v2.AuxInt = int64ToAuxInt(-1)
		v2.AddArg(x)
		v1.AddArg2(v2, x)
		v0.AddArg(v1)
		v.AddArg(v0)
		return true
	}
	// match: (Ctz32 x)
	// result: (CNTTZW (MOVWZreg x))
	for {
		x := v_0
		v.reset(OpPPC64CNTTZW)
		v0 := b.NewValue0(v.Pos, OpPPC64MOVWZreg, typ.Int64)
		v0.AddArg(x)
		v.AddArg(v0)
		return true
	}
}

			// Make new structure.
			new := s.newValue0(ssa.StructMakeOp(t.NumFields()), t)

			// Add fields as args.
			for i := 0; i < nf; i++ {
				if i == idx {
					new.AddArg(right)
				} else {
					new.AddArg(s.newValue1I(ssa.OpStructSelect, t.FieldType(i), int64(i), old))
				}
			}

			// Recursively assign the new value we've made to the base of the dot op.
			s.assign(left.X, new, false, 0)