1 ! Copyright (C) 2009, 2011 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators compiler.cfg.def-use
4 compiler.cfg.dominance compiler.cfg.instructions
5 compiler.cfg.liveness compiler.cfg.parallel-copy
6 compiler.cfg.registers compiler.cfg.rpo compiler.cfg.ssa.cssa
7 compiler.cfg.ssa.destruction.leaders
8 compiler.cfg.ssa.interference
9 compiler.cfg.ssa.interference.live-ranges compiler.cfg.utilities
10 cpu.architecture kernel make namespaces sequences sets ;
11 FROM: namespaces => set ;
12 IN: compiler.cfg.ssa.destruction
14 SYMBOL: class-element-map
20 : value-of ( vreg -- value )
21 dup insn-of dup ##tagged>integer? [ nip src>> ] [ drop ] if ;
23 : init-coalescing ( -- )
25 [ keys unique leader-map set ]
27 [ [ dup dup value-of ] dip <vreg-info> 1array ] assoc-map
30 V{ } clone copies set ;
32 : coalesce-elements ( merged follower leader -- )
33 class-element-map get [ delete-at ] [ set-at ] bi-curry bi* ;
35 : coalesce-vregs ( merged follower leader -- )
36 2dup swap leader-map get set-at coalesce-elements ;
38 GENERIC: prepare-insn ( insn -- )
40 M: insn prepare-insn drop ;
42 M: alien-call-insn prepare-insn drop ;
44 M: vreg-insn prepare-insn
45 [ temp-vregs [ leader-map get conjoin ] each ]
47 [ defs-vregs ] [ uses-vregs ] bi
48 2dup [ empty? not ] both? [
50 2dup [ rep-of reg-class-of ] bi@ eq?
51 [ 2array copies get push ] [ 2drop ] if
55 M: ##copy prepare-insn
56 [ dst>> ] [ src>> ] bi 2array copies get push ;
58 M: ##parallel-copy prepare-insn
59 values>> copies get push-all ;
61 : leaders ( vreg1 vreg2 -- vreg1' vreg2' )
64 : vregs-interfere? ( vreg1 vreg2 -- merged/f ? )
65 [ class-element-map get at ] bi@ sets-interfere? ;
67 ERROR: vregs-shouldn't-interfere vreg1 vreg2 ;
69 : try-eliminate-copy ( follower leader must? -- )
70 -rot leaders 2dup = [ 3drop ] [
71 2dup vregs-interfere? [
72 drop rot [ vregs-shouldn't-interfere ] [ 2drop ] if
73 ] [ -rot coalesce-vregs drop ] if
76 M: ##tagged>integer prepare-insn
77 [ dst>> ] [ src>> ] bi t try-eliminate-copy ;
80 [ dst>> ] [ inputs>> values ] bi [ t try-eliminate-copy ] with each ;
82 : prepare-coalescing ( cfg -- )
83 init-coalescing [ [ prepare-insn ] each ] simple-analysis ;
85 : process-copies ( copies -- )
86 [ f try-eliminate-copy ] assoc-each ;
88 : perform-coalescing ( cfg -- )
89 prepare-coalescing copies get process-copies ;
91 GENERIC: cleanup-insn ( insn -- )
93 : useful-copy? ( insn -- ? )
94 [ dst>> ] [ src>> ] bi leaders = not ; inline
96 M: ##copy cleanup-insn
97 dup useful-copy? [ , ] [ drop ] if ;
99 M: ##parallel-copy cleanup-insn
100 values>> [ leaders ] assoc-map [ first2 = ] reject
101 parallel-copy-rep % ;
103 M: ##tagged>integer cleanup-insn
104 dup useful-copy? [ , ] [ drop ] if ;
106 M: ##phi cleanup-insn drop ;
108 M: insn cleanup-insn , ;
110 : cleanup-cfg ( cfg -- )
111 [ [ [ cleanup-insn ] each ] V{ } make ] simple-optimization ;
115 : destruct-ssa ( cfg -- )