1 files changed, 29 insertions, 0 deletions
diff --git a/vendor/crypto-bigint/src/nlimbs.rs b/vendor/crypto-bigint/src/nlimbs.rs
new file mode 100644
index 0000000..c5166e7
--- /dev/null
+++ b/vendor/crypto-bigint/src/nlimbs.rs
@@ -0,0 +1,29 @@
+/// Calculate the number of limbs required to represent the given number of bits.
+// TODO(tarcieri): replace with `generic_const_exprs` (rust-lang/rust#76560) when stable
+#[macro_export]
+macro_rules! nlimbs {
+    ($bits:expr) => {
+        $bits / $crate::Limb::BITS
+    };
+}
+
+#[cfg(test)]
+mod tests {
+    #[cfg(target_pointer_width = "32")]
+    #[test]
+    fn nlimbs_for_bits_macro() {
+        assert_eq!(nlimbs!(64), 2);
+        assert_eq!(nlimbs!(128), 4);
+        assert_eq!(nlimbs!(192), 6);
+        assert_eq!(nlimbs!(256), 8);
+    }
+
+    #[cfg(target_pointer_width = "64")]
+    #[test]
+    fn nlimbs_for_bits_macro() {
+        assert_eq!(nlimbs!(64), 1);
+        assert_eq!(nlimbs!(128), 2);
+        assert_eq!(nlimbs!(192), 3);
+        assert_eq!(nlimbs!(256), 4);
+    }
+}