rtlanal.c (find_reg_equal_equiv_note): Do not find REG_EQ* notes on an insn with multiple sets...

	* rtlanal.c (find_reg_equal_equiv_note): Do not find REG_EQ*
	notes on an insn with multiple sets, even if single_set returns
	non-NULL for that insn.

From-SVN: r122177

gcc/ChangeLog

+2007-02-20  Steven Bosscher  <steven@gcc.gnu.org>
+
+	* rtlanal.c (find_reg_equal_equiv_note): Do not find REG_EQ*
+	notes on an insn with multiple sets, even if single_set returns
+	non-NULL for that insn.
+
 2007-02-20  Kaveh R. Ghazi  <ghazi@caip.rutgers.edu>
 
 	* fold-const.c (tree_expr_nonnegative_warnv_p): Handle scalb,

gcc/rtlanal.c

@@ -1676,11 +1676,18 @@ find_reg_equal_equiv_note (rtx insn)
 
   if (!INSN_P (insn))
     return 0;
+
   for (link = REG_NOTES (insn); link; link = XEXP (link, 1))
     if (REG_NOTE_KIND (link) == REG_EQUAL
 	|| REG_NOTE_KIND (link) == REG_EQUIV)
       {
-	if (single_set (insn) == 0)
+	/* FIXME: We should never have REG_EQUAL/REG_EQUIV notes on
+	   insns that have multiple sets.  Checking single_set to
+	   make sure of this is not the proper check, as explained
+	   in the comment in set_unique_reg_note.
+
+	   This should be changed into an assert.  */
+	if (GET_CODE (PATTERN (insn)) == PARALLEL && multiple_sets (insn))
 	  return 0;
 	return link;
       }