hacky monomorphic bits-string-parser for now

1 files changed, 10 insertions, 0 deletions

diff --git a/src/sail_lib.ml b/src/sail_lib.ml
index b4c5a8aa..415fc9fd 100644
--- a/src/sail_lib.ml
+++ b/src/sail_lib.ml
@@ -644,3 +644,13 @@ let spaces_matches_prefix s =
   | 0 -> ZNone ()
   | n -> ZSome ((), Big_int.of_int n)
 
+
+let hex_bits_12_matches_prefix s =
+  match maybe_int_of_prefix s with
+  | ZNone () -> ZNone ()
+  | ZSome (n, len) ->
+     let n = Big_int.to_int n in
+     if 0 <= n && n < 4096 then
+       ZSome ((bits_of_int 2048 n, len))
+     else
+       ZNone ()