def add

bend-collections@1.0.0.0 · src/crypto/blake/blake2b/lane.bend:5

import Base
import bend-collections@1.0.0.0/src/crypto/blake/blake2b/types.bend as T

5# 64-bit addition modulo 2^64: the low halves add, their carry-out enters the high half.
6def add(a: T.Lane, b: T.Lane) -> T.Lane:
7  match a b:
8    case T.W{+al,ah} T.W{bl,bh}:
9      +lo = U32.add(al,bl)
10      T.W{lo,U32.add(U32.add(ah,bh),Bool.to_u32(U32.is_lt(lo,al)))}