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comparison src/share/vm/opto/memnode.cpp @ 36:f34d9da7acb2

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6667618: disable LoadL->ConvL2I ==> LoadI optimization Summary: this optimization causes problems (sizes of Load and Store nodes do not match) for objects initialization code and Escape Analysis Reviewed-by: jrose, never
author kvn
date Fri, 29 Feb 2008 19:57:41 -0800
parents d5fc211aea19
children d821d920b465
comparison
equal deleted inserted replaced
35:e2ae28d2ce91 36:f34d9da7acb2
106 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL 106 if( t_adr == Type::TOP ) return NodeSentinel; // caller will return NULL
107 107
108 // Avoid independent memory operations 108 // Avoid independent memory operations
109 Node* old_mem = mem; 109 Node* old_mem = mem;
110 110
111 if (mem->is_Proj() && mem->in(0)->is_Initialize()) { 111 // The code which unhooks non-raw memories from complete (macro-expanded)
112 InitializeNode* init = mem->in(0)->as_Initialize(); 112 // initializations was removed. After macro-expansion all stores catched
113 if (init->is_complete()) { // i.e., after macro expansion 113 // by Initialize node became raw stores and there is no information
114 const TypePtr* tp = t_adr->is_ptr(); 114 // which memory slices they modify. So it is unsafe to move any memory
115 uint alias_idx = phase->C->get_alias_index(tp); 115 // operation above these stores. Also in most cases hooked non-raw memories
116 // Free this slice from the init. It was hooked, temporarily, 116 // were already unhooked by using information from detect_ptr_independence()
117 // by GraphKit::set_output_for_allocation. 117 // and find_previous_store().
118 if (alias_idx > Compile::AliasIdxRaw) {
119 mem = init->memory(alias_idx);
120 // ...but not with the raw-pointer slice.
121 }
122 }
123 }
124 118
125 if (mem->is_MergeMem()) { 119 if (mem->is_MergeMem()) {
126 MergeMemNode* mmem = mem->as_MergeMem(); 120 MergeMemNode* mmem = mem->as_MergeMem();
127 const TypePtr *tp = t_adr->is_ptr(); 121 const TypePtr *tp = t_adr->is_ptr();
128 uint alias_idx = phase->C->get_alias_index(tp); 122 uint alias_idx = phase->C->get_alias_index(tp);