diff --git a/gcc/recog.c b/gcc/recog.c
index 39a9dda..fa323df 100644
--- a/gcc/recog.c
+++ b/gcc/recog.c
@@ -984,6 +984,11 @@ general_operand (rtx op, enum machine_mode mode)
 	  && MEM_P (sub))
 	return 0;
 
+      /* Similarly, avoid SUBREG (MEM) with side effects (e.g. volatile
+	 mem, PRE_INC address etc).  */
+      if (!reload_completed && MEM_P (sub) && side_effects_p (sub))
+	return 0;
+
       /* FLOAT_MODE subregs can't be paradoxical.  Combine will occasionally
 	 create such rtl, and we must reject it.  */
       if (SCALAR_FLOAT_MODE_P (GET_MODE (op))