Myers.get_block_cell_value: def of bend-edit-distance@0.2.2.0
Import: import bend-edit-distance@0.2.2.0/src/Myers.bend as Myers
Lines 133-142 of bend-edit-distance@0.2.2.0/src/Myers.bend: https://jend.leeeet.dev/read.txt?path=bend-edit-distance@0.2.2.0/src/Myers.bend&start_line=133&end_line=142

import Base

# getBlockCellValues(block)[W], without constructing the other 31 cells.
# Walking up a row subtracts its positive vertical difference and adds its
# negative difference. W is always in 0..31, never a whole extra block.
def get_block_cell_value(padding: Nat, +pv: U32, +mv: U32, score: U32) -> U32:
  match padding:
    case 0n:
      score
    case 1n+p:
      get_block_cell_value(p, U32.shl(pv), U32.shl(mv),
        U32.add(U32.sub(score, U32.shrn(pv, 31n)), U32.shrn(mv, 31n)))

Uses (6):
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=Nat
  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.shl
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.shrn
  https://jend.leeeet.dev/definition.txt?path=Base/base.bend&name=U32.sub