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annotate src/share/vm/opto/coalesce.hpp @ 12035:33d39b75663f
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author | ehelin |
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date | Thu, 15 Aug 2013 06:20:48 -0700 |
parents | 8373c19be854 |
children | 8c83625e3a53 |
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0 | 1 /* |
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4 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #ifndef SHARE_VM_OPTO_COALESCE_HPP |
26 #define SHARE_VM_OPTO_COALESCE_HPP | |
27 | |
28 #include "opto/phase.hpp" | |
29 | |
0 | 30 class LoopTree; |
31 class LRG; | |
32 class LRG_List; | |
33 class Matcher; | |
34 class PhaseIFG; | |
35 class PhaseCFG; | |
36 | |
37 //------------------------------PhaseCoalesce---------------------------------- | |
38 class PhaseCoalesce : public Phase { | |
39 protected: | |
40 PhaseChaitin &_phc; | |
41 | |
42 public: | |
43 // Coalesce copies | |
10111 | 44 PhaseCoalesce(PhaseChaitin &phc) |
45 : Phase(Coalesce) | |
46 , _phc(phc) {} | |
0 | 47 |
48 virtual void verify() = 0; | |
49 | |
50 // Coalesce copies | |
10111 | 51 void coalesce_driver(); |
0 | 52 |
53 // Coalesce copies in this block | |
10111 | 54 virtual void coalesce(Block *b) = 0; |
0 | 55 |
56 // Attempt to coalesce live ranges defined by these 2 | |
10111 | 57 void combine_these_two(Node *n1, Node *n2); |
0 | 58 |
10111 | 59 LRG &lrgs(uint lidx) { return _phc.lrgs(lidx); } |
0 | 60 #ifndef PRODUCT |
61 // Dump internally name | |
10111 | 62 void dump(Node *n) const; |
0 | 63 // Dump whole shebang |
64 void dump() const; | |
65 #endif | |
66 }; | |
67 | |
68 //------------------------------PhaseAggressiveCoalesce------------------------ | |
69 // Aggressively, pessimistic coalesce copies. Aggressive means ignore graph | |
70 // colorability; perhaps coalescing to the point of forcing a spill. | |
71 // Pessimistic means we cannot coalesce if 2 live ranges interfere. This | |
72 // implies we do not hit a fixed point right away. | |
73 class PhaseAggressiveCoalesce : public PhaseCoalesce { | |
74 uint _unique; | |
75 public: | |
76 // Coalesce copies | |
77 PhaseAggressiveCoalesce( PhaseChaitin &chaitin ) : PhaseCoalesce(chaitin) {} | |
78 | |
79 virtual void verify() { }; | |
80 | |
81 // Aggressively coalesce copies in this block | |
82 virtual void coalesce( Block *b ); | |
83 | |
84 // Where I fail to coalesce, manifest virtual copies as the Real Thing | |
85 void insert_copies( Matcher &matcher ); | |
86 | |
87 // Copy insertion needs some smarts in case live ranges overlap | |
88 void insert_copy_with_overlap( Block *b, Node *copy, uint dst_name, uint src_name ); | |
89 }; | |
90 | |
91 | |
92 //------------------------------PhaseConservativeCoalesce---------------------- | |
93 // Conservatively, pessimistic coalesce copies. Conservative means do not | |
94 // coalesce if the resultant live range will be uncolorable. Pessimistic | |
95 // means we cannot coalesce if 2 live ranges interfere. This implies we do | |
96 // not hit a fixed point right away. | |
97 class PhaseConservativeCoalesce : public PhaseCoalesce { | |
98 IndexSet _ulr; // Union live range interferences | |
99 public: | |
100 // Coalesce copies | |
101 PhaseConservativeCoalesce( PhaseChaitin &chaitin ); | |
102 | |
103 virtual void verify(); | |
104 | |
105 // Conservatively coalesce copies in this block | |
106 virtual void coalesce( Block *b ); | |
107 | |
108 // Coalesce this chain of copies away | |
109 bool copy_copy( Node *dst_copy, Node *src_copy, Block *b, uint bindex ); | |
110 | |
111 void union_helper( Node *lr1_node, Node *lr2_node, uint lr1, uint lr2, Node *src_def, Node *dst_copy, Node *src_copy, Block *b, uint bindex ); | |
112 | |
113 uint compute_separating_interferences(Node *dst_copy, Node *src_copy, Block *b, uint bindex, RegMask &rm, uint rm_size, uint reg_degree, uint lr1, uint lr2); | |
114 | |
115 void update_ifg(uint lr1, uint lr2, IndexSet *n_lr1, IndexSet *n_lr2); | |
116 }; | |
1972 | 117 |
118 #endif // SHARE_VM_OPTO_COALESCE_HPP |