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7032963: StoreCM shouldn't participate in store elimination

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Reviewed-by: kvn
This commit is contained in:
Tom Rodriguez 2011-04-05 19:14:03 -07:00
parent 154f0709bd
commit aac4647e6e
4 changed files with 88 additions and 22 deletions
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9
hotspot/src/share/vm/opto/memnode.cpp
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@ -2159,9 +2159,12 @@ Node *StoreNode::Ideal(PhaseGVN *phase, bool can_reshape) {
Node* mem = in(MemNode::Memory);
Node* address = in(MemNode::Address);
// Back-to-back stores to same address? Fold em up.
// Generally unsafe if I have intervening uses...
if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) {
// Back-to-back stores to same address? Fold em up. Generally
// unsafe if I have intervening uses... Also disallowed for StoreCM
// since they must follow each StoreP operation. Redundant StoreCMs
// are eliminated just before matching in final_graph_reshape.
if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address) &&
mem->Opcode() != Op_StoreCM) {
// Looking at a dead closed cycle of memory?
assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal");