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7153771: array bound check elimination for c1

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When possible optimize out array bound checks, inserting predicates when needed.

Reviewed-by: never, kvn, twisti
This commit is contained in:
Thomas Wuerthinger 2013-03-21 09:27:54 +01:00 • committed by Roland Westrelin
parent 2f4ecb86a2
commit 06ef4cddf7
40 changed files with 2861 additions and 153 deletions
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10
hotspot/src/share/vm/c1/c1_ValueMap.hpp
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@ -206,6 +206,8 @@ class ValueNumberingVisitor: public InstructionVisitor {
void do_ProfileInvoke (ProfileInvoke* x) { /* nothing to do */ };
void do_RuntimeCall (RuntimeCall* x) { /* nothing to do */ };
void do_MemBar (MemBar* x) { /* nothing to do */ };
void do_RangeCheckPredicate(RangeCheckPredicate* x) { /* nothing to do */ };
void do_Assert (Assert* x) { /* nothing to do */ };
};
@ -225,15 +227,22 @@ class ValueNumberingEffects: public ValueNumberingVisitor {
class GlobalValueNumbering: public ValueNumberingVisitor {
private:
Compilation* _compilation; // compilation data
ValueMap* _current_map; // value map of current block
ValueMapArray _value_maps; // list of value maps for all blocks
ValueSet _processed_values; // marker for instructions that were already processed
bool _has_substitutions; // set to true when substitutions must be resolved
public:
// accessors
Compilation* compilation() const { return _compilation; }
ValueMap* current_map() { return _current_map; }
ValueMap* value_map_of(BlockBegin* block) { return _value_maps.at(block->linear_scan_number()); }
void set_value_map_of(BlockBegin* block, ValueMap* map) { assert(value_map_of(block) == NULL, ""); _value_maps.at_put(block->linear_scan_number(), map); }
bool is_processed(Value v) { return _processed_values.contains(v); }
void set_processed(Value v) { _processed_values.put(v); }
// implementation for abstract methods of ValueNumberingVisitor
void kill_memory() { current_map()->kill_memory(); }
void kill_field(ciField* field, bool all_offsets) { current_map()->kill_field(field, all_offsets); }
@ -241,6 +250,7 @@ class GlobalValueNumbering: public ValueNumberingVisitor {
// main entry point that performs global value numbering
GlobalValueNumbering(IR* ir);
void substitute(Instruction* instr); // substitute instruction if it is contained in current value map
};
#endif // SHARE_VM_C1_C1_VALUEMAP_HPP