1 USING: accessors arrays assocs compiler.cfg.def-use
2 compiler.cfg.instructions compiler.cfg.linearization
3 compiler.cfg.registers compiler.cfg.ssa.destruction.leaders
4 compiler.cfg.ssa.interference compiler.utilities
5 cpu.architecture fry kernel make namespaces sequences sets
7 IN: compiler.cfg.ssa.destruction.coalescing
9 : zip-scalar ( scalar seq -- pairs )
12 SYMBOL: class-element-map
14 : value-of ( vreg -- value )
15 dup insn-of dup ##tagged>integer? [ nip src>> ] [ drop ] if ;
17 : coalesce-elements ( merged follower leader -- )
18 class-element-map get [ delete-at ] [ set-at ] bi-curry bi* ;
20 : coalesce-vregs ( merged follower leader -- )
21 2dup swap leader-map get set-at coalesce-elements ;
23 : vregs-interfere? ( vreg1 vreg2 -- merged/f ? )
24 class-element-map get '[ _ at ] bi@ sets-interfere? ;
26 ERROR: vregs-shouldn't-interfere vreg1 vreg2 ;
28 : try-eliminate-copy ( follower leader must? -- )
29 -rot leaders 2dup = [ 3drop ] [
30 2dup vregs-interfere? [
31 drop rot [ vregs-shouldn't-interfere ] [ 2drop ] if
32 ] [ -rot coalesce-vregs drop ] if
35 : try-eliminate-copies ( pairs must? -- )
36 '[ first2 _ try-eliminate-copy ] each ;
38 : initial-leaders ( insns -- leaders )
39 [ [ defs-vregs ] [ temp-vregs ] bi append ] map concat unique ;
41 : initial-class-elements ( -- class-elements )
42 defs get [ [ dup dup value-of ] dip <vreg-info> 1array ] assoc-map ;
44 : init-coalescing ( insns -- )
45 initial-leaders leader-map namespaces:set
46 initial-class-elements class-element-map namespaces:set ;
48 GENERIC: coalesce-now ( insn -- )
50 M: insn coalesce-now drop ;
52 M: ##tagged>integer coalesce-now
53 [ dst>> ] [ src>> ] bi t try-eliminate-copy ;
56 [ dst>> ] [ inputs>> values ] bi zip-scalar
57 sort t try-eliminate-copies ;
59 GENERIC: coalesce-later ( insn -- )
61 M: insn coalesce-later drop ;
63 M: alien-call-insn coalesce-later drop ;
65 M: vreg-insn coalesce-later
66 [ defs-vregs ] [ uses-vregs ] bi zip ?first [ , ] when* ;
68 M: ##copy coalesce-later
69 [ dst>> ] [ src>> ] bi 2array , ;
71 M: ##parallel-copy coalesce-later
74 : eliminatable-copy? ( vreg1 vreg2 -- ? )
75 [ rep-of ] bi@ [ [ reg-class-of ] same? ] [ [ rep-size ] same? ] 2bi and ;
77 : coalesce-cfg ( cfg -- )
78 cfg>insns-rpo dup init-coalescing
79 [ [ [ coalesce-now ] [ coalesce-later ] bi ] each ] { } make
80 [ first2 eliminatable-copy? ] filter f try-eliminate-copies ;