Blake2b.gather: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend as Blake2b
Lines 237-243 of bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&start_line=237&end_line=243

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

# Reads the block's 32 words base+0 .. base+31 from the array, then compresses.
def gather(n: Nat, +base: U32, +next: U32, +last: Bool, +remain: Nat, t: T.Counter, h: T.Chain, acc: List<&2,U32>, pair: Array<U32> & U32) -> Array<U32> & T.Chain:
  match n pair:
    case 0n Tuple{a,w}:
      (a,compress(h,lanes(prepare(last,List.reverse(&2,U32,w <> acc),remain)),t,last))
    case 1n+p Tuple{a,w}:
      gather(p,base,U32.inc(next),last,remain,t,h,w <> acc,Array.get(U32,a,U32.add(base,next)))

Uses (16):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.get
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Bool
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=List.reverse
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Sigma
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.inc
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&name=compress
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&name=lanes
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/spec/crypto/blake/blake2b.bend&name=prepare
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/blake/blake2b/types.bend&name=Chain
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/crypto/blake/blake2b/types.bend&name=Counter