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ea18d5a4c2
Add the C23 memalignment function (query the alignment of a pointer) to glibc. Given how simple this operation is, it would make sense for compilers to inline calls to this function, but I'm treating that as a compiler matter (compilers should add it as a built-in function) rather than adding an inline version to glibc headers (although such an inline version would be reasonable as well). I've filed https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122117 for this feature in GCC. Tested for x86_64 and x86.
44 lines
1.6 KiB
C
44 lines
1.6 KiB
C
/* Test memalignment.
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Copyright (C) 2025 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 <stdlib.h>
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#include <array_length.h>
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#include <support/check.h>
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static int
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do_test (void)
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{
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void *null = NULL;
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TEST_COMPARE (memalignment (NULL), 0);
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TEST_COMPARE (memalignment (null), 0);
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char ca[256];
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array_foreach (p, ca)
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TEST_VERIFY (memalignment (p) >= 1);
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TEST_VERIFY (memalignment (&ca[0]) == 1 || memalignment (&ca[1]) == 1);
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TEST_VERIFY (memalignment (&ca[0]) == 2 || memalignment (&ca[1]) == 2
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|| memalignment (&ca[2]) == 2 || memalignment (&ca[3]) == 2);
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long long int lla[256];
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array_foreach (p, lla)
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TEST_VERIFY (memalignment (p) >= _Alignof (long long int));
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TEST_VERIFY (memalignment (&lla[0]) <= sizeof (long long int)
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|| memalignment (&lla[1]) <= sizeof (long long int));
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return 0;
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}
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#include <support/test-driver.c>
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