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7197327: 40% regression on 8 b41 comp 8 b40 on specjvm2008.mpegaudio on oob

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Add support for expensive nodes.

Reviewed-by: kvn
This commit is contained in:
Roland Westrelin 2013-02-12 12:56:11 +01:00
parent 527b0d661a
commit c401bf065d
10 changed files with 456 additions and 25 deletions
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7
hotspot/src/share/vm/opto/node.hpp
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@ -378,6 +378,8 @@ protected:
bool is_dead() const;
#define is_not_dead(n) ((n) == NULL || !VerifyIterativeGVN || !((n)->is_dead()))
#endif
// Check whether node has become unreachable
bool is_unreachable(PhaseIterGVN &igvn) const;
// Set a required input edge, also updates corresponding output edge
void add_req( Node *n ); // Append a NEW required input
@ -646,7 +648,8 @@ public:
Flag_may_be_short_branch = Flag_is_dead_loop_safe << 1,
Flag_avoid_back_to_back = Flag_may_be_short_branch << 1,
Flag_has_call = Flag_avoid_back_to_back << 1,
_max_flags = (Flag_has_call << 1) - 1 // allow flags combination
Flag_is_expensive = Flag_has_call << 1,
_max_flags = (Flag_is_expensive << 1) - 1 // allow flags combination
};
private:
@ -819,6 +822,8 @@ public:
// The node is a "macro" node which needs to be expanded before matching
bool is_macro() const { return (_flags & Flag_is_macro) != 0; }
// The node is expensive: the best control is set during loop opts
bool is_expensive() const { return (_flags & Flag_is_expensive) != 0 && in(0) != NULL; }
//----------------- Optimization