primitive-types: add U128 full_mul (#546)

* primitive-types: add U128 full_mul * primitive-types: update the changelog * Apply suggestions from code review Co-authored-by: David <dvdplm@gmail.com> Co-authored-by: David <dvdplm@gmail.com>
paritytech · May 24, 2021 · 0ac86ef · 0ac86ef
1 parent 0867e48
commit 0ac86ef
Show file tree

Hide file tree

Showing 2 changed files with 14 additions and 2 deletions.
diff --git a/primitive-types/CHANGELOG.md b/primitive-types/CHANGELOG.md
@@ -5,6 +5,9 @@ The format is based on [Keep a Changelog].
 [Keep a Changelog]: http://keepachangelog.com/en/1.0.0/
 
 ## [Unreleased]
+- Added `U128::full_mul` method. [#546](https://github.com/paritytech/parity-common/pull/546)
+### Breaking
+- Updated `scale-info` to 0.6. [#519](https://github.com/paritytech/parity-common/pull/519)
 
 ## [0.9.0] - 2021-01-27
 ### Breaking

diff --git a/primitive-types/src/lib.rs b/primitive-types/src/lib.rs
@@ -125,9 +125,18 @@ mod rlp {
 
 impl_fixed_hash_conversions!(H256, H160);
 
+impl U128 {
+	/// Multiplies two 128-bit integers to produce full 256-bit integer.
+	/// Overflow is not possible.
+	#[inline(always)]
+	pub fn full_mul(self, other: U128) -> U256 {
+		U256(uint_full_mul_reg!(U128, 2, self, other))
+	}
+}
+
 impl U256 {
-	/// Multiplies two 256-bit integers to produce full 512-bit integer
-	/// No overflow possible
+	/// Multiplies two 256-bit integers to produce full 512-bit integer.
+	/// Overflow is not possible.
 	#[inline(always)]
 	pub fn full_mul(self, other: U256) -> U512 {
 		U512(uint_full_mul_reg!(U256, 4, self, other))