vendor/crypto-bigint/src/nlimbs.rs

   1 /// Calculate the number of limbs required to represent the given number of bits.
   2 // TODO(tarcieri): replace with `generic_const_exprs` (rust-lang/rust#76560) when stable
   3 #[macro_export]
   4 macro_rules! nlimbs {
   5     ($bits:expr) => {
   6         $bits / $crate::Limb::BITS
   7     };
   8 }
   9
  10 #[cfg(test)]
  11 mod tests {
  12     #[cfg(target_pointer_width = "32")]
  13     #[test]
  14     fn nlimbs_for_bits_macro() {
  15         assert_eq!(nlimbs!(64), 2);
  16         assert_eq!(nlimbs!(128), 4);
  17         assert_eq!(nlimbs!(192), 6);
  18         assert_eq!(nlimbs!(256), 8);
  19     }
  20
  21     #[cfg(target_pointer_width = "64")]
  22     #[test]
  23     fn nlimbs_for_bits_macro() {
  24         assert_eq!(nlimbs!(64), 1);
  25         assert_eq!(nlimbs!(128), 2);
  26         assert_eq!(nlimbs!(192), 3);
  27         assert_eq!(nlimbs!(256), 4);
  28     }
  29 }