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Multi-limb arithmetic for runtime (#3743)

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* First working version of all operations.

* New and improved version of everything.

* Minor cleanup.

* Fix build

* Finalize nignum

* Some final works on refactors and tests.

* fix build

* Some review comments

* Bench, better try into and nits

* mutify the API

* rename to big_uint

* unmutify.

* Remove resize

* Apply suggestions from code review

* Update core/sr-primitives/src/sr_arithmetic.rs

Co-Authored-By: thiolliere <gui.thiolliere@gmail.com>

* BEtter proof

* Fix panic doc.

* Bump.
This commit is contained in:
Kian Paimani
2019-10-10 09:52:08 +02:00
committed by GitHub
parent 4da48dd9f5
commit 21fae718c4
5 changed files with 1014 additions and 210 deletions
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substrate/core/phragmen/src/lib.rs
+6 -6
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@@ -34,8 +34,8 @@
#![cfg_attr(not(feature = "std"), no_std)]
use rstd::{prelude::*, collections::btree_map::BTreeMap};
use sr_primitives::{helpers_128bit::multiply_by_rational_best_effort, Perbill, Rational128};
use sr_primitives::traits::{Zero, Convert, Member, SimpleArithmetic, Saturating};
use sr_primitives::{helpers_128bit::multiply_by_rational, Perbill, Rational128};
use sr_primitives::traits::{Zero, Convert, Member, SimpleArithmetic, Saturating, Bounded};
mod mock;
mod tests;
@@ -253,11 +253,11 @@ pub fn elect<AccountId, Balance, FS, C>(
for e in &n.edges {
let c = &mut candidates[e.candidate_index];
if !c.elected && !c.approval_stake.is_zero() {
let temp_n = multiply_by_rational_best_effort(
let temp_n = multiply_by_rational(
n.load.n(),
n.budget,
c.approval_stake,
);
).unwrap_or(Bounded::max_value());
let temp_d = n.load.d();
let temp = Rational128::from(temp_n, temp_d);
c.score = c.score.lazy_saturating_add(temp);
@@ -303,11 +303,11 @@ pub fn elect<AccountId, Balance, FS, C>(
if e.load.d() == n.load.d() {
// return e.load / n.load.
let desired_scale: u128 = Perbill::accuracy().into();
multiply_by_rational_best_effort(
multiply_by_rational(
desired_scale,
e.load.n(),
n.load.n(),
)
).unwrap_or(Bounded::max_value())
} else {
// defensive only. Both edge and nominator loads are built from
// scores, hence MUST have the same denominator.