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
10 compiler.cfg.utilities
11 compiler.cfg.instructions
12 compiler.cfg.predecessors
13 compiler.cfg.parallel-copy
14 compiler.cfg.linear-scan.assignment
15 compiler.cfg.linear-scan.allocation.state ;
16 IN: compiler.cfg.linear-scan.resolve
20 : spill-temp ( rep -- n )
21 spill-temps get [ next-spill-slot ] cache ;
23 : add-mapping ( from to rep -- )
24 '[ _ 2array ] bi@ 2array , ;
26 :: resolve-value-data-flow ( bb to vreg -- )
29 2dup = [ 2drop ] [ vreg rep-of add-mapping ] if ;
31 : compute-mappings ( bb to -- mappings )
32 dup live-in dup assoc-empty? [ 3drop f ] [
33 [ keys [ resolve-value-data-flow ] with with each ] { } make
36 : memory->register ( from to -- )
37 swap [ first2 ] [ first n>> ] bi* _reload ;
39 : register->memory ( from to -- )
40 [ first2 ] [ first n>> ] bi* _spill ;
42 : temp->register ( from to -- )
43 nip [ first ] [ second ] [ second spill-temp ] tri _reload ;
45 : register->temp ( from to -- )
46 drop [ first2 ] [ second spill-temp ] bi _spill ;
48 : register->register ( from to -- )
49 swap [ first ] [ first2 ] bi* ##copy ;
53 : >insn ( from to -- )
55 { [ over temp eq? ] [ temp->register ] }
56 { [ dup temp eq? ] [ register->temp ] }
57 { [ over first spill-slot? ] [ memory->register ] }
58 { [ dup first spill-slot? ] [ register->memory ] }
59 [ register->register ]
62 : mapping-instructions ( alist -- insns )
63 [ swap ] H{ } assoc-map-as
64 [ temp [ swap >insn ] parallel-mapping ] { } make ;
66 : perform-mappings ( bb to mappings -- )
67 dup empty? [ 3drop ] [
68 mapping-instructions insert-simple-basic-block
69 cfg get cfg-changed drop
72 : resolve-edge-data-flow ( bb to -- )
73 2dup compute-mappings perform-mappings ;
75 : resolve-block-data-flow ( bb -- )
76 dup successors>> [ resolve-edge-data-flow ] with each ;
78 : resolve-data-flow ( cfg -- )
81 H{ } clone spill-temps set
82 [ resolve-block-data-flow ] each-basic-block ;