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8028515: PPPC64 (part 113.2): opto: Introduce LoadFence/StoreFence

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Use new nodes for loadFence/storeFence intrinsics in C2.

Reviewed-by: kvn, dholmes
This commit is contained in:
Goetz Lindenmaier 2013-11-26 18:38:19 -08:00
parent b4ded0bc2e
commit fe89766184
11 changed files with 135 additions and 21 deletions
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22
hotspot/src/share/vm/opto/memnode.hpp
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@ -994,6 +994,17 @@ public:
virtual int Opcode() const;
};
// "Acquire" - no following ref can move before (but earlier refs can
// follow, like an early Load stalled in cache). Requires multi-cpu
// visibility. Inserted independ of any load, as required
// for intrinsic sun.misc.Unsafe.loadFence().
class LoadFenceNode: public MemBarNode {
public:
LoadFenceNode(Compile* C, int alias_idx, Node* precedent)
: MemBarNode(C, alias_idx, precedent) {}
virtual int Opcode() const;
};
// "Release" - no earlier ref can move after (but later refs can move
// up, like a speculative pipelined cache-hitting Load). Requires
// multi-cpu visibility. Inserted before a volatile store.
@ -1004,6 +1015,17 @@ public:
virtual int Opcode() const;
};
// "Release" - no earlier ref can move after (but later refs can move
// up, like a speculative pipelined cache-hitting Load). Requires
// multi-cpu visibility. Inserted independent of any store, as required
// for intrinsic sun.misc.Unsafe.storeFence().
class StoreFenceNode: public MemBarNode {
public:
StoreFenceNode(Compile* C, int alias_idx, Node* precedent)
: MemBarNode(C, alias_idx, precedent) {}
virtual int Opcode() const;
};
// "Acquire" - no following ref can move before (but earlier refs can
// follow, like an early Load stalled in cache). Requires multi-cpu
// visibility. Inserted after a FastLock.