Pestov.
-! See http://factorcode.org/license.txt for BSD license.
-USING: accessors arrays assocs combinators compiler.cfg.def-use
-compiler.cfg.dominance compiler.cfg.instructions
-compiler.cfg.liveness compiler.cfg.parallel-copy
-compiler.cfg.registers compiler.cfg.rpo compiler.cfg.ssa.cssa
-compiler.cfg.ssa.destruction.leaders
-compiler.cfg.ssa.interference
+! See https://factorcode.org/license.txt for BSD license.
+USING: accessors assocs compiler.cfg.def-use compiler.cfg.dominance
+compiler.cfg.instructions compiler.cfg.liveness
+compiler.cfg.parallel-copy compiler.cfg.rpo compiler.cfg.ssa.cssa
+compiler.cfg.ssa.destruction.coalescing compiler.cfg.ssa.destruction.leaders
compiler.cfg.ssa.interference.live-ranges compiler.cfg.utilities
-cpu.architecture kernel locals make namespaces sequences sets ;
-FROM: namespaces => set ;
+kernel make sequences namespaces ;
IN: compiler.cfg.ssa.destruction
-SYMBOL: class-element-map
-
-: class-elements ( vreg -- elts ) class-element-map get at ;
-
<PRIVATE
-! Sequence of vreg pairs
-SYMBOL: copies
-
-: value-of ( vreg -- value )
- dup insn-of dup ##tagged>integer? [ nip src>> ] [ drop ] if ;
-
-: init-coalescing ( -- )
- defs get
- [ keys unique leader-map set ]
- [
- [ [ dup dup value-of ] dip <vreg-info> 1array ] assoc-map
- class-element-map set
- ] bi
- V{ } clone copies set ;
-
-: coalesce-elements ( merged vreg1 vreg2 -- )
- ! delete leader1's class, and set leader2's class to merged.
- class-element-map get [ delete-at ] [ set-at ] bi-curry bi* ;
-
-: coalesce-vregs ( merged leader1 leader2 -- )
- 2dup swap leader-map get set-at coalesce-elements ;
-
-GENERIC: prepare-insn ( insn -- )
-
-: maybe-eliminate-copy-later ( dst src -- )
- 2array copies get push ;
-
-M: insn prepare-insn drop ;
-
-M: alien-call-insn prepare-insn drop ;
-
-M: vreg-insn prepare-insn
- [ temp-vregs [ leader-map get conjoin ] each ]
- [
- [ defs-vregs ] [ uses-vregs ] bi
- 2dup [ empty? not ] both? [
- [ first ] bi@
- 2dup [ rep-of reg-class-of ] bi@ eq?
- [ maybe-eliminate-copy-later ] [ 2drop ] if
- ] [ 2drop ] if
- ] bi ;
-
-M: ##copy prepare-insn
- [ dst>> ] [ src>> ] bi maybe-eliminate-copy-later ;
-
-M: ##parallel-copy prepare-insn
- values>> [ first2 maybe-eliminate-copy-later ] each ;
-
-: leaders ( vreg1 vreg2 -- vreg1' vreg2' )
- [ leader ] bi@ ;
-
-: vregs-interfere? ( vreg1 vreg2 -- merged/f ? )
- [ class-elements ] bi@ sets-interfere? ;
-
-ERROR: vregs-shouldn't-interfere vreg1 vreg2 ;
-
-:: must-eliminate-copy ( vreg1 vreg2 -- )
- ! Eliminate a copy.
- vreg1 vreg2 = [
- vreg1 vreg2 vregs-interfere?
- [ vreg1 vreg2 vregs-shouldn't-interfere ]
- [ vreg1 vreg2 coalesce-vregs ]
- if
- ] unless ;
-
-M: ##tagged>integer prepare-insn
- [ dst>> ] [ src>> ] bi leaders must-eliminate-copy ;
-
-M: ##phi prepare-insn
- [ dst>> ] [ inputs>> values ] bi
- [ leaders must-eliminate-copy ] with each ;
-
-: prepare-coalescing ( cfg -- )
- init-coalescing
- [ [ prepare-insn ] each ] simple-analysis ;
-
-:: maybe-eliminate-copy ( vreg1 vreg2 -- )
- ! Eliminate a copy if possible.
- vreg1 vreg2 = [
- vreg1 vreg2 vregs-interfere?
- [ drop ] [ vreg1 vreg2 coalesce-vregs ] if
- ] unless ;
-
-: process-copies ( copies -- )
- [ leaders maybe-eliminate-copy ] assoc-each ;
-
-: perform-coalescing ( cfg -- )
- prepare-coalescing copies get process-copies ;
-
GENERIC: cleanup-insn ( insn -- )
: useful-copy? ( insn -- ? )
dup useful-copy? [ , ] [ drop ] if ;
M: ##parallel-copy cleanup-insn
- values>> [ leaders ] assoc-map [ first2 = not ] filter
+ values>> [ leaders ] assoc-map [ first2 = ] reject
parallel-copy-rep % ;
M: ##tagged>integer cleanup-insn
PRIVATE>
: destruct-ssa ( cfg -- )
- H{ } clone leader-map set
+ f leader-map set
{
needs-dominance
construct-cssa
compute-insns
compute-live-sets
compute-live-ranges
- perform-coalescing
+ coalesce-cfg
cleanup-cfg
compute-live-sets
} apply-passes ;