diff --git a/gcc/config/aarch64/aarch64.md b/gcc/config/aarch64/aarch64.md
index e6086a9..3bfe6e6 100644
--- a/gcc/config/aarch64/aarch64.md
+++ b/gcc/config/aarch64/aarch64.md
@@ -2311,7 +2311,7 @@
        (ashift:GPI (ANY_EXTEND:GPI
                     (match_operand:ALLX 1 "register_operand" "r"))
                    (match_operand 2 "const_int_operand" "n")))]
-  ""
+  "<ALLX:sizen> <= (<GPI:sizen> - UINTVAL (operands[2]))"
   "<su>bfiz\\t%<GPI:w>0, %<GPI:w>1, %2, #<ALLX:sizen>"
   [(set_attr "v8type" "bfm")
    (set_attr "mode" "<GPI:MODE>")]