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comparison src/share/vm/opto/memnode.cpp @ 3248:e6beb62de02d

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7032963: StoreCM shouldn't participate in store elimination Reviewed-by: kvn
author never
date Tue, 05 Apr 2011 19:14:03 -0700
parents b099aaf51bf8
children 92add02409c9
comparison
equal deleted inserted replaced
2436:8f1042ff784d 3248:e6beb62de02d
2157 if (p) return (p == NodeSentinel) ? NULL : p; 2157 if (p) return (p == NodeSentinel) ? NULL : p;
2158 2158
2159 Node* mem = in(MemNode::Memory); 2159 Node* mem = in(MemNode::Memory);
2160 Node* address = in(MemNode::Address); 2160 Node* address = in(MemNode::Address);
2161 2161
2162 // Back-to-back stores to same address? Fold em up. 2162 // Back-to-back stores to same address? Fold em up. Generally
2163 // Generally unsafe if I have intervening uses... 2163 // unsafe if I have intervening uses... Also disallowed for StoreCM
2164 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address)) { 2164 // since they must follow each StoreP operation. Redundant StoreCMs
2165 // are eliminated just before matching in final_graph_reshape.
2166 if (mem->is_Store() && phase->eqv_uncast(mem->in(MemNode::Address), address) &&
2167 mem->Opcode() != Op_StoreCM) {
2165 // Looking at a dead closed cycle of memory? 2168 // Looking at a dead closed cycle of memory?
2166 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal"); 2169 assert(mem != mem->in(MemNode::Memory), "dead loop in StoreNode::Ideal");
2167 2170
2168 assert(Opcode() == mem->Opcode() || 2171 assert(Opcode() == mem->Opcode() ||
2169 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw, 2172 phase->C->get_alias_index(adr_type()) == Compile::AliasIdxRaw,