T_LIBM_CHECK_PLUS_ZERO
T_LIBM_CHECK_PLUS_ZERO(0, acos, 1.0);
T_LIBM_CHECK_PLUS_ZERO(0, acosf, 1.0);
T_LIBM_CHECK_PLUS_ZERO(0, atan, +0.0);
T_LIBM_CHECK_PLUS_ZERO(0, atanf, +0.0);
T_LIBM_CHECK_PLUS_ZERO(0, exp2, T_LIBM_MINUS_INF);
T_LIBM_CHECK_PLUS_ZERO(0, exp2f, T_LIBM_MINUS_INF);