!sum
# Abs — signed integer absolute value. ZABS is predicated-only: it has no
# unpredicated encoding, so its governing predicate is implicit-all-true and
# its merging qualifier becomes the predicated machine op.
- go: Abs
  asm: "ZABS"
  in:
  - &int
    go: $t
    base: int
  - class: mask # governing predicate
  out:
  - *int