fieldSub(f[start+1], t) f[start+1] = fieldAdd(f[start+1], t) t = fieldMontgomeryMul(zeta, f[start+6]) f[start+6] = fieldSub(f[start+2], t) f[start+2] = fieldAdd(f[start+2], t) t = fieldMontgomeryMul(zeta, f[start+7]) f[start+7] = fieldSub(f[start+3], t) f[start+3] = fieldAdd(f[start+3], t) } for start := 0; start < 256; start += 4 { m++ zeta := zetas[m] t := fieldMontgomeryMul(zeta, f[start+2]) f[start+2] = fieldSub(f[start], t) f[start] = fieldAdd(f[start], t) t = fieldMontgomeryMul(zeta, f[start+3]) f[start+3]...

		}
	default:
		field.ValueOf = func(ctx context.Context, v reflect.Value) (interface{}, bool) {
			v = reflect.Indirect(v)
			for _, fieldIdx := range field.StructField.Index {
				if fieldIdx >= 0 {
					v = v.Field(fieldIdx)
				} else {
					v = v.Field(-fieldIdx - 1)

					if !v.IsNil() {
						v = v.Elem()
					} else {
						return nil, true
					}
				}
			}