recog.c (split_insn): Copy the original SET_SRC before using it as a note.

gcc/
	* recog.c (split_insn): Copy the original SET_SRC before using
	it as a note.

From-SVN: r190102

gcc/ChangeLog

 2012-08-02  Richard Sandiford  <rdsandiford@googlemail.com>
 
+	* recog.c (split_insn): Copy the original SET_SRC before using
+	it as a note.
+
+2012-08-02  Richard Sandiford  <rdsandiford@googlemail.com>
+
 	* reorg.c (dbr_schedule): Delete REG_BR_PRED loop.
 
 2012-08-02  Marc Glisse  <marc.glisse@inria.fr>

gcc/recog.c

@@ -2831,7 +2831,8 @@ split_insn (rtx insn)
 	  if (note && CONSTANT_P (XEXP (note, 0)))
 	    set_unique_reg_note (last, REG_EQUAL, XEXP (note, 0));
 	  else if (CONSTANT_P (SET_SRC (insn_set)))
-	    set_unique_reg_note (last, REG_EQUAL, SET_SRC (insn_set));
+	    set_unique_reg_note (last, REG_EQUAL,
+				 copy_rtx (SET_SRC (insn_set)));
 	}
     }