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This commit is contained in:
Daniel Lubarov 2022-08-19 10:35:02 -07:00
parent cbfc13c33f
commit 831a671872
1 changed files with 2 additions and 2 deletions
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4
field/src/goldilocks_extensions.rs
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@ -112,14 +112,14 @@ impl Mul for QuinticExtension<GoldilocksField> {
* result coefficient is necessary.
*/
/// Return a, b such that a + b*2^128 = 3*x with a < 2^128 and b < 2^32.
/// Return `a`, `b` such that `a + b*2^128 = 3*(x + y*2^128)` with `a < 2^128` and `b < 2^32`.
#[inline(always)]
fn u160_times_3(x: u128, y: u32) -> (u128, u32) {
let (s, cy) = x.overflowing_add(x << 1);
(s, 3 * y + (x >> 127) as u32 + cy as u32)
}
/// Return a, b such that a + b*2^128 = 7*x with a < 2^128 and b < 2^32.
/// Return `a`, `b` such that `a + b*2^128 = 7*(x + y*2^128)` with `a < 2^128` and `b < 2^32`.
#[inline(always)]
fn u160_times_7(x: u128, y: u32) -> (u128, u32) {
let (d, br) = (x << 3).overflowing_sub(x);