Implement <len> operator for expressions

The <len> operator returns the width of an integer in bits, using the
same calculation as for packing an integer into a bit field.

1 files changed, 1 insertions, 5 deletions

diff --git a/src/stages/bytecode.rs b/src/stages/bytecode.rs
index e4464a1..1d27b28 100644
--- a/src/stages/bytecode.rs
+++ b/src/stages/bytecode.rs
@@ -162,11 +162,7 @@ impl BytecodeParser {
                     *value
                 }
             };
-            let value_width = match field_value.cmp(&0) {
-                std::cmp::Ordering::Less => (-field_value).ilog2() + 2,
-                std::cmp::Ordering::Equal => 0,
-                std::cmp::Ordering::Greater => field_value.ilog2() + 1,
-            };
+            let value_width = width(field_value);
             if field.width < value_width {
                 let error = BytecodeError::ValueTooWide(field.width, value_width);
                 self.errors.push(Tracked::from(error, field_source.clone()));