binutils-gdb/gas/config/xtensa-relax.h
2003-04-01 15:50:31 +00:00

143 lines
3.4 KiB
C

/* Table of relaxations for Xtensa assembly.
Copyright 2003 Free Software Foundation, Inc.
This file is part of GAS, the GNU Assembler.
GAS 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 2, or (at your option)
any later version.
GAS 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 GAS; see the file COPYING. If not, write to
the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
MA 02111-1307, USA. */
#ifndef XTENSA_RELAX_H
#define XTENSA_RELAX_H
#include "xtensa-isa.h"
/* Data structures for the table-driven relaxations for Xtensa processors.
See xtensa-relax.c for details. */
typedef struct transition_list TransitionList;
typedef struct transition_table TransitionTable;
typedef struct transition_rule TransitionRule;
typedef struct precondition_list PreconditionList;
typedef struct precondition Precondition;
struct transition_table
{
int num_opcodes;
TransitionList **table; /* Possible transitions for each opcode. */
};
struct transition_list
{
TransitionRule *rule;
TransitionList *next;
};
struct precondition_list
{
Precondition *precond;
PreconditionList *next;
};
/* Operand types and constraints on operands: */
typedef enum op_type OpType;
typedef enum cmp_op CmpOp;
enum op_type
{
OP_CONSTANT,
OP_OPERAND,
OP_OPERAND_LOW8, /* Sign-extended low 8 bits of immed. */
OP_OPERAND_HI24S, /* high 24 bits of immed,
plus 0x100 if low 8 bits are signed. */
OP_OPERAND_F32MINUS, /* 32 - immed. */
OP_LITERAL,
OP_LABEL
};
enum cmp_op
{
OP_EQUAL,
OP_NOTEQUAL,
};
struct precondition
{
CmpOp cmp;
int op_num;
OpType typ; /* CONSTANT: op_data is a constant.
OPERAND: operand op_num must equal op_data.
Cannot be LITERAL or LABEL. */
int op_data;
};
typedef struct build_op BuildOp;
struct build_op
{
int op_num;
OpType typ;
unsigned op_data; /* CONSTANT: op_data is the value to encode.
OPERAND: op_data is the field in the
source instruction to take the value from
and encode in the op_num field here.
LITERAL or LABEL: op_data is the ordinal
that identifies the appropriate one, i.e.,
there can be more than one literal or
label in an expansion. */
BuildOp *next;
};
typedef struct build_instr BuildInstr;
typedef enum instr_type InstrType;
enum instr_type
{
INSTR_INSTR,
INSTR_LITERAL_DEF,
INSTR_LABEL_DEF
};
struct build_instr
{
InstrType typ;
unsigned id; /* LITERAL_DEF or LABEL_DEF: an ordinal to
identify which one. */
xtensa_opcode opcode; /* unused for LITERAL_DEF or LABEL_DEF. */
BuildOp *ops;
BuildInstr *next;
};
struct transition_rule
{
xtensa_opcode opcode;
PreconditionList *conditions;
BuildInstr *to_instr;
};
extern TransitionTable *xg_build_simplify_table
PARAMS ((void));
extern TransitionTable *xg_build_widen_table
PARAMS ((void));
extern bfd_boolean xg_has_userdef_op_fn
PARAMS ((OpType));
extern long xg_apply_userdef_op_fn
PARAMS ((OpType, long));
#endif /* !XTENSA_RELAX_H */