Don't make something with an autoinc an equivalencing insn (PR69752).

	PR rtl-optimization/69752
	* ira.c (update_equiv_regs): When looking for more than a single SET,
	also take other side effects into account.

From-SVN: r233423

gcc/ChangeLog

+2016-02-15  Bernd Schmidt  <bschmidt@redhat.com>
+
+	PR rtl-optimization/69752
+	* ira.c (update_equiv_regs): When looking for more than a single SET,
+	also take other side effects into account.
+
 2016-02-15  Marcin Kościelnicki  <koriakin@0x04.net>
 
 	* config/s390/s390.c (s390_function_profiler): Add a new sequence

gcc/ira.c

@@ -3392,7 +3392,8 @@ update_equiv_regs (void)
 
 	  /* If this insn contains more (or less) than a single SET,
 	     only mark all destinations as having no known equivalence.  */
-	  if (set == NULL_RTX)
+	  if (set == NULL_RTX
+	      || side_effects_p (SET_SRC (set)))
 	    {
 	      note_stores (PATTERN (insn), no_equiv, NULL);
 	      continue;