1 ! Copyright (C) 2009 Slava Pestov.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays assocs combinators
4 combinators.short-circuit fry kernel locals namespaces
5 make math sequences hashtables
9 compiler.cfg.instructions
10 compiler.cfg.parallel-copy
11 compiler.cfg.linear-scan.assignment
12 compiler.cfg.linear-scan.allocation.state ;
13 IN: compiler.cfg.linear-scan.resolve
17 : spill-temp ( reg-class -- n )
18 spill-temps get [ next-spill-slot ] cache ;
20 : add-mapping ( from to reg-class -- )
21 '[ _ 2array ] bi@ 2array , ;
23 :: resolve-value-data-flow ( bb to vreg -- )
26 2dup = [ 2drop ] [ vreg reg-class>> add-mapping ] if ;
28 : compute-mappings ( bb to -- mappings )
31 [ resolve-value-data-flow ] with with each
34 : memory->register ( from to -- )
35 swap [ first2 ] [ first n>> ] bi* _reload ;
37 : register->memory ( from to -- )
38 [ first2 ] [ first n>> ] bi* _spill ;
40 : temp->register ( from to -- )
41 nip [ first ] [ second ] [ second spill-temp ] tri _reload ;
43 : register->temp ( from to -- )
44 drop [ first2 ] [ second spill-temp ] bi _spill ;
46 : register->register ( from to -- )
47 swap [ first ] [ first2 ] bi* _copy ;
51 : >insn ( from to -- )
53 { [ over temp eq? ] [ temp->register ] }
54 { [ dup temp eq? ] [ register->temp ] }
55 { [ over first spill-slot? ] [ memory->register ] }
56 { [ dup first spill-slot? ] [ register->memory ] }
57 [ register->register ]
60 : mapping-instructions ( alist -- insns )
61 [ swap ] H{ } assoc-map-as
62 [ temp [ swap >insn ] parallel-mapping ] { } make ;
64 : perform-mappings ( bb to mappings -- )
65 dup empty? [ 3drop ] [
66 mapping-instructions <simple-block>
70 : resolve-edge-data-flow ( bb to -- )
71 2dup compute-mappings perform-mappings ;
73 : resolve-block-data-flow ( bb -- )
74 dup successors>> [ resolve-edge-data-flow ] with each ;
76 : resolve-data-flow ( cfg -- )
77 H{ } clone spill-temps set
78 [ resolve-block-data-flow ] each-basic-block ;