143 lines
3.4 KiB
C
143 lines
3.4 KiB
C
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/* Table of relaxations for Xtensa assembly.
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Copyright 2003 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 2, 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, 59 Temple Place - Suite 330, Boston,
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MA 02111-1307, 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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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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/* 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_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: op_data is the ordinal
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that identifies the appropriate one, i.e.,
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there can be more than one literal or
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label in an expansion. */
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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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unsigned id; /* LITERAL_DEF or LABEL_DEF: an ordinal to
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identify which one. */
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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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BuildInstr *to_instr;
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};
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extern TransitionTable *xg_build_simplify_table
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PARAMS ((void));
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extern TransitionTable *xg_build_widen_table
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PARAMS ((void));
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extern bfd_boolean xg_has_userdef_op_fn
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PARAMS ((OpType));
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extern long xg_apply_userdef_op_fn
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PARAMS ((OpType, long));
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#endif /* !XTENSA_RELAX_H */
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