diff --git a/gcc/config/m68k/m68k.c b/gcc/config/m68k/m68k.c
index ed263933048e1..c8cbb6f91ef2a 100644
--- a/gcc/config/m68k/m68k.c
+++ b/gcc/config/m68k/m68k.c
@@ -2112,7 +2112,7 @@ m68k_illegitimate_symbolic_constant_p (rtx x)
 	  && !offset_within_block_p (base, INTVAL (offset)))
 	return true;
     }
-  return m68k_tls_reference_p (x, false);
+  return m68k_tls_reference_p (x, false) || !amigaos_legitimate_src(x);
 }
 
 /* Implement TARGET_CANNOT_FORCE_CONST_MEM.  */
diff --git a/gcc/loop-doloop.c b/gcc/loop-doloop.c
index 4135248a37541..100ed3a4f97ea 100644
--- a/gcc/loop-doloop.c
+++ b/gcc/loop-doloop.c
@@ -302,6 +302,23 @@ doloop_valid_p (struct loop *loop, struct niter_desc *desc)
       goto cleanup;
     }
 
+#ifdef TARGET_AMIGAOS
+  if (desc->noloop_assumptions)
+    {
+      rtx cmp = XEXP (desc->noloop_assumptions, 0);
+      if (COMPARISON_P (cmp))
+	{
+	  rtx b = XEXP (cmp, 0);
+	  extern bool amigaos_legitimate_src (rtx);
+	  if (!amigaos_legitimate_src (b))
+	    {
+	      result = false;
+	      goto cleanup;
+	    }
+	}
+    }
+#endif
+
   for (i = 0; i < loop->num_nodes; i++)
     {
       bb = body[i];