diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 7dd1dfa6a18..8b5b58c89a9 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+1998-02-11  Mark Mitchell  <mmitchell@usa.net>
+
+	* config/i386/i386.c (reg_mentioned_in_mem): Don't abort when
+	falling through default case in switch.
+	(i386_aligned_p): Likewise.
+
 Wed Feb 11 12:59:56 1998  Lee Iverson  <leei@Canada.AI.SRI.COM>
 
 	* mips/mips.h (mips_abi_string): Correct typo in comment.
diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index ae370e10511..796c3f58813 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -495,7 +495,7 @@ i386_aligned_p (op)
       return i386_aligned_reg_p (REGNO (op));
     
     default:
-      abort ();
+      break;
     }
 
   return 0;
@@ -4828,7 +4828,7 @@ reg_mentioned_in_mem (reg, rtl)
     case SUBREG:
       return 0;
     default:
-      abort ();
+      break;
     }
 
   if (code == MEM && reg_mentioned_p (reg, rtl))