Gf128.gf128.mask: def of bend-osdev-gf@0.1.1.0
Import: import bend-osdev-gf@0.1.1.0/gf128.bend as Gf128
Lines 81-83 of bend-osdev-gf@0.1.1.0/gf128.bend: https://jend.leeeet.dev/read.txt?path=bend-osdev-gf@0.1.1.0/gf128.bend&start_line=81&end_line=83

import Base

# all ones if the low bit of b is set, else 0
def gf128.mask(b: U32) -> U32:
  U32.sub(0, U32.and(b, 1))

Uses (3):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.and
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub