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[/] [openrisc/] [trunk/] [gnu-src/] [binutils-2.18.50/] [gas/] [config/] [xtensa-relax.h] - Blame information for rev 438

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/* Table of relaxations for Xtensa assembly.
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   Copyright 2003, 2004, 2007 Free Software Foundation, Inc.
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   This file is part of GAS, the GNU Assembler.
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   GAS is free software; you can redistribute it and/or modify
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   it under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   GAS is distributed in the hope that it will be useful,
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   but WITHOUT ANY WARRANTY; without even the implied warranty of
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
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   along with GAS; see the file COPYING.  If not, write to
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   the Free Software Foundation, 51 Franklin Street - Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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#ifndef XTENSA_RELAX_H
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#define XTENSA_RELAX_H
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#include "xtensa-isa.h"
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/* Data structures for the table-driven relaxations for Xtensa processors.
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   See xtensa-relax.c for details.  */
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typedef struct transition_list TransitionList;
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typedef struct transition_table TransitionTable;
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typedef struct transition_rule TransitionRule;
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typedef struct precondition_list PreconditionList;
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typedef struct precondition Precondition;
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typedef struct req_or_option_list ReqOrOptionList;
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typedef struct req_or_option_list ReqOrOption;
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typedef struct req_option_list ReqOptionList;
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typedef struct req_option_list ReqOption;
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struct transition_table
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{
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  int num_opcodes;
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  TransitionList **table;       /* Possible transitions for each opcode.  */
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};
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struct transition_list
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{
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  TransitionRule *rule;
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  TransitionList *next;
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};
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struct precondition_list
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{
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  Precondition *precond;
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  PreconditionList *next;
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};
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/* The required options for a rule are represented with a two-level
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   structure, with leaf expressions combined by logical ORs at the
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   lower level, and the results then combined by logical ANDs at the
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   top level.  The AND terms are linked in a list, and each one can
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   contain a reference to a list of OR terms.  The leaf expressions,
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   i.e., the OR options, can be negated by setting the is_true field
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   to FALSE.  There are two classes of leaf expressions: (1) those
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   that are properties of the Xtensa configuration and can be
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   evaluated once when building the tables, and (2) those that depend
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   of the state of directives or other settings that may vary during
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   the assembly.  The following expressions may be used in group (1):
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   IsaUse*:     Xtensa configuration settings.
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   realnop:     TRUE if the instruction set includes a NOP instruction.
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   There are currently no expressions in group (2), but they are still
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   supported since there is a good chance they'll be needed again for
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   something.  */
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struct req_option_list
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{
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  ReqOrOptionList *or_option_terms;
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  ReqOptionList *next;
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};
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struct req_or_option_list
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{
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  char *option_name;
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  bfd_boolean is_true;
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  ReqOrOptionList *next;
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};
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/* Operand types and constraints on operands:  */
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typedef enum op_type OpType;
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typedef enum cmp_op CmpOp;
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enum op_type
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{
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  OP_CONSTANT,
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  OP_OPERAND,
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  OP_OPERAND_LOW8,              /* Sign-extended low 8 bits of immed.  */
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  OP_OPERAND_HI24S,             /* High 24 bits of immed,
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                                   plus 0x100 if low 8 bits are signed.  */
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  OP_OPERAND_F32MINUS,          /* 32 - immed.  */
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  OP_OPERAND_LOW16U,            /* Low 16 bits of immed.  */
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  OP_OPERAND_HI16U,             /* High 16 bits of immed.  */
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  OP_LITERAL,
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  OP_LABEL
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};
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enum cmp_op
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{
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  OP_EQUAL,
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  OP_NOTEQUAL,
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};
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struct precondition
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{
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  CmpOp cmp;
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  int op_num;
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  OpType typ;                   /* CONSTANT: op_data is a constant.
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                                   OPERAND: operand op_num must equal op_data.
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                                   Cannot be LITERAL or LABEL.  */
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  int op_data;
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};
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typedef struct build_op BuildOp;
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struct build_op
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{
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  int op_num;
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  OpType typ;
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  unsigned op_data;             /* CONSTANT: op_data is the value to encode.
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                                   OPERAND: op_data is the field in the
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                                   source instruction to take the value from
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                                   and encode in the op_num field here.
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                                   LITERAL or LABEL: unused.  */
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  BuildOp *next;
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};
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typedef struct build_instr BuildInstr;
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typedef enum instr_type InstrType;
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enum instr_type
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{
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  INSTR_INSTR,
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  INSTR_LITERAL_DEF,
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  INSTR_LABEL_DEF
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};
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struct build_instr
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{
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  InstrType typ;
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  xtensa_opcode opcode;         /* Unused for LITERAL_DEF or LABEL_DEF.  */
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  BuildOp *ops;
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  BuildInstr *next;
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};
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struct transition_rule
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{
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  xtensa_opcode opcode;
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  PreconditionList *conditions;
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  ReqOptionList *options;
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  BuildInstr *to_instr;
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};
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typedef int (*transition_cmp_fn) (const TransitionRule *,
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                                  const TransitionRule *);
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extern TransitionTable *xg_build_simplify_table (transition_cmp_fn);
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extern TransitionTable *xg_build_widen_table (transition_cmp_fn);
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extern bfd_boolean xg_has_userdef_op_fn (OpType);
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extern long xg_apply_userdef_op_fn (OpType, long);
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#endif /* !XTENSA_RELAX_H */

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