diff options
Diffstat (limited to 'gcc/ra.h')
| -rw-r--r-- | gcc/ra.h | 133 |
1 files changed, 133 insertions, 0 deletions
diff --git a/gcc/ra.h b/gcc/ra.h new file mode 100644 index 0000000..52a1cc2 --- /dev/null +++ b/gcc/ra.h @@ -0,0 +1,133 @@ +/* Define per-register tables for data flow info and register allocation. + Copyright (C) 2007 Free Software Foundation, Inc. + +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/>. */ + +#ifndef GCC_RA_H +#define GCC_RA_H + +#include "regs.h" + +struct allocno +{ + int reg; + /* Gives the number of consecutive hard registers needed by that + pseudo reg. */ + int size; + + /* Number of calls crossed by each allocno. */ + int calls_crossed; + + /* Number of calls that might throw crossed by each allocno. */ + int throwing_calls_crossed; + + /* Number of refs to each allocno. */ + int n_refs; + + /* Frequency of uses of each allocno. */ + int freq; + + /* Guess at live length of each allocno. + This is actually the max of the live lengths of the regs. */ + int live_length; + + /* Set of hard regs conflicting with allocno N. */ + + HARD_REG_SET hard_reg_conflicts; + + /* Set of hard regs preferred by allocno N. + This is used to make allocnos go into regs that are copied to or from them, + when possible, to reduce register shuffling. */ + + HARD_REG_SET hard_reg_preferences; + + /* Similar, but just counts register preferences made in simple copy + operations, rather than arithmetic. These are given priority because + we can always eliminate an insn by using these, but using a register + in the above list won't always eliminate an insn. */ + + HARD_REG_SET hard_reg_copy_preferences; + + /* Similar to hard_reg_preferences, but includes bits for subsequent + registers when an allocno is multi-word. The above variable is used for + allocation while this is used to build reg_someone_prefers, below. */ + + HARD_REG_SET hard_reg_full_preferences; + + /* Set of hard registers that some later allocno has a preference for. */ + + HARD_REG_SET regs_someone_prefers; + +#ifdef STACK_REGS + /* Set to true if allocno can't be allocated in the stack register. */ + bool no_stack_reg; +#endif +}; +extern struct allocno *allocno; + +/* In ra-conflict.c */ + +/* Number of pseudo-registers which are candidates for allocation. */ + +extern int max_allocno; + +/* max_allocno by max_allocno array of bits, recording whether two + allocno's conflict (can't go in the same hardware register). + + `conflicts' is symmetric after the call to mirror_conflicts. */ + +extern HOST_WIDE_INT *conflicts; + +/* Number of ints required to hold max_allocno bits. + This is the length of a row in `conflicts'. */ + +extern int allocno_row_words; + +/* Indexed by (pseudo) reg number, gives the allocno, or -1 + for pseudo registers which are not to be allocated. */ + +extern int *reg_allocno; + +extern void global_conflicts (void); + +/* In global.c */ + +/* For any allocno set in ALLOCNO_SET, set ALLOCNO to that allocno, + and execute CODE. */ +#define EXECUTE_IF_SET_IN_ALLOCNO_SET(ALLOCNO_SET, ALLOCNO, CODE) \ +do { \ + int i_; \ + int allocno_; \ + HOST_WIDE_INT *p_ = (ALLOCNO_SET); \ + \ + for (i_ = allocno_row_words - 1, allocno_ = 0; i_ >= 0; \ + i_--, allocno_ += HOST_BITS_PER_WIDE_INT) \ + { \ + unsigned HOST_WIDE_INT word_ = (unsigned HOST_WIDE_INT) *p_++; \ + \ + for ((ALLOCNO) = allocno_; word_; word_ >>= 1, (ALLOCNO)++) \ + { \ + if (word_ & 1) \ + {CODE;} \ + } \ + } \ +} while (0) + +extern void ra_init_live_subregs (bool, sbitmap *, int *, int, rtx reg); + + +#endif /* GCC_RA_H */ |