/* Register note definitions.
- Copyright (C) 2004 Free Software Foundation, Inc.
+ Copyright (C) 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
This file is part of GCC.
GCC 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
+Software Foundation; either version 3, or (at your option) any later
version.
GCC is distributed in the hope that it will be useful, but WITHOUT ANY
for more details.
You should have received a copy of the GNU General Public License
-along with GCC; see the file COPYING. If not, write to the Free
-Software Foundation, 59 Temple Place - Suite 330, Boston, MA
-02111-1307, USA. */
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
/* This file defines all the codes that may appear on individual
EXPR_LIST rtxes in the REG_NOTES chain of an insn. The codes are
/* Shorthand. */
#define REG_NOTE(NAME) DEF_REG_NOTE (REG_##NAME)
+/* REG_DEP_TRUE is used in scheduler dependencies lists to represent a
+ read-after-write dependency (i.e. a true data dependency). This is
+ here, not grouped with REG_DEP_ANTI and REG_DEP_OUTPUT, because some
+ passes use a literal 0 for it. */
+REG_NOTE (DEP_TRUE)
+
/* The value in REG dies in this insn (i.e., it is not needed past
this insn). If REG is set in this insn, the REG_DEAD note may,
but need not, be omitted. */
REG_NOTE (CC_SETTER)
REG_NOTE (CC_USER)
-/* Points to a CODE_LABEL. Used by non-JUMP_INSNs to say that the
- CODE_LABEL contained in the REG_LABEL note is used by the insn.
- This note is an INSN_LIST. */
-REG_NOTE (LABEL)
+/* Points to a CODE_LABEL. Used by JUMP_INSNs to say that the CODE_LABEL
+ contained in the REG_LABEL_TARGET note is a possible jump target of
+ this insn. This note is an INSN_LIST. */
+REG_NOTE (LABEL_TARGET)
-/* REG_DEP_ANTI and REG_DEP_OUTPUT are used in LOG_LINKS to represent
- write-after-read and write-after-write dependencies respectively.
- Data dependencies, which are the only type of LOG_LINK created by
- flow, are represented by a 0 reg note kind. */
-REG_NOTE (DEP_ANTI)
+/* Points to a CODE_LABEL. Used by any insn to say that the CODE_LABEL
+ contained in the REG_LABEL_OPERAND note is used by the insn, but as an
+ operand, not as a jump target (though it may indirectly be a jump
+ target for a later jump insn). This note is an INSN_LIST. */
+REG_NOTE (LABEL_OPERAND)
+
+/* REG_DEP_OUTPUT and REG_DEP_ANTI are used in scheduler dependencies lists
+ to represent write-after-write and write-after-read dependencies
+ respectively. */
REG_NOTE (DEP_OUTPUT)
+REG_NOTE (DEP_ANTI)
/* REG_BR_PROB is attached to JUMP_INSNs and CALL_INSNs. It has an
integer value. For jumps, it is the probability that this is a
that the pointer returned cannot alias anything else. */
REG_NOTE (NOALIAS)
-/* Used to optimize rtl generated by dynamic stack allocations for
- targets where SETJMP_VIA_SAVE_AREA is true. */
-REG_NOTE (SAVE_AREA)
-
/* REG_BR_PRED is attached to JUMP_INSNs and CALL_INSNSs. It contains
CONCAT of two integer value. First specifies the branch predictor
that added the note, second specifies the predicted hitrate of
/* Used by haifa-sched to save NOTE_INSN notes across scheduling. */
REG_NOTE (SAVE_NOTE)
-/* Indicates that this insn (which is part of the prologue) computes a
- value which might not be used later, and if so it's OK to delete
- the insn. Normally, deleting any insn in the prologue is an error.
- At present the parameter is unused and set to (const_int 0). */
-REG_NOTE (MAYBE_DEAD)
-
/* Indicates that a call does not return. */
REG_NOTE (NORETURN)
functions that can return twice. */
REG_NOTE (SETJMP)
-/* Indicate calls that always returns. */
-REG_NOTE (ALWAYS_RETURN)
+/* This kind of note identifies what libcall id an instruction is part of. */
+REG_NOTE (LIBCALL_ID)
+
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