[rustc.git] / vendor / crypto-bigint / src / nlimbs.rs

/// 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);
    }
}
Commit	Line	Data
0a29b90c FG	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) => {
49aad941	6	$bits / $crate::Limb::BITS
0a29b90c FG	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	}