caller-save.c (insert_one_insn): Take into account REG_INC notes for the…

caller-save.c (insert_one_insn): Take into account REG_INC notes for the liveness computation of the new insn.

	* caller-save.c (insert_one_insn): Take into account REG_INC notes
	for the liveness computation of the new insn.

From-SVN: r142099

gcc/ChangeLog

+2008-11-21  Eric Botcazou  <ebotcazou@adacore.com>
+
+	* caller-save.c (insert_one_insn): Take into account REG_INC notes
+	for the liveness computation of the new insn.
+
 2008-11-21  DJ Delorie  <dj@redhat.com>
 
 	* config/stormy16/stormy16.md (movqi_internal, movhi_internal):

gcc/caller-save.c

@@ -1216,10 +1216,12 @@ insert_one_insn (struct insn_chain *chain, int before_p, int code, rtx pat)
       /* ??? It would be nice if we could exclude the already / still saved
 	 registers from the live sets.  */
       COPY_REG_SET (&new_chain->live_throughout, &chain->live_throughout);
-      /* Registers that die in CHAIN->INSN still live in the new insn.  */
+      /* Registers that die in CHAIN->INSN still live in the new insn.
+	 Likewise for those which are autoincremented or autodecremented.  */
       for (link = REG_NOTES (chain->insn); link; link = XEXP (link, 1))
 	{
-	  if (REG_NOTE_KIND (link) == REG_DEAD)
+	  enum reg_note kind = REG_NOTE_KIND (link);
+	  if (kind == REG_DEAD || kind == REG_INC)
 	    {
 	      rtx reg = XEXP (link, 0);
 	      int regno, i;