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7079329: Adjust allocation prefetching for T4

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On T4 2 BIS instructions should be issued to prefetch 64 bytes

Reviewed-by: iveresov, phh, twisti
This commit is contained in:
Vladimir Kozlov 2011-08-16 16:59:46 -07:00
parent 080f790edc
commit 90651b2666
18 changed files with 299 additions and 129 deletions
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10
hotspot/src/share/vm/opto/memnode.hpp
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@ -1278,6 +1278,16 @@ public:
virtual int Opcode() const;
virtual uint ideal_reg() const { return NotAMachineReg; }
virtual uint match_edge(uint idx) const { return idx==2; }
virtual const Type *bottom_type() const { return Type::ABIO; }
};
// Allocation prefetch which may fault, TLAB size have to be adjusted.
class PrefetchAllocationNode : public Node {
public:
PrefetchAllocationNode(Node *mem, Node *adr) : Node(0,mem,adr) {}
virtual int Opcode() const;
virtual uint ideal_reg() const { return NotAMachineReg; }
virtual uint match_edge(uint idx) const { return idx==2; }
virtual const Type *bottom_type() const { return ( AllocatePrefetchStyle == 3 ) ? Type::MEMORY : Type::ABIO; }
};