source: arduino-1-6-7/trunk/fuentes/arduino-ide-amd64/hardware/tools/avr/lib/gcc/avr/4.9.2/plugin/include/reg-notes.def @ 4837

Last change on this file since 4837 was 4837, checked in by daduve, 3 years ago

Adding new version

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1/* Register note definitions.
2   Copyright (C) 2004-2014 Free Software Foundation, Inc.
3
4This file is part of GCC.
5
6GCC is free software; you can redistribute it and/or modify it under
7the terms of the GNU General Public License as published by the Free
8Software Foundation; either version 3, or (at your option) any later
9version.
10
11GCC is distributed in the hope that it will be useful, but WITHOUT ANY
12WARRANTY; without even the implied warranty of MERCHANTABILITY or
13FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14for more details.
15
16You should have received a copy of the GNU General Public License
17along with GCC; see the file COPYING3.  If not see
18<http://www.gnu.org/licenses/>.  */
19
20/* This file defines all the codes that may appear on individual
21   EXPR_LIST, INSN_LIST and INT_LIST rtxes in the REG_NOTES chain of an insn.
22   The codes are stored in the mode field of the rtx.  Source files
23   define DEF_REG_NOTE appropriately before including this file.  */
24
25/* Shorthand.  */
26#define REG_NOTE(NAME) DEF_REG_NOTE (REG_##NAME)
27
28/* REG_DEP_TRUE is used in scheduler dependencies lists to represent a
29   read-after-write dependency (i.e. a true data dependency).  This is
30   here, not grouped with REG_DEP_ANTI and REG_DEP_OUTPUT, because some
31   passes use a literal 0 for it.  */
32REG_NOTE (DEP_TRUE)
33
34/* The value in REG dies in this insn (i.e., it is not needed past
35   this insn).  If REG is set in this insn, the REG_DEAD note may,
36   but need not, be omitted.  */
37REG_NOTE (DEAD)
38
39/* The REG is autoincremented or autodecremented in this insn.  */
40REG_NOTE (INC)
41
42/* Describes the insn as a whole; it says that the insn sets a
43   register to a constant value or to be equivalent to a memory
44   address.  If the register is spilled to the stack then the constant
45   value should be substituted for it.  The contents of the REG_EQUIV
46   is the constant value or memory address, which may be different
47   from the source of the SET although it has the same value.  A
48   REG_EQUIV note may also appear on an insn which copies a register
49   parameter to a pseudo-register, if there is a memory address which
50   could be used to hold that pseudo-register throughout the function.  */
51REG_NOTE (EQUIV)
52
53/* Like REG_EQUIV except that the destination is only momentarily
54   equal to the specified rtx.  Therefore, it cannot be used for
55   substitution; but it can be used for cse.  */
56REG_NOTE (EQUAL)
57
58/* The register is always nonnegative during the containing loop.
59   This is used in branches so that decrement and branch instructions
60   terminating on zero can be matched.  There must be an insn pattern
61   in the md file named `decrement_and_branch_until_zero' or else this
62   will never be added to any instructions.  */
63REG_NOTE (NONNEG)
64
65/* Identifies a register set in this insn and never used.  */
66REG_NOTE (UNUSED)
67
68/* REG_CC_SETTER and REG_CC_USER link a pair of insns that set and use
69   CC0, respectively.  Normally, these are required to be consecutive
70   insns, but we permit putting a cc0-setting insn in the delay slot
71   of a branch as long as only one copy of the insn exists.  In that
72   case, these notes point from one to the other to allow code
73   generation to determine what any require information and to
74   properly update CC_STATUS.  These notes are INSN_LISTs.  */
75REG_NOTE (CC_SETTER)
76REG_NOTE (CC_USER)
77
78/* Points to a CODE_LABEL.  Used by JUMP_INSNs to say that the CODE_LABEL
79   contained in the REG_LABEL_TARGET note is a possible jump target of
80   this insn.  This note is an INSN_LIST.  */
81REG_NOTE (LABEL_TARGET)
82
83/* Points to a CODE_LABEL.  Used by any insn to say that the CODE_LABEL
84   contained in the REG_LABEL_OPERAND note is used by the insn, but as an
85   operand, not as a jump target (though it may indirectly be a jump
86   target for a later jump insn).  This note is an INSN_LIST.  */
87REG_NOTE (LABEL_OPERAND)
88
89/* REG_DEP_OUTPUT and REG_DEP_ANTI are used in scheduler dependencies lists
90   to represent write-after-write and write-after-read dependencies
91   respectively.  */
92REG_NOTE (DEP_OUTPUT)
93REG_NOTE (DEP_ANTI)
94REG_NOTE (DEP_CONTROL)
95
96/* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs.  It has an
97   integer value (in an INT_LIST).  For jumps, it is the probability
98   that this is a taken branch.  For calls, it is the probability that
99   this call won't return.  */
100REG_NOTE (BR_PROB)
101
102/* Attached to a call insn; indicates that the call is malloc-like and
103   that the pointer returned cannot alias anything else.  */
104REG_NOTE (NOALIAS)
105
106/* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs.  It contains
107   CONCAT of two integer value.  First specifies the branch predictor
108   that added the note, second specifies the predicted hitrate of
109   branch in the same format as REG_BR_PROB note uses.  */
110REG_NOTE (BR_PRED)
111
112/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
113   for DWARF to interpret what they imply.  The attached rtx is used
114   instead of intuition.  */
115REG_NOTE (FRAME_RELATED_EXPR)
116
117/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
118   for FRAME_RELATED_EXPR intuition.  The insn's first pattern must be
119   a SET, and the destination must be the CFA register.  The attached
120   rtx is an expression that defines the CFA.  In the simplest case, the
121   rtx could be just the stack_pointer_rtx; more common would be a PLUS
122   with a base register and a constant offset.  In the most complicated
123   cases, this will result in a DW_CFA_def_cfa_expression with the rtx
124   expression rendered in a dwarf location expression.  */
125REG_NOTE (CFA_DEF_CFA)
126
127/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
128   for FRAME_RELATED_EXPR intuition.  This note adjusts the expression
129   from which the CFA is computed.  The attached rtx defines a new CFA
130   expression, relative to the old CFA expression.  This rtx must be of
131   the form (SET new-cfa-reg (PLUS old-cfa-reg const_int)).  If the note
132   rtx is NULL, we use the first SET of the insn.  */
133REG_NOTE (CFA_ADJUST_CFA)
134
135/* Similar to FRAME_RELATED_EXPR, with the additional information that
136   this is a save to memory, i.e. will result in DW_CFA_offset or the
137   like.  The pattern or the insn should be a simple store relative to
138   the CFA.  */
139REG_NOTE (CFA_OFFSET)
140
141/* Similar to FRAME_RELATED_EXPR, with the additional information that this
142   is a save to a register, i.e. will result in DW_CFA_register.  The insn
143   or the pattern should be simple reg-reg move.  */
144REG_NOTE (CFA_REGISTER)
145
146/* Attached to insns that are RTX_FRAME_RELATED_P, but are too complex
147   for FRAME_RELATED_EXPR intuition.  This is a save to memory, i.e. will
148   result in a DW_CFA_expression.  The pattern or the insn should be a
149   store of a register to an arbitrary (non-validated) memory address.  */
150REG_NOTE (CFA_EXPRESSION)
151
152/* Attached to insns that are RTX_FRAME_RELATED_P, with the information
153   that this is a restore operation, i.e. will result in DW_CFA_restore
154   or the like.  Either the attached rtx, or the destination of the insn's
155   first pattern is the register to be restored.  */
156REG_NOTE (CFA_RESTORE)
157
158/* Attached to insns that are RTX_FRAME_RELATED_P, marks insn that sets
159   vDRAP from DRAP.  If vDRAP is a register, vdrap_reg is initalized
160   to the argument, if it is a MEM, it is ignored.  */
161REG_NOTE (CFA_SET_VDRAP)
162
163/* Attached to insns that are RTX_FRAME_RELATED_P, indicating a window
164   save operation, i.e. will result in a DW_CFA_GNU_window_save.
165   The argument is ignored.  */
166REG_NOTE (CFA_WINDOW_SAVE)
167
168/* Attached to insns that are RTX_FRAME_RELATED_P, marks the insn as
169   requiring that all queued information should be flushed *before* insn,
170   regardless of what is visible in the rtl.  The argument is ignored.
171   This is normally used for a call instruction which is not exposed to
172   the rest of the compiler as a CALL_INSN.  */
173REG_NOTE (CFA_FLUSH_QUEUE)
174
175/* Indicates what exception region an INSN belongs in.  This is used
176   to indicate what region to which a call may throw.  REGION 0
177   indicates that a call cannot throw at all.  REGION -1 indicates
178   that it cannot throw, nor will it execute a non-local goto.  */
179REG_NOTE (EH_REGION)
180
181/* Used by haifa-sched to save NOTE_INSN notes across scheduling.  */
182REG_NOTE (SAVE_NOTE)
183
184/* Indicates that a call does not return.  */
185REG_NOTE (NORETURN)
186
187/* Indicates that an indirect jump is a non-local goto instead of a
188   computed goto.  */
189REG_NOTE (NON_LOCAL_GOTO)
190
191/* Indicates that a jump crosses between hot and cold sections in a
192   (partitioned) assembly or .o file, and therefore should not be
193   reduced to a simpler jump by optimizations.  */
194REG_NOTE (CROSSING_JUMP)
195
196/* This kind of note is generated at each to `setjmp', and similar
197   functions that can return twice.  */
198REG_NOTE (SETJMP)
199
200/* This kind of note is generated at each transactional memory
201   builtin, to indicate we need to generate transaction restart
202   edges for this insn.  */
203REG_NOTE (TM)
204
205/* Indicates the cumulative offset of the stack pointer accounting
206   for pushed arguments.  This will only be generated when
207   ACCUMULATE_OUTGOING_ARGS is false.  */
208REG_NOTE (ARGS_SIZE)
209
210/* Used for communication between IRA and caller-save.c, indicates
211   that the return value of a call can be used to reinitialize a
212   pseudo reg.  */
213REG_NOTE (RETURNED)
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