diff -uprN a/gcc/lra.c b/gcc/lra.c
--- a/gcc/lra.c	2020-12-14 15:26:36.331633230 +0800
+++ b/gcc/lra.c	2020-12-15 18:56:33.699633230 +0800
@@ -507,6 +507,26 @@ lra_emit_move (rtx x, rtx y)
 	 data.	*/
       if (old != max_reg_num ())
 	expand_reg_data (old);
+      while (insn != NULL)
+	{
+	  if (GET_CODE (PATTERN (insn)) == SET
+	      && GET_CODE (SET_SRC (PATTERN (insn))) == LO_SUM
+	      && GET_CODE (SET_DEST (PATTERN (insn))) == REG
+	      && strcmp (insn_data[recog_memoized (insn)].name,
+			 "add_losym_di") == 0)
+	    {
+	      rtx add_losym_dest = SET_DEST (PATTERN (insn));
+	      for (int i = (int) max_reg_num () - 1; i >= old; i--)
+		{
+		  if (regno_reg_rtx[i] == add_losym_dest)
+		    {
+		      setup_reg_classes (i, GENERAL_REGS,
+					 NO_REGS, GENERAL_REGS);
+		    }
+		}
+	    }
+	  insn = PREV_INSN (insn);
+	}
       return;
     }
   lra_emit_add (x, XEXP (y, 0), XEXP (y, 1));