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glibc/math/libm-test-rootn.inc
Joseph Myers 06caf53adf Implement C23 rootn. 
C23 adds various <math.h> function families originally defined in TS
18661-4.  Add the rootn functions, which compute the Yth root of X for
integer Y (with a domain error if Y is 0, even if X is a NaN).  The
integer exponent has type long long int in C23; it was intmax_t in TS
18661-4, and as with other interfaces changed after their initial
appearance in the TS, I don't think we need to support the original
version of the interface.

As with pown and compoundn, I strongly encourage searching for worst
cases for ulps error for these implementations (necessarily
non-exhaustively, given the size of the input space).  I also expect a
custom implementation for a given format could be much faster as well
as more accurate, although the implementation is simpler than those
for pown and compoundn.

This completes adding to glibc those TS 18661-4 functions (ignoring
DFP) that are included in C23.  See
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118592 regarding the C23
mathematical functions (not just the TS 18661-4 ones) missing built-in
functions in GCC, where such functions might usefully be added.

Tested for x86_64 and x86, and with build-many-glibcs.py.
2025-05-14 10:51:46 +00:00

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/* Test rootn.
Copyright (C) 2025 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include "libm-test-driver.c"
static const struct test_fL_f_data rootn_test_data[] =
{
TEST_fL_f (rootn, qnan_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -qnan_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, snan_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -snan_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, plus_infty, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, plus_zero, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_zero, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, min_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, min_subnorm_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, max_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, 0, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, 2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, 4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, 0x7ffffffffffffffeLL, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, 2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, 4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, 0x7ffffffffffffffeLL, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, 2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, 4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, 0x7ffffffffffffffeLL, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, 2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, 4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, 0x7ffffffffffffffeLL, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, 2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, 4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, 0x7ffffffffffffffeLL, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, -4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_subnorm_value, LLONG_MIN, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, -4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -min_value, LLONG_MIN, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, -4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -1.0, LLONG_MIN, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, -4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, -max_value, LLONG_MIN, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, -4, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, minus_infty, LLONG_MIN, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
TEST_fL_f (rootn, qnan_value, 1, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, 1, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, -1, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, -1, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, 2, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, 2, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, -2, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, -2, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, 3, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, 3, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, -3, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, -3, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, LLONG_MAX, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, LLONG_MAX, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, qnan_value, LLONG_MIN, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, -qnan_value, LLONG_MIN, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
TEST_fL_f (rootn, snan_value, 1, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, 1, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, -1, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, -1, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, 2, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, 2, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, -2, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, -2, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, 3, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, 3, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, -3, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, -3, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, LLONG_MAX, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, LLONG_MAX, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, snan_value, LLONG_MIN, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, -snan_value, LLONG_MIN, qnan_value, INVALID_EXCEPTION),
TEST_fL_f (rootn, plus_zero, -1, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, -1, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_zero, -2, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, -2, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_zero, -3, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, -3, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_zero, -4, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, -4, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_zero, -5, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, -5, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_zero, LLONG_MIN, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, minus_zero, LLONG_MIN, plus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
TEST_fL_f (rootn, plus_infty, 1, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, 1, minus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, 2, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, 3, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, 3, minus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, 4, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, 5, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, 5, minus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, LLONG_MAX, plus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, LLONG_MAX, minus_infty, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -1, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, -1, minus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -2, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -3, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, -3, minus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -4, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -5, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, -5, minus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, -0x7fffffffffffffffLL, plus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, minus_infty, -0x7fffffffffffffffLL, minus_zero, ERRNO_UNCHANGED),
TEST_fL_f (rootn, plus_infty, LLONG_MIN, plus_zero, ERRNO_UNCHANGED),
AUTO_TESTS_fL_f (rootn),
};
static void
rootn_test (void)
{
ALL_RM_TEST (rootn, 0, rootn_test_data, RUN_TEST_LOOP_fL_f, END);
}
static void
do_test (void)
{
rootn_test ();
}
/*
* Local Variables:
* mode:c
* End:
*/
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