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 locals make namespaces sequences sets ;
11 FROM: namespaces => set ;
12 IN: compiler.cfg.ssa.destruction
14 SYMBOL: class-element-map
18 ! Sequence of vreg pairs
21 : value-of ( vreg -- value )
22 dup insn-of dup ##tagged>integer? [ nip src>> ] [ drop ] if ;
24 : init-coalescing ( -- )
26 [ keys unique leader-map set ]
28 [ [ dup dup value-of ] dip <vreg-info> 1array ] assoc-map
31 V{ } clone copies set ;
33 : coalesce-elements ( merged vreg1 vreg2 -- )
34 ! delete leader1's class, and set leader2's class to merged.
35 class-element-map get [ delete-at ] [ set-at ] bi-curry bi* ;
37 : coalesce-vregs ( merged leader1 leader2 -- )
38 2dup swap leader-map get set-at coalesce-elements ;
40 GENERIC: prepare-insn ( insn -- )
42 M: insn prepare-insn drop ;
44 M: alien-call-insn prepare-insn drop ;
46 M: vreg-insn prepare-insn
47 [ temp-vregs [ leader-map get conjoin ] each ]
49 [ defs-vregs ] [ uses-vregs ] bi
50 2dup [ empty? not ] both? [
52 2dup [ rep-of reg-class-of ] bi@ eq?
53 [ 2array copies get push ] [ 2drop ] if
57 M: ##copy prepare-insn
58 [ dst>> ] [ src>> ] bi 2array copies get push ;
60 M: ##parallel-copy prepare-insn
61 values>> copies get push-all ;
63 : leaders ( vreg1 vreg2 -- vreg1' vreg2' )
66 : vregs-interfere? ( vreg1 vreg2 -- merged/f ? )
67 [ class-element-map get at ] bi@ sets-interfere? ;
69 ERROR: vregs-shouldn't-interfere vreg1 vreg2 ;
71 :: must-eliminate-copy ( vreg1 vreg2 -- )
73 vreg1 vreg2 vregs-interfere?
74 [ vreg1 vreg2 vregs-shouldn't-interfere ]
75 [ vreg1 vreg2 coalesce-vregs ]
79 M: ##tagged>integer prepare-insn
80 [ dst>> ] [ src>> ] bi leaders must-eliminate-copy ;
83 [ dst>> ] [ inputs>> values ] bi
84 [ leaders must-eliminate-copy ] with each ;
86 : prepare-coalescing ( cfg -- )
87 init-coalescing [ [ prepare-insn ] each ] simple-analysis ;
89 :: maybe-eliminate-copy ( vreg1 vreg2 -- )
91 vreg1 vreg2 vregs-interfere?
92 [ drop ] [ vreg1 vreg2 coalesce-vregs ] if
95 : process-copies ( copies -- )
96 [ leaders maybe-eliminate-copy ] assoc-each ;
98 : perform-coalescing ( cfg -- )
99 prepare-coalescing copies get process-copies ;
101 GENERIC: cleanup-insn ( insn -- )
103 : useful-copy? ( insn -- ? )
104 [ dst>> ] [ src>> ] bi leaders = not ; inline
106 M: ##copy cleanup-insn
107 dup useful-copy? [ , ] [ drop ] if ;
109 M: ##parallel-copy cleanup-insn
110 values>> [ leaders ] assoc-map [ first2 = ] reject
111 parallel-copy-rep % ;
113 M: ##tagged>integer cleanup-insn
114 dup useful-copy? [ , ] [ drop ] if ;
116 M: ##phi cleanup-insn drop ;
118 M: insn cleanup-insn , ;
120 : cleanup-cfg ( cfg -- )
121 [ [ [ cleanup-insn ] each ] V{ } make ] simple-optimization ;
125 : destruct-ssa ( cfg -- )