Mercurial > hg > graal-compiler
diff src/share/vm/opto/block.hpp @ 14412:e2722a66aba7
Merge
author | kvn |
---|---|
date | Thu, 05 Sep 2013 11:04:39 -0700 |
parents | adb9a7d94cb5 |
children | 650868c062a9 |
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--- a/src/share/vm/opto/block.hpp Thu Aug 22 09:39:54 2013 -0700 +++ b/src/share/vm/opto/block.hpp Thu Sep 05 11:04:39 2013 -0700 @@ -48,13 +48,12 @@ friend class VMStructs; uint _size; // allocated size, as opposed to formal limit debug_only(uint _limit;) // limit to formal domain + Arena *_arena; // Arena to allocate in protected: Block **_blocks; void grow( uint i ); // Grow array node to fit public: - Arena *_arena; // Arena to allocate in - Block_Array(Arena *a) : _arena(a), _size(OptoBlockListSize) { debug_only(_limit=0); _blocks = NEW_ARENA_ARRAY( a, Block *, OptoBlockListSize ); @@ -77,7 +76,7 @@ public: uint _cnt; Block_List() : Block_Array(Thread::current()->resource_area()), _cnt(0) {} - void push( Block *b ) { map(_cnt++,b); } + void push( Block *b ) { map(_cnt++,b); } Block *pop() { return _blocks[--_cnt]; } Block *rpop() { Block *b = _blocks[0]; _blocks[0]=_blocks[--_cnt]; return b;} void remove( uint i ); @@ -284,15 +283,15 @@ // helper function that adds caller save registers to MachProjNode void add_call_kills(MachProjNode *proj, RegMask& regs, const char* save_policy, bool exclude_soe); // Schedule a call next in the block - uint sched_call(Matcher &matcher, Block_Array &bbs, uint node_cnt, Node_List &worklist, GrowableArray<int> &ready_cnt, MachCallNode *mcall, VectorSet &next_call); + uint sched_call(Matcher &matcher, PhaseCFG* cfg, uint node_cnt, Node_List &worklist, GrowableArray<int> &ready_cnt, MachCallNode *mcall, VectorSet &next_call); // Perform basic-block local scheduling Node *select(PhaseCFG *cfg, Node_List &worklist, GrowableArray<int> &ready_cnt, VectorSet &next_call, uint sched_slot); - void set_next_call( Node *n, VectorSet &next_call, Block_Array &bbs ); - void needed_for_next_call(Node *this_call, VectorSet &next_call, Block_Array &bbs); + void set_next_call( Node *n, VectorSet &next_call, PhaseCFG* cfg); + void needed_for_next_call(Node *this_call, VectorSet &next_call, PhaseCFG* cfg); bool schedule_local(PhaseCFG *cfg, Matcher &m, GrowableArray<int> &ready_cnt, VectorSet &next_call); // Cleanup if any code lands between a Call and his Catch - void call_catch_cleanup(Block_Array &bbs, Compile *C); + void call_catch_cleanup(PhaseCFG* cfg, Compile *C); // Detect implicit-null-check opportunities. Basically, find NULL checks // with suitable memory ops nearby. Use the memory op to do the NULL check. // I can generate a memory op if there is not one nearby. @@ -331,15 +330,15 @@ // Use frequency calculations and code shape to predict if the block // is uncommon. - bool is_uncommon( Block_Array &bbs ) const; + bool is_uncommon(PhaseCFG* cfg) const; #ifndef PRODUCT // Debugging print of basic block void dump_bidx(const Block* orig, outputStream* st = tty) const; - void dump_pred(const Block_Array *bbs, Block* orig, outputStream* st = tty) const; - void dump_head( const Block_Array *bbs, outputStream* st = tty ) const; + void dump_pred(const PhaseCFG* cfg, Block* orig, outputStream* st = tty) const; + void dump_head(const PhaseCFG* cfg, outputStream* st = tty) const; void dump() const; - void dump( const Block_Array *bbs ) const; + void dump(const PhaseCFG* cfg) const; #endif }; @@ -349,14 +348,77 @@ class PhaseCFG : public Phase { friend class VMStructs; private: + + // Root of whole program + RootNode* _root; + + // The block containing the root node + Block* _root_block; + + // List of basic blocks that are created during CFG creation + Block_List _blocks; + + // Count of basic blocks + uint _number_of_blocks; + + // Arena for the blocks to be stored in + Arena* _block_arena; + + // The matcher for this compilation + Matcher& _matcher; + + // Map nodes to owning basic block + Block_Array _node_to_block_mapping; + + // Loop from the root + CFGLoop* _root_loop; + + // Outmost loop frequency + float _outer_loop_frequency; + + // Per node latency estimation, valid only during GCM + GrowableArray<uint>* _node_latency; + // Build a proper looking cfg. Return count of basic blocks uint build_cfg(); - // Perform DFS search. + // Build the dominator tree so that we know where we can move instructions + void build_dominator_tree(); + + // Estimate block frequencies based on IfNode probabilities, so that we know where we want to move instructions + void estimate_block_frequency(); + + // Global Code Motion. See Click's PLDI95 paper. Place Nodes in specific + // basic blocks; i.e. _node_to_block_mapping now maps _idx for all Nodes to some Block. + // Move nodes to ensure correctness from GVN and also try to move nodes out of loops. + void global_code_motion(); + + // Schedule Nodes early in their basic blocks. + bool schedule_early(VectorSet &visited, Node_List &roots); + + // For each node, find the latest block it can be scheduled into + // and then select the cheapest block between the latest and earliest + // block to place the node. + void schedule_late(VectorSet &visited, Node_List &stack); + + // Compute the (backwards) latency of a node from a single use + int latency_from_use(Node *n, const Node *def, Node *use); + + // Compute the (backwards) latency of a node from the uses of this instruction + void partial_latency_of_defs(Node *n); + + // Compute the instruction global latency with a backwards walk + void compute_latencies_backwards(VectorSet &visited, Node_List &stack); + + // Pick a block between early and late that is a cheaper alternative + // to late. Helper for schedule_late. + Block* hoist_to_cheaper_block(Block* LCA, Block* early, Node* self); + + // Perform a Depth First Search (DFS). // Setup 'vertex' as DFS to vertex mapping. // Setup 'semi' as vertex to DFS mapping. // Set 'parent' to DFS parent. - uint DFS( Tarjan *tarjan ); + uint do_DFS(Tarjan* tarjan, uint rpo_counter); // Helper function to insert a node into a block void schedule_node_into_block( Node *n, Block *b ); @@ -367,79 +429,18 @@ void schedule_pinned_nodes( VectorSet &visited ); // I'll need a few machine-specific GotoNodes. Clone from this one. - MachNode *_goto; + // Used when building the CFG and creating end nodes for blocks. + MachNode* _goto; Block* insert_anti_dependences(Block* LCA, Node* load, bool verify = false); void verify_anti_dependences(Block* LCA, Node* load) { - assert(LCA == _bbs[load->_idx], "should already be scheduled"); + assert(LCA == get_block_for_node(load), "should already be scheduled"); insert_anti_dependences(LCA, load, true); } - public: - PhaseCFG( Arena *a, RootNode *r, Matcher &m ); - - uint _num_blocks; // Count of basic blocks - Block_List _blocks; // List of basic blocks - RootNode *_root; // Root of whole program - Block_Array _bbs; // Map Nodes to owning Basic Block - Block *_broot; // Basic block of root - uint _rpo_ctr; - CFGLoop* _root_loop; - float _outer_loop_freq; // Outmost loop frequency - - // Per node latency estimation, valid only during GCM - GrowableArray<uint> *_node_latency; - -#ifndef PRODUCT - bool _trace_opto_pipelining; // tracing flag -#endif - -#ifdef ASSERT - Unique_Node_List _raw_oops; -#endif - - // Build dominators - void Dominators(); - - // Estimate block frequencies based on IfNode probabilities - void Estimate_Block_Frequency(); - - // Global Code Motion. See Click's PLDI95 paper. Place Nodes in specific - // basic blocks; i.e. _bbs now maps _idx for all Nodes to some Block. - void GlobalCodeMotion( Matcher &m, uint unique, Node_List &proj_list ); - - // Compute the (backwards) latency of a node from the uses - void latency_from_uses(Node *n); - - // Compute the (backwards) latency of a node from a single use - int latency_from_use(Node *n, const Node *def, Node *use); - - // Compute the (backwards) latency of a node from the uses of this instruction - void partial_latency_of_defs(Node *n); - - // Schedule Nodes early in their basic blocks. - bool schedule_early(VectorSet &visited, Node_List &roots); - - // For each node, find the latest block it can be scheduled into - // and then select the cheapest block between the latest and earliest - // block to place the node. - void schedule_late(VectorSet &visited, Node_List &stack); - - // Pick a block between early and late that is a cheaper alternative - // to late. Helper for schedule_late. - Block* hoist_to_cheaper_block(Block* LCA, Block* early, Node* self); - - // Compute the instruction global latency with a backwards walk - void ComputeLatenciesBackwards(VectorSet &visited, Node_List &stack); - - // Set loop alignment - void set_loop_alignment(); - - // Remove empty basic blocks - void remove_empty(); - void fixup_flow(); bool move_to_next(Block* bx, uint b_index); void move_to_end(Block* bx, uint b_index); + void insert_goto_at(uint block_no, uint succ_no); // Check for NeverBranch at block end. This needs to become a GOTO to the @@ -451,10 +452,106 @@ CFGLoop* create_loop_tree(); - // Insert a node into a block, and update the _bbs - void insert( Block *b, uint idx, Node *n ) { + #ifndef PRODUCT + bool _trace_opto_pipelining; // tracing flag + #endif + + public: + PhaseCFG(Arena* arena, RootNode* root, Matcher& matcher); + + void set_latency_for_node(Node* node, int latency) { + _node_latency->at_put_grow(node->_idx, latency); + } + + uint get_latency_for_node(Node* node) { + return _node_latency->at_grow(node->_idx); + } + + // Get the outer most frequency + float get_outer_loop_frequency() const { + return _outer_loop_frequency; + } + + // Get the root node of the CFG + RootNode* get_root_node() const { + return _root; + } + + // Get the block of the root node + Block* get_root_block() const { + return _root_block; + } + + // Add a block at a position and moves the later ones one step + void add_block_at(uint pos, Block* block) { + _blocks.insert(pos, block); + _number_of_blocks++; + } + + // Adds a block to the top of the block list + void add_block(Block* block) { + _blocks.push(block); + _number_of_blocks++; + } + + // Clear the list of blocks + void clear_blocks() { + _blocks.reset(); + _number_of_blocks = 0; + } + + // Get the block at position pos in _blocks + Block* get_block(uint pos) const { + return _blocks[pos]; + } + + // Number of blocks + uint number_of_blocks() const { + return _number_of_blocks; + } + + // set which block this node should reside in + void map_node_to_block(const Node* node, Block* block) { + _node_to_block_mapping.map(node->_idx, block); + } + + // removes the mapping from a node to a block + void unmap_node_from_block(const Node* node) { + _node_to_block_mapping.map(node->_idx, NULL); + } + + // get the block in which this node resides + Block* get_block_for_node(const Node* node) const { + return _node_to_block_mapping[node->_idx]; + } + + // does this node reside in a block; return true + bool has_block(const Node* node) const { + return (_node_to_block_mapping.lookup(node->_idx) != NULL); + } + +#ifdef ASSERT + Unique_Node_List _raw_oops; +#endif + + // Do global code motion by first building dominator tree and estimate block frequency + // Returns true on success + bool do_global_code_motion(); + + // Compute the (backwards) latency of a node from the uses + void latency_from_uses(Node *n); + + // Set loop alignment + void set_loop_alignment(); + + // Remove empty basic blocks + void remove_empty_blocks(); + void fixup_flow(); + + // Insert a node into a block at index and map the node to the block + void insert(Block *b, uint idx, Node *n) { b->_nodes.insert( idx, n ); - _bbs.map( n->_idx, b ); + map_node_to_block(n, b); } #ifndef PRODUCT @@ -543,7 +640,7 @@ _child(NULL), _exit_prob(1.0f) {} CFGLoop* parent() { return _parent; } - void push_pred(Block* blk, int i, Block_List& worklist, Block_Array& node_to_blk); + void push_pred(Block* blk, int i, Block_List& worklist, PhaseCFG* cfg); void add_member(CFGElement *s) { _members.push(s); } void add_nested_loop(CFGLoop* cl); Block* head() {