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/* Integrated Register Allocator (IRA) intercommunication header file. Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc. Contributed by Vladimir Makarov <vmakarov@redhat.com>. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ #include "cfgloop.h" #include "ira.h" #include "alloc-pool.h" /* To provide consistency in naming, all IRA external variables, functions, common typedefs start with prefix ira_. */ #ifdef ENABLE_CHECKING #define ENABLE_IRA_CHECKING #endif #ifdef ENABLE_IRA_CHECKING #define ira_assert(c) gcc_assert (c) #else /* Always define and include C, so that warnings for empty body in an ‘if’ statement and unused variable do not occur. */ #define ira_assert(c) ((void)(0 && (c))) #endif /* Compute register frequency from edge frequency FREQ. It is analogous to REG_FREQ_FROM_BB. When optimizing for size, or profile driven feedback is available and the function is never executed, frequency is always equivalent. Otherwise rescale the edge frequency. */ #define REG_FREQ_FROM_EDGE_FREQ(freq) \ (optimize_size || (flag_branch_probabilities && !ENTRY_BLOCK_PTR->count) \ ? REG_FREQ_MAX : (freq * REG_FREQ_MAX / BB_FREQ_MAX) \ ? (freq * REG_FREQ_MAX / BB_FREQ_MAX) : 1) /* All natural loops. */ extern struct loops ira_loops; /* A modified value of flag `-fira-verbose' used internally. */ extern int internal_flag_ira_verbose; /* Dump file of the allocator if it is not NULL. */ extern FILE *ira_dump_file; /* Typedefs for pointers to allocno live range, allocno, and copy of allocnos. */ typedef struct ira_allocno_live_range *allocno_live_range_t; typedef struct ira_allocno *ira_allocno_t; typedef struct ira_allocno_copy *ira_copy_t; /* Definition of vector of allocnos and copies. */ DEF_VEC_P(ira_allocno_t); DEF_VEC_ALLOC_P(ira_allocno_t, heap); DEF_VEC_P(ira_copy_t); DEF_VEC_ALLOC_P(ira_copy_t, heap); /* Typedef for pointer to the subsequent structure. */ typedef struct ira_loop_tree_node *ira_loop_tree_node_t; /* In general case, IRA is a regional allocator. The regions are nested and form a tree. Currently regions are natural loops. The following structure describes loop tree node (representing basic block or loop). We need such tree because the loop tree from cfgloop.h is not convenient for the optimization: basic blocks are not a part of the tree from cfgloop.h. We also use the nodes for storing additional information about basic blocks/loops for the register allocation purposes. */ struct ira_loop_tree_node { /* The node represents basic block if children == NULL. */ basic_block bb; /* NULL for loop. */ struct loop *loop; /* NULL for BB. */ /* NEXT/SUBLOOP_NEXT is the next node/loop-node of the same parent. SUBLOOP_NEXT is always NULL for BBs. */ ira_loop_tree_node_t subloop_next, next; /* CHILDREN/SUBLOOPS is the first node/loop-node immediately inside the node. They are NULL for BBs. */ ira_loop_tree_node_t subloops, children; /* The node immediately containing given node. */ ira_loop_tree_node_t parent; /* Loop level in range [0, ira_loop_tree_height). */ int level; /* All the following members are defined only for nodes representing loops. */ /* True if the loop was marked for removal from the register allocation. */ bool to_remove_p; /* Allocnos in the loop corresponding to their regnos. If it is NULL the loop does not form a separate register allocation region (e.g. because it has abnormal enter/exit edges and we can not put code for register shuffling on the edges if a different allocation is used for a pseudo-register on different sides of the edges). Caps are not in the map (remember we can have more one cap with the same regno in a region). */ ira_allocno_t *regno_allocno_map; /* True if there is an entry to given loop not from its parent (or grandparent) basic block. For example, it is possible for two adjacent loops inside another loop. */ bool entered_from_non_parent_p; /* Maximal register pressure inside loop for given register class (defined only for the cover classes). */ int reg_pressure[N_REG_CLASSES]; /* Numbers of allocnos referred or living in the loop node (except for its subloops). */ bitmap all_allocnos; /* Numbers of allocnos living at the loop borders. */ bitmap border_allocnos; /* Regnos of pseudos modified in the loop node (including its subloops). */ bitmap modified_regnos; /* Numbers of copies referred in the corresponding loop. */ bitmap local_copies; }; /* The root of the loop tree corresponding to the all function. */ extern ira_loop_tree_node_t ira_loop_tree_root; /* Height of the loop tree. */ extern int ira_loop_tree_height; /* All nodes representing basic blocks are referred through the following array. We can not use basic block member `aux' for this because it is used for insertion of insns on edges. */ extern ira_loop_tree_node_t ira_bb_nodes; /* Two access macros to the nodes representing basic blocks. */ #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) #define IRA_BB_NODE_BY_INDEX(index) __extension__ \ (({ ira_loop_tree_node_t _node = (&ira_bb_nodes[index]); \ if (_node->children != NULL || _node->loop != NULL || _node->bb == NULL)\ { \ fprintf (stderr, \ "\n%s: %d: error in %s: it is not a block node\n", \ __FILE__, __LINE__, __FUNCTION__); \ gcc_unreachable (); \ } \ _node; })) #else #define IRA_BB_NODE_BY_INDEX(index) (&ira_bb_nodes[index]) #endif #define IRA_BB_NODE(bb) IRA_BB_NODE_BY_INDEX ((bb)->index) /* All nodes representing loops are referred through the following array. */ extern ira_loop_tree_node_t ira_loop_nodes; /* Two access macros to the nodes representing loops. */ #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) #define IRA_LOOP_NODE_BY_INDEX(index) __extension__ \ (({ ira_loop_tree_node_t const _node = (&ira_loop_nodes[index]);\ if (_node->children == NULL || _node->bb != NULL || _node->loop == NULL)\ { \ fprintf (stderr, \ "\n%s: %d: error in %s: it is not a loop node\n", \ __FILE__, __LINE__, __FUNCTION__); \ gcc_unreachable (); \ } \ _node; })) #else #define IRA_LOOP_NODE_BY_INDEX(index) (&ira_loop_nodes[index]) #endif #define IRA_LOOP_NODE(loop) IRA_LOOP_NODE_BY_INDEX ((loop)->num) /* The structure describes program points where a given allocno lives. To save memory we store allocno conflicts only for the same cover class allocnos which is enough to assign hard registers. To find conflicts for other allocnos (e.g. to assign stack memory slot) we use the live ranges. If the live ranges of two allocnos are intersected, the allocnos are in conflict. */ struct ira_allocno_live_range { /* Allocno whose live range is described by given structure. */ ira_allocno_t allocno; /* Program point range. */ int start, finish; /* Next structure describing program points where the allocno lives. */ allocno_live_range_t next; /* Pointer to structures with the same start/finish. */ allocno_live_range_t start_next, finish_next; }; /* Program points are enumerated by numbers from range 0..IRA_MAX_POINT-1. There are approximately two times more program points than insns. Program points are places in the program where liveness info can be changed. In most general case (there are more complicated cases too) some program points correspond to places where input operand dies and other ones correspond to places where output operands are born. */ extern int ira_max_point; /* Arrays of size IRA_MAX_POINT mapping a program point to the allocno live ranges with given start/finish point. */ extern allocno_live_range_t *ira_start_point_ranges, *ira_finish_point_ranges; /* A structure representing an allocno (allocation entity). Allocno represents a pseudo-register in an allocation region. If pseudo-register does not live in a region but it lives in the nested regions, it is represented in the region by special allocno called *cap*. There may be more one cap representing the same pseudo-register in region. It means that the corresponding pseudo-register lives in more one non-intersected subregion. */ struct ira_allocno { /* The allocno order number starting with 0. Each allocno has an unique number and the number is never changed for the allocno. */ int num; /* Regno for allocno or cap. */ int regno; /* Mode of the allocno which is the mode of the corresponding pseudo-register. */ enum machine_mode mode; /* Hard register assigned to given allocno. Negative value means that memory was allocated to the allocno. During the reload, spilled allocno has value equal to the corresponding stack slot number (0, ...) - 2. Value -1 is used for allocnos spilled by the reload (at this point pseudo-register has only one allocno) which did not get stack slot yet. */ int hard_regno; /* Final rtx representation of the allocno. */ rtx reg; /* Allocnos with the same regno are linked by the following member. Allocnos corresponding to inner loops are first in the list (it corresponds to depth-first traverse of the loops). */ ira_allocno_t next_regno_allocno; /* There may be different allocnos with the same regno in different regions. Allocnos are bound to the corresponding loop tree node. Pseudo-register may have only one regular allocno with given loop tree node but more than one cap (see comments above). */ ira_loop_tree_node_t loop_tree_node; /* Accumulated usage references of the allocno. Here and below, word 'accumulated' means info for given region and all nested subregions. In this case, 'accumulated' means sum of references of the corresponding pseudo-register in this region and in all nested subregions recursively. */ int nrefs; /* Accumulated frequency of usage of the allocno. */ int freq; /* Register class which should be used for allocation for given allocno. NO_REGS means that we should use memory. */ enum reg_class cover_class; /* Minimal accumulated and updated costs of usage register of the cover class for the allocno. */ int cover_class_cost, updated_cover_class_cost; /* Minimal accumulated, and updated costs of memory for the allocno. At the allocation start, the original and updated costs are equal. The updated cost may be changed after finishing allocation in a region and starting allocation in a subregion. The change reflects the cost of spill/restore code on the subregion border if we assign memory to the pseudo in the subregion. */ int memory_cost, updated_memory_cost; /* Accumulated number of points where the allocno lives and there is excess pressure for its class. Excess pressure for a register class at some point means that there are more allocnos of given register class living at the point than number of hard-registers of the class available for the allocation. */ int excess_pressure_points_num; /* Copies to other non-conflicting allocnos. The copies can represent move insn or potential move insn usually because of two operand insn constraints. */ ira_copy_t allocno_copies; /* It is a allocno (cap) representing given allocno on upper loop tree level. */ ira_allocno_t cap; /* It is a link to allocno (cap) on lower loop level represented by given cap. Null if given allocno is not a cap. */ ira_allocno_t cap_member; /* Coalesced allocnos form a cyclic list. One allocno given by FIRST_COALESCED_ALLOCNO represents all coalesced allocnos. The list is chained by NEXT_COALESCED_ALLOCNO. */ ira_allocno_t first_coalesced_allocno; ira_allocno_t next_coalesced_allocno; /* Pointer to structures describing at what program point the allocno lives. We always maintain the list in such way that *the ranges in the list are not intersected and ordered by decreasing their program points*. */ allocno_live_range_t live_ranges; /* Before building conflicts the two member values are correspondingly minimal and maximal points of the accumulated allocno live ranges. After building conflicts the values are correspondingly minimal and maximal conflict ids of allocnos with which given allocno can conflict. */ int min, max; /* Vector of accumulated conflicting allocnos with NULL end marker (if CONFLICT_VEC_P is true) or conflict bit vector otherwise. Only allocnos with the same cover class are in the vector or in the bit vector. */ void *conflict_allocno_array; /* The unique member value represents given allocno in conflict bit vectors. */ int conflict_id; /* Allocated size of the previous array. */ unsigned int conflict_allocno_array_size; /* Initial and accumulated hard registers conflicting with this allocno and as a consequences can not be assigned to the allocno. All non-allocatable hard regs and hard regs of cover classes different from given allocno one are included in the sets. */ HARD_REG_SET conflict_hard_regs, total_conflict_hard_regs; /* Number of accumulated conflicts in the vector of conflicting allocnos. */ int conflict_allocnos_num; /* Accumulated frequency of calls which given allocno intersects. */ int call_freq; /* Accumulated number of the intersected calls. */ int calls_crossed_num; /* TRUE if the allocno assigned to memory was a destination of removed move (see ira-emit.c) at loop exit because the value of the corresponding pseudo-register is not changed inside the loop. */ unsigned int mem_optimized_dest_p : 1; /* TRUE if the corresponding pseudo-register has disjoint live ranges and the other allocnos of the pseudo-register except this one changed REG. */ unsigned int somewhere_renamed_p : 1; /* TRUE if allocno with the same REGNO in a subregion has been renamed, in other words, got a new pseudo-register. */ unsigned int child_renamed_p : 1; /* During the reload, value TRUE means that we should not reassign a hard register to the allocno got memory earlier. It is set up when we removed memory-memory move insn before each iteration of the reload. */ unsigned int dont_reassign_p : 1; #ifdef STACK_REGS /* Set to TRUE if allocno can't be assigned to the stack hard register correspondingly in this region and area including the region and all its subregions recursively. */ unsigned int no_stack_reg_p : 1, total_no_stack_reg_p : 1; #endif /* TRUE value means that there is no sense to spill the allocno during coloring because the spill will result in additional reloads in reload pass. */ unsigned int bad_spill_p : 1; /* TRUE value means that the allocno was not removed yet from the conflicting graph during colouring. */ unsigned int in_graph_p : 1; /* TRUE if a hard register or memory has been assigned to the allocno. */ unsigned int assigned_p : 1; /* TRUE if it is put on the stack to make other allocnos colorable. */ unsigned int may_be_spilled_p : 1; /* TRUE if the allocno was removed from the splay tree used to choose allocn for spilling (see ira-color.c::. */ unsigned int splay_removed_p : 1; /* TRUE if conflicts for given allocno are represented by vector of pointers to the conflicting allocnos. Otherwise, we use a bit vector where a bit with given index represents allocno with the same number. */ unsigned int conflict_vec_p : 1; /* Non NULL if we remove restoring value from given allocno to MEM_OPTIMIZED_DEST at loop exit (see ira-emit.c) because the allocno value is not changed inside the loop. */ ira_allocno_t mem_optimized_dest; /* Array of usage costs (accumulated and the one updated during coloring) for each hard register of the allocno cover class. The member value can be NULL if all costs are the same and equal to COVER_CLASS_COST. For example, the costs of two different hard registers can be different if one hard register is callee-saved and another one is callee-used and the allocno lives through calls. Another example can be case when for some insn the corresponding pseudo-register value should be put in specific register class (e.g. AREG for x86) which is a strict subset of the allocno cover class (GENERAL_REGS for x86). We have updated costs to reflect the situation when the usage cost of a hard register is decreased because the allocno is connected to another allocno by a copy and the another allocno has been assigned to the hard register. */ int *hard_reg_costs, *updated_hard_reg_costs; /* Array of decreasing costs (accumulated and the one updated during coloring) for allocnos conflicting with given allocno for hard regno of the allocno cover class. The member value can be NULL if all costs are the same. These costs are used to reflect preferences of other allocnos not assigned yet during assigning to given allocno. */ int *conflict_hard_reg_costs, *updated_conflict_hard_reg_costs; /* Size (in hard registers) of the same cover class allocnos with TRUE in_graph_p value and conflicting with given allocno during each point of graph coloring. */ int left_conflicts_size; /* Number of hard registers of the allocno cover class really available for the allocno allocation. */ int available_regs_num; /* Allocnos in a bucket (used in coloring) chained by the following two members. */ ira_allocno_t next_bucket_allocno; ira_allocno_t prev_bucket_allocno; /* Used for temporary purposes. */ int temp; }; /* All members of the allocno structures should be accessed only through the following macros. */ #define ALLOCNO_NUM(A) ((A)->num) #define ALLOCNO_REGNO(A) ((A)->regno) #define ALLOCNO_REG(A) ((A)->reg) #define ALLOCNO_NEXT_REGNO_ALLOCNO(A) ((A)->next_regno_allocno) #define ALLOCNO_LOOP_TREE_NODE(A) ((A)->loop_tree_node) #define ALLOCNO_CAP(A) ((A)->cap) #define ALLOCNO_CAP_MEMBER(A) ((A)->cap_member) #define ALLOCNO_CONFLICT_ALLOCNO_ARRAY(A) ((A)->conflict_allocno_array) #define ALLOCNO_CONFLICT_ALLOCNO_ARRAY_SIZE(A) \ ((A)->conflict_allocno_array_size) #define ALLOCNO_CONFLICT_ALLOCNOS_NUM(A) \ ((A)->conflict_allocnos_num) #define ALLOCNO_CONFLICT_HARD_REGS(A) ((A)->conflict_hard_regs) #define ALLOCNO_TOTAL_CONFLICT_HARD_REGS(A) ((A)->total_conflict_hard_regs) #define ALLOCNO_NREFS(A) ((A)->nrefs) #define ALLOCNO_FREQ(A) ((A)->freq) #define ALLOCNO_HARD_REGNO(A) ((A)->hard_regno) #define ALLOCNO_CALL_FREQ(A) ((A)->call_freq) #define ALLOCNO_CALLS_CROSSED_NUM(A) ((A)->calls_crossed_num) #define ALLOCNO_MEM_OPTIMIZED_DEST(A) ((A)->mem_optimized_dest) #define ALLOCNO_MEM_OPTIMIZED_DEST_P(A) ((A)->mem_optimized_dest_p) #define ALLOCNO_SOMEWHERE_RENAMED_P(A) ((A)->somewhere_renamed_p) #define ALLOCNO_CHILD_RENAMED_P(A) ((A)->child_renamed_p) #define ALLOCNO_DONT_REASSIGN_P(A) ((A)->dont_reassign_p) #ifdef STACK_REGS #define ALLOCNO_NO_STACK_REG_P(A) ((A)->no_stack_reg_p) #define ALLOCNO_TOTAL_NO_STACK_REG_P(A) ((A)->total_no_stack_reg_p) #endif #define ALLOCNO_BAD_SPILL_P(A) ((A)->bad_spill_p) #define ALLOCNO_IN_GRAPH_P(A) ((A)->in_graph_p) #define ALLOCNO_ASSIGNED_P(A) ((A)->assigned_p) #define ALLOCNO_MAY_BE_SPILLED_P(A) ((A)->may_be_spilled_p) #define ALLOCNO_SPLAY_REMOVED_P(A) ((A)->splay_removed_p) #define ALLOCNO_CONFLICT_VEC_P(A) ((A)->conflict_vec_p) #define ALLOCNO_MODE(A) ((A)->mode) #define ALLOCNO_COPIES(A) ((A)->allocno_copies) #define ALLOCNO_HARD_REG_COSTS(A) ((A)->hard_reg_costs) #define ALLOCNO_UPDATED_HARD_REG_COSTS(A) ((A)->updated_hard_reg_costs) #define ALLOCNO_CONFLICT_HARD_REG_COSTS(A) \ ((A)->conflict_hard_reg_costs) #define ALLOCNO_UPDATED_CONFLICT_HARD_REG_COSTS(A) \ ((A)->updated_conflict_hard_reg_costs) #define ALLOCNO_LEFT_CONFLICTS_SIZE(A) ((A)->left_conflicts_size) #define ALLOCNO_COVER_CLASS(A) ((A)->cover_class) #define ALLOCNO_COVER_CLASS_COST(A) ((A)->cover_class_cost) #define ALLOCNO_UPDATED_COVER_CLASS_COST(A) ((A)->updated_cover_class_cost) #define ALLOCNO_MEMORY_COST(A) ((A)->memory_cost) #define ALLOCNO_UPDATED_MEMORY_COST(A) ((A)->updated_memory_cost) #define ALLOCNO_EXCESS_PRESSURE_POINTS_NUM(A) ((A)->excess_pressure_points_num) #define ALLOCNO_AVAILABLE_REGS_NUM(A) ((A)->available_regs_num) #define ALLOCNO_NEXT_BUCKET_ALLOCNO(A) ((A)->next_bucket_allocno) #define ALLOCNO_PREV_BUCKET_ALLOCNO(A) ((A)->prev_bucket_allocno) #define ALLOCNO_TEMP(A) ((A)->temp) #define ALLOCNO_FIRST_COALESCED_ALLOCNO(A) ((A)->first_coalesced_allocno) #define ALLOCNO_NEXT_COALESCED_ALLOCNO(A) ((A)->next_coalesced_allocno) #define ALLOCNO_LIVE_RANGES(A) ((A)->live_ranges) #define ALLOCNO_MIN(A) ((A)->min) #define ALLOCNO_MAX(A) ((A)->max) #define ALLOCNO_CONFLICT_ID(A) ((A)->conflict_id) /* Map regno -> allocnos with given regno (see comments for allocno member `next_regno_allocno'). */ extern ira_allocno_t *ira_regno_allocno_map; /* Array of references to all allocnos. The order number of the allocno corresponds to the index in the array. Removed allocnos have NULL element value. */ extern ira_allocno_t *ira_allocnos; /* Sizes of the previous array. */ extern int ira_allocnos_num; /* Map conflict id -> allocno with given conflict id (see comments for allocno member `conflict_id'). */ extern ira_allocno_t *ira_conflict_id_allocno_map; /* The following structure represents a copy of two allocnos. The copies represent move insns or potential move insns usually because of two operand insn constraints. To remove register shuffle, we also create copies between allocno which is output of an insn and allocno becoming dead in the insn. */ struct ira_allocno_copy { /* The unique order number of the copy node starting with 0. */ int num; /* Allocnos connected by the copy. The first allocno should have smaller order number than the second one. */ ira_allocno_t first, second; /* Execution frequency of the copy. */ int freq; bool constraint_p; /* It is a move insn which is an origin of the copy. The member value for the copy representing two operand insn constraints or for the copy created to remove register shuffle is NULL. In last case the copy frequency is smaller than the corresponding insn execution frequency. */ rtx insn; /* All copies with the same allocno as FIRST are linked by the two following members. */ ira_copy_t prev_first_allocno_copy, next_first_allocno_copy; /* All copies with the same allocno as SECOND are linked by the two following members. */ ira_copy_t prev_second_allocno_copy, next_second_allocno_copy; /* Region from which given copy is originated. */ ira_loop_tree_node_t loop_tree_node; }; /* Array of references to all copies. The order number of the copy corresponds to the index in the array. Removed copies have NULL element value. */ extern ira_copy_t *ira_copies; /* Size of the previous array. */ extern int ira_copies_num; /* The following structure describes a stack slot used for spilled pseudo-registers. */ struct ira_spilled_reg_stack_slot { /* pseudo-registers assigned to the stack slot. */ regset_head spilled_regs; /* RTL representation of the stack slot. */ rtx mem; /* Size of the stack slot. */ unsigned int width; }; /* The number of elements in the following array. */ extern int ira_spilled_reg_stack_slots_num; /* The following array contains info about spilled pseudo-registers stack slots used in current function so far. */ extern struct ira_spilled_reg_stack_slot *ira_spilled_reg_stack_slots; /* Correspondingly overall cost of the allocation, cost of the allocnos assigned to hard-registers, cost of the allocnos assigned to memory, cost of loads, stores and register move insns generated for pseudo-register live range splitting (see ira-emit.c). */ extern int ira_overall_cost; extern int ira_reg_cost, ira_mem_cost; extern int ira_load_cost, ira_store_cost, ira_shuffle_cost; extern int ira_move_loops_num, ira_additional_jumps_num; /* Maximal value of element of array ira_reg_class_nregs. */ extern int ira_max_nregs; /* The number of bits in each element of array used to implement a bit vector of allocnos and what type that element has. We use the largest integer format on the host machine. */ #define IRA_INT_BITS HOST_BITS_PER_WIDE_INT #define IRA_INT_TYPE HOST_WIDE_INT /* Set, clear or test bit number I in R, a bit vector of elements with minimal index and maximal index equal correspondingly to MIN and MAX. */ #if defined ENABLE_IRA_CHECKING && (GCC_VERSION >= 2007) #define SET_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ (({ int _min = (MIN), _max = (MAX), _i = (I); \ if (_i < _min || _i > _max) \ { \ fprintf (stderr, \ "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ gcc_unreachable (); \ } \ ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ |= ((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) #define CLEAR_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ (({ int _min = (MIN), _max = (MAX), _i = (I); \ if (_i < _min || _i > _max) \ { \ fprintf (stderr, \ "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ gcc_unreachable (); \ } \ ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ &= ~((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) #define TEST_ALLOCNO_SET_BIT(R, I, MIN, MAX) __extension__ \ (({ int _min = (MIN), _max = (MAX), _i = (I); \ if (_i < _min || _i > _max) \ { \ fprintf (stderr, \ "\n%s: %d: error in %s: %d not in range [%d,%d]\n", \ __FILE__, __LINE__, __FUNCTION__, _i, _min, _max); \ gcc_unreachable (); \ } \ ((R)[(unsigned) (_i - _min) / IRA_INT_BITS] \ & ((IRA_INT_TYPE) 1 << ((unsigned) (_i - _min) % IRA_INT_BITS))); })) #else #define SET_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ |= ((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) #define CLEAR_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ &= ~((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) #define TEST_ALLOCNO_SET_BIT(R, I, MIN, MAX) \ ((R)[(unsigned) ((I) - (MIN)) / IRA_INT_BITS] \ & ((IRA_INT_TYPE) 1 << ((unsigned) ((I) - (MIN)) % IRA_INT_BITS))) #endif /* The iterator for allocno set implemented ed as allocno bit vector. */ typedef struct { /* Array containing the allocno bit vector. */ IRA_INT_TYPE *vec; /* The number of the current element in the vector. */ unsigned int word_num; /* The number of bits in the bit vector. */ unsigned int nel; /* The current bit index of the bit vector. */ unsigned int bit_num; /* Index corresponding to the 1st bit of the bit vector. */ int start_val; /* The word of the bit vector currently visited. */ unsigned IRA_INT_TYPE word; } ira_allocno_set_iterator; /* Initialize the iterator I for allocnos bit vector VEC containing minimal and maximal values MIN and MAX. */ static inline void ira_allocno_set_iter_init (ira_allocno_set_iterator *i, IRA_INT_TYPE *vec, int min, int max) { i->vec = vec; i->word_num = 0; i->nel = max < min ? 0 : max - min + 1; i->start_val = min; i->bit_num = 0; i->word = i->nel == 0 ? 0 : vec[0]; } /* Return TRUE if we have more allocnos to visit, in which case *N is set to the allocno number to be visited. Otherwise, return FALSE. */ static inline bool ira_allocno_set_iter_cond (ira_allocno_set_iterator *i, int *n) { /* Skip words that are zeros. */ for (; i->word == 0; i->word = i->vec[i->word_num]) { i->word_num++; i->bit_num = i->word_num * IRA_INT_BITS; /* If we have reached the end, break. */ if (i->bit_num >= i->nel) return false; } /* Skip bits that are zero. */ for (; (i->word & 1) == 0; i->word >>= 1) i->bit_num++; *n = (int) i->bit_num + i->start_val; return true; } /* Advance to the next allocno in the set. */ static inline void ira_allocno_set_iter_next (ira_allocno_set_iterator *i) { i->word >>= 1; i->bit_num++; } /* Loop over all elements of allocno set given by bit vector VEC and their minimal and maximal values MIN and MAX. In each iteration, N is set to the number of next allocno. ITER is an instance of ira_allocno_set_iterator used to iterate the allocnos in the set. */ #define FOR_EACH_ALLOCNO_IN_SET(VEC, MIN, MAX, N, ITER) \ for (ira_allocno_set_iter_init (&(ITER), (VEC), (MIN), (MAX)); \ ira_allocno_set_iter_cond (&(ITER), &(N)); \ ira_allocno_set_iter_next (&(ITER))) /* ira.c: */ /* Map: hard regs X modes -> set of hard registers for storing value of given mode starting with given hard register. */ extern HARD_REG_SET ira_reg_mode_hard_regset [FIRST_PSEUDO_REGISTER][NUM_MACHINE_MODES]; /* Array analogous to macro REGISTER_MOVE_COST. Don't use ira_register_move_cost directly. Use function of ira_get_may_move_cost instead. */ extern move_table *ira_register_move_cost[MAX_MACHINE_MODE]; /* Similar to may_move_in_cost but it is calculated in IRA instead of regclass. Another difference we take only available hard registers into account to figure out that one register class is a subset of the another one. Don't use it directly. Use function of ira_get_may_move_cost instead. */ extern move_table *ira_may_move_in_cost[MAX_MACHINE_MODE]; /* Similar to may_move_out_cost but it is calculated in IRA instead of regclass. Another difference we take only available hard registers into account to figure out that one register class is a subset of the another one. Don't use it directly. Use function of ira_get_may_move_cost instead. */ extern move_table *ira_may_move_out_cost[MAX_MACHINE_MODE]; /* Register class subset relation: TRUE if the first class is a subset of the second one considering only hard registers available for the allocation. */ extern int ira_class_subset_p[N_REG_CLASSES][N_REG_CLASSES]; /* Index (in ira_class_hard_regs) for given register class and hard register (in general case a hard register can belong to several register classes). The index is negative for hard registers unavailable for the allocation. */ extern short ira_class_hard_reg_index[N_REG_CLASSES][FIRST_PSEUDO_REGISTER]; /* Array whose values are hard regset of hard registers available for the allocation of given register class whose HARD_REGNO_MODE_OK values for given mode are zero. */ extern HARD_REG_SET prohibited_class_mode_regs [N_REG_CLASSES][NUM_MACHINE_MODES]; /* Array whose values are hard regset of hard registers for which move of the hard register in given mode into itself is prohibited. */ extern HARD_REG_SET ira_prohibited_mode_move_regs[NUM_MACHINE_MODES]; /* The value is number of elements in the subsequent array. */ extern int ira_important_classes_num; /* The array containing non-empty classes (including non-empty cover classes) which are subclasses of cover classes. Such classes is important for calculation of the hard register usage costs. */ extern enum reg_class ira_important_classes[N_REG_CLASSES]; /* The array containing indexes of important classes in the previous array. The array elements are defined only for important classes. */ extern int ira_important_class_nums[N_REG_CLASSES]; /* The biggest important class inside of intersection of the two classes (that is calculated taking only hard registers available for allocation into account). If the both classes contain no hard registers available for allocation, the value is calculated with taking all hard-registers including fixed ones into account. */ extern enum reg_class ira_reg_class_intersect[N_REG_CLASSES][N_REG_CLASSES]; /* True if the two classes (that is calculated taking only hard registers available for allocation into account) are intersected. */ extern bool ira_reg_classes_intersect_p[N_REG_CLASSES][N_REG_CLASSES]; /* Classes with end marker LIM_REG_CLASSES which are intersected with given class (the first index). That includes given class itself. This is calculated taking only hard registers available for allocation into account. */ extern enum reg_class ira_reg_class_super_classes[N_REG_CLASSES][N_REG_CLASSES]; /* The biggest important class inside of union of the two classes (that is calculated taking only hard registers available for allocation into account). If the both classes contain no hard registers available for allocation, the value is calculated with taking all hard-registers including fixed ones into account. In other words, the value is the corresponding reg_class_subunion value. */ extern enum reg_class ira_reg_class_union[N_REG_CLASSES][N_REG_CLASSES]; extern void *ira_allocate (size_t); extern void *ira_reallocate (void *, size_t); extern void ira_free (void *addr); extern bitmap ira_allocate_bitmap (void); extern void ira_free_bitmap (bitmap); extern void ira_print_disposition (FILE *); extern void ira_debug_disposition (void); extern void ira_debug_class_cover (void); extern void ira_init_register_move_cost (enum machine_mode); /* The length of the two following arrays. */ extern int ira_reg_equiv_len; /* The element value is TRUE if the corresponding regno value is invariant. */ extern bool *ira_reg_equiv_invariant_p; /* The element value is equiv constant of given pseudo-register or NULL_RTX. */ extern rtx *ira_reg_equiv_const; /* ira-build.c */ /* The current loop tree node and its regno allocno map. */ extern ira_loop_tree_node_t ira_curr_loop_tree_node; extern ira_allocno_t *ira_curr_regno_allocno_map; extern void ira_debug_copy (ira_copy_t); extern void ira_debug_copies (void); extern void ira_debug_allocno_copies (ira_allocno_t); extern void ira_traverse_loop_tree (bool, ira_loop_tree_node_t, void (*) (ira_loop_tree_node_t), void (*) (ira_loop_tree_node_t)); extern ira_allocno_t ira_create_allocno (int, bool, ira_loop_tree_node_t); extern void ira_set_allocno_cover_class (ira_allocno_t, enum reg_class); extern bool ira_conflict_vector_profitable_p (ira_allocno_t, int); extern void ira_allocate_allocno_conflict_vec (ira_allocno_t, int); extern void ira_allocate_allocno_conflicts (ira_allocno_t, int); extern void ira_add_allocno_conflict (ira_allocno_t, ira_allocno_t); extern void ira_print_expanded_allocno (ira_allocno_t); extern allocno_live_range_t ira_create_allocno_live_range (ira_allocno_t, int, int, allocno_live_range_t); extern allocno_live_range_t ira_copy_allocno_live_range_list (allocno_live_range_t); extern allocno_live_range_t ira_merge_allocno_live_ranges (allocno_live_range_t, allocno_live_range_t); extern bool ira_allocno_live_ranges_intersect_p (allocno_live_range_t, allocno_live_range_t); extern void ira_finish_allocno_live_range (allocno_live_range_t); extern void ira_finish_allocno_live_range_list (allocno_live_range_t); extern void ira_free_allocno_updated_costs (ira_allocno_t); extern ira_copy_t ira_create_copy (ira_allocno_t, ira_allocno_t, int, bool, rtx, ira_loop_tree_node_t); extern void ira_add_allocno_copy_to_list (ira_copy_t); extern void ira_swap_allocno_copy_ends_if_necessary (ira_copy_t); extern void ira_remove_allocno_copy_from_list (ira_copy_t); extern ira_copy_t ira_add_allocno_copy (ira_allocno_t, ira_allocno_t, int, bool, rtx, ira_loop_tree_node_t); extern int *ira_allocate_cost_vector (enum reg_class); extern void ira_free_cost_vector (int *, enum reg_class); extern void ira_flattening (int, int); extern bool ira_build (bool); extern void ira_destroy (void); /* ira-costs.c */ extern void ira_init_costs_once (void); extern void ira_init_costs (void); extern void ira_finish_costs_once (void); extern void ira_costs (void); extern void ira_tune_allocno_costs_and_cover_classes (void); /* ira-lives.c */ extern void ira_rebuild_start_finish_chains (void); extern void ira_print_live_range_list (FILE *, allocno_live_range_t); extern void ira_debug_live_range_list (allocno_live_range_t); extern void ira_debug_allocno_live_ranges (ira_allocno_t); extern void ira_debug_live_ranges (void); extern void ira_create_allocno_live_ranges (void); extern void ira_compress_allocno_live_ranges (void); extern void ira_finish_allocno_live_ranges (void); /* ira-conflicts.c */ extern void ira_debug_conflicts (bool); extern void ira_build_conflicts (void); /* ira-color.c */ extern int ira_loop_edge_freq (ira_loop_tree_node_t, int, bool); extern void ira_reassign_conflict_allocnos (int); extern void ira_initiate_assign (void); extern void ira_finish_assign (void); extern void ira_color (void); /* ira-emit.c */ extern void ira_emit (bool); /* Return cost of moving value of MODE from register of class FROM to register of class TO. */ static inline int ira_get_register_move_cost (enum machine_mode mode, enum reg_class from, enum reg_class to) { if (ira_register_move_cost[mode] == NULL) ira_init_register_move_cost (mode); return ira_register_move_cost[mode][from][to]; } /* Return cost of moving value of MODE from register of class FROM to register of class TO. Return zero if IN_P is true and FROM is subset of TO or if IN_P is false and FROM is superset of TO. */ static inline int ira_get_may_move_cost (enum machine_mode mode, enum reg_class from, enum reg_class to, bool in_p) { if (ira_register_move_cost[mode] == NULL) ira_init_register_move_cost (mode); return (in_p ? ira_may_move_in_cost[mode][from][to] : ira_may_move_out_cost[mode][from][to]); } /* The iterator for all allocnos. */ typedef struct { /* The number of the current element in IRA_ALLOCNOS. */ int n; } ira_allocno_iterator; /* Initialize the iterator I. */ static inline void ira_allocno_iter_init (ira_allocno_iterator *i) { i->n = 0; } /* Return TRUE if we have more allocnos to visit, in which case *A is set to the allocno to be visited. Otherwise, return FALSE. */ static inline bool ira_allocno_iter_cond (ira_allocno_iterator *i, ira_allocno_t *a) { int n; for (n = i->n; n < ira_allocnos_num; n++) if (ira_allocnos[n] != NULL) { *a = ira_allocnos[n]; i->n = n + 1; return true; } return false; } /* Loop over all allocnos. In each iteration, A is set to the next allocno. ITER is an instance of ira_allocno_iterator used to iterate the allocnos. */ #define FOR_EACH_ALLOCNO(A, ITER) \ for (ira_allocno_iter_init (&(ITER)); \ ira_allocno_iter_cond (&(ITER), &(A));) /* The iterator for copies. */ typedef struct { /* The number of the current element in IRA_COPIES. */ int n; } ira_copy_iterator; /* Initialize the iterator I. */ static inline void ira_copy_iter_init (ira_copy_iterator *i) { i->n = 0; } /* Return TRUE if we have more copies to visit, in which case *CP is set to the copy to be visited. Otherwise, return FALSE. */ static inline bool ira_copy_iter_cond (ira_copy_iterator *i, ira_copy_t *cp) { int n; for (n = i->n; n < ira_copies_num; n++) if (ira_copies[n] != NULL) { *cp = ira_copies[n]; i->n = n + 1; return true; } return false; } /* Loop over all copies. In each iteration, C is set to the next copy. ITER is an instance of ira_copy_iterator used to iterate the copies. */ #define FOR_EACH_COPY(C, ITER) \ for (ira_copy_iter_init (&(ITER)); \ ira_copy_iter_cond (&(ITER), &(C));) /* The iterator for allocno conflicts. */ typedef struct { /* TRUE if the conflicts are represented by vector of allocnos. */ bool allocno_conflict_vec_p; /* The conflict vector or conflict bit vector. */ void *vec; /* The number of the current element in the vector (of type ira_allocno_t or IRA_INT_TYPE). */ unsigned int word_num; /* The bit vector size. It is defined only if ALLOCNO_CONFLICT_VEC_P is FALSE. */ unsigned int size; /* The current bit index of bit vector. It is defined only if ALLOCNO_CONFLICT_VEC_P is FALSE. */ unsigned int bit_num; /* Allocno conflict id corresponding to the 1st bit of the bit vector. It is defined only if ALLOCNO_CONFLICT_VEC_P is FALSE. */ int base_conflict_id; /* The word of bit vector currently visited. It is defined only if ALLOCNO_CONFLICT_VEC_P is FALSE. */ unsigned IRA_INT_TYPE word; } ira_allocno_conflict_iterator; /* Initialize the iterator I with ALLOCNO conflicts. */ static inline void ira_allocno_conflict_iter_init (ira_allocno_conflict_iterator *i, ira_allocno_t allocno) { i->allocno_conflict_vec_p = ALLOCNO_CONFLICT_VEC_P (allocno); i->vec = ALLOCNO_CONFLICT_ALLOCNO_ARRAY (allocno); i->word_num = 0; if (i->allocno_conflict_vec_p) i->size = i->bit_num = i->base_conflict_id = i->word = 0; else { if (ALLOCNO_MIN (allocno) > ALLOCNO_MAX (allocno)) i->size = 0; else i->size = ((ALLOCNO_MAX (allocno) - ALLOCNO_MIN (allocno) + IRA_INT_BITS) / IRA_INT_BITS) * sizeof (IRA_INT_TYPE); i->bit_num = 0; i->base_conflict_id = ALLOCNO_MIN (allocno); i->word = (i->size == 0 ? 0 : ((IRA_INT_TYPE *) i->vec)[0]); } } /* Return TRUE if we have more conflicting allocnos to visit, in which case *A is set to the allocno to be visited. Otherwise, return FALSE. */ static inline bool ira_allocno_conflict_iter_cond (ira_allocno_conflict_iterator *i, ira_allocno_t *a) { ira_allocno_t conflict_allocno; if (i->allocno_conflict_vec_p) { conflict_allocno = ((ira_allocno_t *) i->vec)[i->word_num]; if (conflict_allocno == NULL) return false; *a = conflict_allocno; return true; } else { /* Skip words that are zeros. */ for (; i->word == 0; i->word = ((IRA_INT_TYPE *) i->vec)[i->word_num]) { i->word_num++; /* If we have reached the end, break. */ if (i->word_num * sizeof (IRA_INT_TYPE) >= i->size) return false; i->bit_num = i->word_num * IRA_INT_BITS; } /* Skip bits that are zero. */ for (; (i->word & 1) == 0; i->word >>= 1) i->bit_num++; *a = ira_conflict_id_allocno_map[i->bit_num + i->base_conflict_id]; return true; } } /* Advance to the next conflicting allocno. */ static inline void ira_allocno_conflict_iter_next (ira_allocno_conflict_iterator *i) { if (i->allocno_conflict_vec_p) i->word_num++; else { i->word >>= 1; i->bit_num++; } } /* Loop over all allocnos conflicting with ALLOCNO. In each iteration, A is set to the next conflicting allocno. ITER is an instance of ira_allocno_conflict_iterator used to iterate the conflicts. */ #define FOR_EACH_ALLOCNO_CONFLICT(ALLOCNO, A, ITER) \ for (ira_allocno_conflict_iter_init (&(ITER), (ALLOCNO)); \ ira_allocno_conflict_iter_cond (&(ITER), &(A)); \ ira_allocno_conflict_iter_next (&(ITER))) /* The function returns TRUE if hard registers starting with HARD_REGNO and containing value of MODE are not in set HARD_REGSET. */ static inline bool ira_hard_reg_not_in_set_p (int hard_regno, enum machine_mode mode, HARD_REG_SET hard_regset) { int i; ira_assert (hard_regno >= 0); for (i = hard_regno_nregs[hard_regno][mode] - 1; i >= 0; i--) if (TEST_HARD_REG_BIT (hard_regset, hard_regno + i)) return false; return true; } /* To save memory we use a lazy approach for allocation and initialization of the cost vectors. We do this only when it is really necessary. */ /* Allocate cost vector *VEC for hard registers of COVER_CLASS and initialize the elements by VAL if it is necessary */ static inline void ira_allocate_and_set_costs (int **vec, enum reg_class cover_class, int val) { int i, *reg_costs; int len; if (*vec != NULL) return; *vec = reg_costs = ira_allocate_cost_vector (cover_class); len = ira_class_hard_regs_num[cover_class]; for (i = 0; i < len; i++) reg_costs[i] = val; } /* Allocate cost vector *VEC for hard registers of COVER_CLASS and copy values of vector SRC into the vector if it is necessary */ static inline void ira_allocate_and_copy_costs (int **vec, enum reg_class cover_class, int *src) { int len; if (*vec != NULL || src == NULL) return; *vec = ira_allocate_cost_vector (cover_class); len = ira_class_hard_regs_num[cover_class]; memcpy (*vec, src, sizeof (int) * len); } /* Allocate cost vector *VEC for hard registers of COVER_CLASS and add values of vector SRC into the vector if it is necessary */ static inline void ira_allocate_and_accumulate_costs (int **vec, enum reg_class cover_class, int *src) { int i, len; if (src == NULL) return; len = ira_class_hard_regs_num[cover_class]; if (*vec == NULL) { *vec = ira_allocate_cost_vector (cover_class); memset (*vec, 0, sizeof (int) * len); } for (i = 0; i < len; i++) (*vec)[i] += src[i]; } /* Allocate cost vector *VEC for hard registers of COVER_CLASS and copy values of vector SRC into the vector or initialize it by VAL (if SRC is null). */ static inline void ira_allocate_and_set_or_copy_costs (int **vec, enum reg_class cover_class, int val, int *src) { int i, *reg_costs; int len; if (*vec != NULL) return; *vec = reg_costs = ira_allocate_cost_vector (cover_class); len = ira_class_hard_regs_num[cover_class]; if (src != NULL) memcpy (reg_costs, src, sizeof (int) * len); else { for (i = 0; i < len; i++) reg_costs[i] = val; } }
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