re PR rtl-optimization/77714 (Wrong code generation for gcc.c-torture/execute/pr51447.c)

2016-09-27  Bernd Edlinger  <bernd.edlinger@hotmail.de>

        PR rlt-optimization/77714
        * lra-eliminations.c (eliminate_regs_in_insn): Avoid alias on
        REG_EQUAL note.

From-SVN: r240518

gcc/ChangeLog

+2016-09-27  Bernd Edlinger  <bernd.edlinger@hotmail.de>
+
+	PR rlt-optimization/77714
+	* lra-eliminations.c (eliminate_regs_in_insn): Avoid alias on
+	REG_EQUAL note.
+
 2016-09-27  Kugan Vivekanandarajah  <kuganv@linaro.org>
 
 	PR ipa/77677

gcc/lra-eliminations.c

@@ -981,7 +981,7 @@ eliminate_regs_in_insn (rtx_insn *insn, bool replace_p, bool first_p,
 		      }
 		    lra_update_insn_recog_data (insn);
 		    /* Add offset note for future updates.  */
-		    add_reg_note (insn, REG_EQUAL, src);
+		    add_reg_note (insn, REG_EQUAL, copy_rtx (src));
 		    return;
 		  }
 	      }