gas/config/xtensa-relax.h

   1 /* Table of relaxations for Xtensa assembly.
   2    Copyright 2003 Free Software Foundation, Inc.
   3
   4    This file is part of GAS, the GNU Assembler.
   5
   6    GAS is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2, or (at your option)
   9    any later version.
  10
  11    GAS is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with GAS; see the file COPYING.  If not, write to
  18    the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
  19    MA 02111-1307, USA.  */
  20
  21 #ifndef XTENSA_RELAX_H
  22 #define XTENSA_RELAX_H
  23
  24 #include "xtensa-isa.h"
  25
  26
  27 /* Data structures for the table-driven relaxations for Xtensa processors.
  28    See xtensa-relax.c for details.  */
  29
  30 typedef struct transition_list TransitionList;
  31 typedef struct transition_table TransitionTable;
  32 typedef struct transition_rule TransitionRule;
  33 typedef struct precondition_list PreconditionList;
  34 typedef struct precondition Precondition;
  35
  36 struct transition_table
  37 {
  38   int num_opcodes;
  39   TransitionList **table;       /* Possible transitions for each opcode.  */
  40 };
  41
  42 struct transition_list
  43 {
  44   TransitionRule *rule;
  45   TransitionList *next;
  46 };
  47
  48 struct precondition_list
  49 {
  50   Precondition *precond;
  51   PreconditionList *next;
  52 };
  53
  54
  55 /* Operand types and constraints on operands:  */
  56
  57 typedef enum op_type OpType;
  58 typedef enum cmp_op CmpOp;
  59
  60 enum op_type
  61 {
  62   OP_CONSTANT,
  63   OP_OPERAND,
  64   OP_OPERAND_LOW8,              /* Sign-extended low 8 bits of immed.  */
  65   OP_OPERAND_HI24S,             /* high 24 bits of immed,
  66                                    plus 0x100 if low 8 bits are signed.  */
  67   OP_OPERAND_F32MINUS,          /* 32 - immed.  */
  68   OP_LITERAL,
  69   OP_LABEL
  70 };
  71
  72 enum cmp_op
  73 {
  74   OP_EQUAL,
  75   OP_NOTEQUAL,
  76 };
  77
  78 struct precondition
  79 {
  80   CmpOp cmp;
  81   int op_num;
  82   OpType typ;                   /* CONSTANT: op_data is a constant.
  83                                    OPERAND: operand op_num must equal op_data.
  84                                    Cannot be LITERAL or LABEL.  */
  85   int op_data;
  86 };
  87
  88 typedef struct build_op BuildOp;
  89
  90 struct build_op
  91 {
  92   int op_num;
  93   OpType typ;
  94   unsigned op_data;             /* CONSTANT: op_data is the value to encode.
  95                                    OPERAND: op_data is the field in the
  96                                    source instruction to take the value from
  97                                    and encode in the op_num field here.
  98                                    LITERAL or LABEL: op_data is the ordinal
  99                                    that identifies the appropriate one, i.e.,
 100                                    there can be more than one literal or
 101                                    label in an expansion.  */
 102   BuildOp *next;
 103 };
 104
 105 typedef struct build_instr BuildInstr;
 106 typedef enum instr_type InstrType;
 107
 108 enum instr_type
 109 {
 110   INSTR_INSTR,
 111   INSTR_LITERAL_DEF,
 112   INSTR_LABEL_DEF
 113 };
 114
 115 struct build_instr
 116 {
 117   InstrType typ;
 118   unsigned id;                  /* LITERAL_DEF or LABEL_DEF: an ordinal to
 119                                    identify which one.  */
 120   xtensa_opcode opcode;         /* unused for LITERAL_DEF or LABEL_DEF.  */
 121   BuildOp *ops;
 122   BuildInstr *next;
 123 };
 124
 125 struct transition_rule
 126 {
 127   xtensa_opcode opcode;
 128   PreconditionList *conditions;
 129   BuildInstr *to_instr;
 130 };
 131
 132 extern TransitionTable *xg_build_simplify_table
 133   PARAMS ((void));
 134 extern TransitionTable *xg_build_widen_table
 135   PARAMS ((void));
 136
 137 extern bfd_boolean xg_has_userdef_op_fn
 138   PARAMS ((OpType));
 139 extern long xg_apply_userdef_op_fn
 140   PARAMS ((OpType, long));
 141
 142 #endif /* !XTENSA_RELAX_H */