Histogram.count.cols: def of bend-parallel@0.1.0.0
Import: import bend-parallel@0.1.0.0/histogram.bend as Histogram
Lines 293-297 of bend-parallel@0.1.0.0/histogram.bend: https://jend.leeeet.dev/read.txt?path=bend-parallel@0.1.0.0/histogram.bend&start_line=293&end_line=297

import Base

# Pass 2b over the 2^kb columns, 2^min(d, kb) groups: each sums its
# columns over the 2^r groups' last rows.
def count.cols(+r: Nat, +m: Nat, +g: Nat, +k: U32, +kb: Nat, keys: Array<U32>, counts: Array<U32>, table: Array<U32>) -> Array<U32> & Bufs:
  count.fin(keys, cols(g, 0, Nat.sub(kb, g), k, U32.shln((U32.shln(1, m) - 1 : U32), kb), U32.shln(1, Nat.add(m, kb)),
    U32.to_nat((U32.shln(1, r) - 1 : U32)), Array.fork(U32, table), Array.fork(U32, fit.eq(kb, Array.size(U32, counts)))))

Uses (15):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.fork
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Array.size
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.add
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Pair
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shln
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.to_nat
  https://jend.leeeet.dev/definition.txt?path=bend-parallel@0.1.0.0/histogram.bend&name=Bufs
  https://jend.leeeet.dev/definition.txt?path=bend-parallel@0.1.0.0/histogram.bend&name=cols
  https://jend.leeeet.dev/definition.txt?path=bend-parallel@0.1.0.0/histogram.bend&name=count.fin
  https://jend.leeeet.dev/definition.txt?path=bend-parallel@0.1.0.0/histogram.bend&name=fit.eq