/* 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 LOG_LINKS 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_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
substitution; but it can be used for cse. */
REG_NOTE (EQUAL)
-/* This insn copies the return-value of a library call out of the hard
- reg for return values. This note is actually an INSN_LIST and it
- points to the first insn involved in setting up arguments for the
- call. flow.c uses this to delete the entire library call when its
- result is dead. */
-REG_NOTE (RETVAL)
-
-/* The inverse of REG_RETVAL: it goes on the first insn of the library
- call and points at the one that has the REG_RETVAL. This note is
- also an INSN_LIST. */
-REG_NOTE (LIBCALL)
-
/* The register is always nonnegative during the containing loop.
This is used in branches so that decrement and branch instructions
terminating on zero can be matched. There must be an insn pattern
will never be added to any instructions. */
REG_NOTE (NONNEG)
-/* There is no conflict *after this insn* between the register in the
- note and the destination of this insn. */
-REG_NOTE (NO_CONFLICT)
-
/* Identifies a register set in this insn and never used. */
REG_NOTE (UNUSED)
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. */
-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)
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