rtl.texi (RTX_FRAME_RELATED_P): Add documentation.

a
Thu Mar 25 14:04:54 EST 1999  Andrew MacLeod  <amacleod@cygnus.com>
	* rtl.texi (RTX_FRAME_RELATED_P): Add documentation.
	* rtl.h (struct rtx_def): Update comment for frame_related field.
	(set_unique_reg_note): Declare prototype.
	* dwarf2out.c (dwarf2out_frame_debug_expr): Split out from
	'dwarf2out_frame_debug' to handle only expressions, and process
	component parts of a PARALLEL expression.
	(dwarf2out_frame_debug): Process insns only, and call
	new function 'dwarf2out_frame_debug_expr' for patterns.
	* emit-rtl.c (set_unique_reg_note): New function to add a reg note,
	but if there is an existingone, deletes it first.
	* expmed.c (expand_mult, expand_divmod): Use set_unique_reg_note.
	* optabs.c (add_equal_note, expand_binop): Use set_unique_reg_note.
	(emit_no_conflict_block, emit_libcall_block): Use set_unique_reg_note.
	(expand_fix):  Use set_unique_reg_note.

From-SVN: r25978

gcc/emit-rtl.c

@@ -3149,6 +3149,24 @@ force_next_line_note ()
 {
   last_linenum = -1;
 }
+
+/* Place a note of KIND on insn INSN with DATUM as the datum. If a
+   note of this type already exists, remove it first. */
+
+void 
+set_unique_reg_note (insn, kind, datum)
+     rtx insn;
+     enum reg_note kind;
+     rtx datum;
+{
+  rtx note = find_reg_note (insn, kind, NULL_RTX);
+
+  /* First remove the note if there already is one.  */
+  if (note) 
+    remove_note (insn, note);
+
+  REG_NOTES (insn) = gen_rtx_EXPR_LIST (kind, datum, REG_NOTES (insn));
+}
 
 /* Return an indication of which type of insn should have X as a body.
    The value is CODE_LABEL, INSN, CALL_INSN or JUMP_INSN.  */