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      1 /* $NetBSD: t_libm.h,v 1.7 2018/11/07 03:59:36 riastradh Exp $ */
      2 
      3 /*
      4  * Check result of fn(arg) is correct within the bounds.
      5  * Should be ok to do the checks using 'double' for 'float' functions.
      6  * On i386 float and double values are returned on the x87 stack and might
      7  * be out of range for the function - so save and print as 'long double'.
      8  * (otherwise you can get 'inf != inf' reported!)
      9  */
     10 #define T_LIBM_CHECK(subtest, fn, arg, expect_, epsilon_) do { \
     11 	long double epsilon = epsilon_; \
     12 	long double expect = expect_; \
     13 	long double r = fn(arg); \
     14 	long double e = fabsl((r - expect)/expect); \
     15 	if (!(r == expect || e <= epsilon)) \
     16 		atf_tc_fail_nonfatal( \
     17 		    "subtest %u: " #fn "(%g) is %Lg (%.14La) " \
     18 		    "not %Lg (%.13La), error %Lg (%.6La) > %Lg", \
     19 		    subtest, arg, r, r, expect, expect, e, e, epsilon); \
     20     } while (0)
     21 
     22 /* Check that the result of fn(arg) is NaN */
     23 #ifndef __vax__
     24 #define T_LIBM_CHECK_NAN(subtest, fn, arg) do { \
     25 	double r = fn(arg); \
     26 	if (!isnan(r)) \
     27 		atf_tc_fail_nonfatal("subtest %u: " #fn "(%g) is %g not NaN", \
     28 		    subtest, arg, r); \
     29     } while (0)
     30 #else
     31 /* vax doesn't support NaN */
     32 #define T_LIBM_CHECK_NAN(subtest, fn, arg) (void)(arg)
     33 #endif
     34 
     35 /* Check that the result of fn(arg) is +0.0 */
     36 #define T_LIBM_CHECK_PLUS_ZERO(subtest, fn, arg) do { \
     37 	double r = fn(arg); \
     38 	if (fabs(r) > 0.0 || signbit(r) != 0) \
     39 		atf_tc_fail_nonfatal("subtest %u: " #fn "(%g) is %g not +0.0", \
     40 		    subtest, arg, r); \
     41     } while (0)
     42 
     43 /* Check that the result of fn(arg) is -0.0 */
     44 #define T_LIBM_CHECK_MINUS_ZERO(subtest, fn, arg) do { \
     45 	double r = fn(arg); \
     46 	if (fabs(r) > 0.0 || signbit(r) == 0) \
     47 		atf_tc_fail_nonfatal("subtest %u: " #fn "(%g) is %g not -0.0", \
     48 		    subtest, arg, r); \
     49     } while (0)
     50 
     51 /* Some useful constants (for test vectors) */
     52 #ifndef __vax__	/* no NAN nor +/- INF on vax */
     53 #define T_LIBM_NAN	(0.0 / 0.0)
     54 #define T_LIBM_PLUS_INF	(+1.0 / 0.0)
     55 #define T_LIBM_MINUS_INF (-1.0 / 0.0)
     56 #endif
     57 
     58 /* One line definition of a simple test */
     59 #define ATF_LIBM_TEST(name, description) \
     60 ATF_TC(name); \
     61 ATF_TC_HEAD(name, tc) { atf_tc_set_md_var(tc, "descr", description); } \
     62 ATF_TC_BODY(name, tc)
     63