/* Communication between the Integrated Register Allocator (IRA) and the rest of the compiler. Copyright (C) 2006-2014 Free Software Foundation, Inc. Contributed by Vladimir Makarov . 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 . */ /* True when we use LRA instead of reload pass for the current function. */ extern bool ira_use_lra_p; /* True if we have allocno conflicts. It is false for non-optimized mode or when the conflict table is too big. */ extern bool ira_conflicts_p; struct target_ira { /* Map: hard register number -> allocno class it belongs to. If the corresponding class is NO_REGS, the hard register is not available for allocation. */ enum reg_class x_ira_hard_regno_allocno_class[FIRST_PSEUDO_REGISTER]; /* Number of allocno classes. Allocno classes are register classes which can be used for allocations of allocnos. */ int x_ira_allocno_classes_num; /* The array containing allocno classes. Only first IRA_ALLOCNO_CLASSES_NUM elements are used for this. */ enum reg_class x_ira_allocno_classes[N_REG_CLASSES]; /* Map of all register classes to corresponding allocno classes containing the given class. If given class is not a subset of an allocno class, we translate it into the cheapest allocno class. */ enum reg_class x_ira_allocno_class_translate[N_REG_CLASSES]; /* Number of pressure classes. Pressure classes are register classes for which we calculate register pressure. */ int x_ira_pressure_classes_num; /* The array containing pressure classes. Only first IRA_PRESSURE_CLASSES_NUM elements are used for this. */ enum reg_class x_ira_pressure_classes[N_REG_CLASSES]; /* Map of all register classes to corresponding pressure classes containing the given class. If given class is not a subset of an pressure class, we translate it into the cheapest pressure class. */ enum reg_class x_ira_pressure_class_translate[N_REG_CLASSES]; /* Bigest pressure register class containing stack registers. NO_REGS if there are no stack registers. */ enum reg_class x_ira_stack_reg_pressure_class; /* Maps: register class x machine mode -> maximal/minimal number of hard registers of given class needed to store value of given mode. */ unsigned char x_ira_reg_class_max_nregs[N_REG_CLASSES][MAX_MACHINE_MODE]; unsigned char x_ira_reg_class_min_nregs[N_REG_CLASSES][MAX_MACHINE_MODE]; /* Array analogous to target hook TARGET_MEMORY_MOVE_COST. */ short x_ira_memory_move_cost[MAX_MACHINE_MODE][N_REG_CLASSES][2]; /* Array of number of hard registers of given class which are available for the allocation. The order is defined by the allocation order. */ short x_ira_class_hard_regs[N_REG_CLASSES][FIRST_PSEUDO_REGISTER]; /* The number of elements of the above array for given register class. */ int x_ira_class_hard_regs_num[N_REG_CLASSES]; /* Register class subset relation: TRUE if the first class is a subset of the second one considering only hard registers available for the allocation. */ int x_ira_class_subset_p[N_REG_CLASSES][N_REG_CLASSES]; /* The biggest 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. */ enum reg_class x_ira_reg_class_subset[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. */ bool x_ira_reg_classes_intersect_p[N_REG_CLASSES][N_REG_CLASSES]; /* If class CL has a single allocatable register of mode M, index [CL][M] gives the number of that register, otherwise it is -1. */ short x_ira_class_singleton[N_REG_CLASSES][MAX_MACHINE_MODE]; /* Function specific hard registers can not be used for the register allocation. */ HARD_REG_SET x_ira_no_alloc_regs; }; extern struct target_ira default_target_ira; #if SWITCHABLE_TARGET extern struct target_ira *this_target_ira; #else #define this_target_ira (&default_target_ira) #endif #define ira_hard_regno_allocno_class \ (this_target_ira->x_ira_hard_regno_allocno_class) #define ira_allocno_classes_num \ (this_target_ira->x_ira_allocno_classes_num) #define ira_allocno_classes \ (this_target_ira->x_ira_allocno_classes) #define ira_allocno_class_translate \ (this_target_ira->x_ira_allocno_class_translate) #define ira_pressure_classes_num \ (this_target_ira->x_ira_pressure_classes_num) #define ira_pressure_classes \ (this_target_ira->x_ira_pressure_classes) #define ira_pressure_class_translate \ (this_target_ira->x_ira_pressure_class_translate) #define ira_stack_reg_pressure_class \ (this_target_ira->x_ira_stack_reg_pressure_class) #define ira_reg_class_max_nregs \ (this_target_ira->x_ira_reg_class_max_nregs) #define ira_reg_class_min_nregs \ (this_target_ira->x_ira_reg_class_min_nregs) #define ira_memory_move_cost \ (this_target_ira->x_ira_memory_move_cost) #define ira_class_hard_regs \ (this_target_ira->x_ira_class_hard_regs) #define ira_class_hard_regs_num \ (this_target_ira->x_ira_class_hard_regs_num) #define ira_class_subset_p \ (this_target_ira->x_ira_class_subset_p) #define ira_reg_class_subset \ (this_target_ira->x_ira_reg_class_subset) #define ira_reg_classes_intersect_p \ (this_target_ira->x_ira_reg_classes_intersect_p) #define ira_class_singleton \ (this_target_ira->x_ira_class_singleton) #define ira_no_alloc_regs \ (this_target_ira->x_ira_no_alloc_regs) /* Major structure describing equivalence info for a pseudo. */ struct ira_reg_equiv_s { /* True if we can use this equivalence. */ bool defined_p; /* True if the usage of the equivalence is profitable. */ bool profitable_p; /* Equiv. memory, constant, invariant, and initializing insns of given pseudo-register or NULL_RTX. */ rtx memory; rtx constant; rtx invariant; /* Always NULL_RTX if defined_p is false. */ rtx init_insns; }; /* The length of the following array. */ extern int ira_reg_equiv_len; /* Info about equiv. info for each register. */ extern struct ira_reg_equiv_s *ira_reg_equiv; extern void ira_init_once (void); extern void ira_init (void); extern void ira_finish_once (void); extern void ira_setup_eliminable_regset (void); extern rtx ira_eliminate_regs (rtx, enum machine_mode); extern void ira_set_pseudo_classes (bool, FILE *); extern void ira_implicitly_set_insn_hard_regs (HARD_REG_SET *); extern void ira_expand_reg_equiv (void); extern void ira_update_equiv_info_by_shuffle_insn (int, int, rtx_insn *); extern void ira_sort_regnos_for_alter_reg (int *, int, unsigned int *); extern void ira_mark_allocation_change (int); extern void ira_mark_memory_move_deletion (int, int); extern bool ira_reassign_pseudos (int *, int, HARD_REG_SET, HARD_REG_SET *, HARD_REG_SET *, bitmap); extern rtx ira_reuse_stack_slot (int, unsigned int, unsigned int); extern void ira_mark_new_stack_slot (rtx, int, unsigned int); extern bool ira_better_spill_reload_regno_p (int *, int *, rtx, rtx, rtx); extern bool ira_bad_reload_regno (int, rtx, rtx); extern void ira_adjust_equiv_reg_cost (unsigned, int);