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79c52daf47
C23 adds various <math.h> function families originally defined in TS 18661-4. Add the log2p1 functions (log2(1+x): like log1p, but for base-2 logarithms). This illustrates the intended structure of implementations of all these function families: define them initially with a type-generic template implementation. If someone wishes to add type-specific implementations, it is likely such implementations can be both faster and more accurate than the type-generic one and can then override it for types for which they are implemented (adding benchmarks would be desirable in such cases to demonstrate that a new implementation is indeed faster). The test inputs are copied from those for log1p. Note that these changes make gen-auto-libm-tests depend on MPFR 4.2 (or later). The bulk of the changes are fairly generic for any such new function. (sysdeps/powerpc/nofpu/Makefile only needs changing for those type-generic templates that use fabs.) Tested for x86_64 and x86, and with build-many-glibcs.py.
54 lines
1.8 KiB
C++
54 lines
1.8 KiB
C++
/* Test log2p1.
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Copyright (C) 2024 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include "libm-test-driver.c"
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static const struct test_f_f_data log2p1_test_data[] =
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{
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TEST_f_f (log2p1, -1, minus_infty, DIVIDE_BY_ZERO_EXCEPTION|ERRNO_ERANGE),
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TEST_f_f (log2p1, -2, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
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TEST_f_f (log2p1, -max_value, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM|XFAIL_ROUNDING_IBM128_LIBGCC),
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TEST_f_f (log2p1, minus_infty, qnan_value, INVALID_EXCEPTION|ERRNO_EDOM),
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TEST_f_f (log2p1, plus_infty, plus_infty, ERRNO_UNCHANGED),
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TEST_f_f (log2p1, qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_f_f (log2p1, -qnan_value, qnan_value, NO_INEXACT_EXCEPTION|ERRNO_UNCHANGED),
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TEST_f_f (log2p1, snan_value, qnan_value, INVALID_EXCEPTION),
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TEST_f_f (log2p1, -snan_value, qnan_value, INVALID_EXCEPTION),
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AUTO_TESTS_f_f (log2p1),
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};
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static void
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log2p1_test (void)
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{
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ALL_RM_TEST (log2p1, 0, log2p1_test_data, RUN_TEST_LOOP_f_f, END);
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}
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static void
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do_test (void)
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{
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log2p1_test ();
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}
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/*
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* Local Variables:
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* mode:c
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* End:
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*/
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