W64.minv: def of bend-collections-laws-crypto@1.0.0.0
Import: import bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend as W64
Lines 583-586 of bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend: https://jend.leeeet.dev/read.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend&start_line=583&end_line=586

import Base
import bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend as W

# -1 / m mod 2^64 for odd m (m is its own inverse mod 8; five Newton steps
# reach 96 >= 64 bits)
def minv(+m: W.U64) -> W.U64:
  sub(W.U64{0, 0}, inv_step(m, inv_step(m, inv_step(m, inv_step(m, inv_step(m, m))))))

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/u64.bend&name=U64
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend&name=inv_step
  https://jend.leeeet.dev/definition.txt?path=bend-collections-laws-crypto@1.0.0.0/src/math/w64.bend&name=sub