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44829b3ddb
No bug. This commit adds support for __memcmpeq() as a new ABI for all targets. In this commit __memcmpeq() is implemented only as an alias to the corresponding targets memcmp() implementation. __memcmpeq() is added as a new symbol starting with GLIBC_2.35 and defined in string.h with comments explaining its behavior. Basic tests that it is callable and works where added in string/tester.c As discussed in the proposal "Add new ABI '__memcmpeq()' to libc" __memcmpeq() is essentially a reserved namespace for bcmp(). The means is shares the same specifications as memcmp() except the return value for non-equal byte sequences is any non-zero value. This is less strict than memcmp()'s return value specification and can be better optimized when a boolean return is all that is needed. __memcmpeq() is meant to only be called by compilers if they can prove that the return value of a memcmp() call is only used for its boolean value. All tests in string/tester.c passed. As well build succeeds on x86_64-linux-gnu target.
38 lines
1.4 KiB
C
38 lines
1.4 KiB
C
/* Copyright (C) 2013-2021 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 <string.h>
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#define MEMCMP __memcmp_ppc
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#undef weak_alias
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#define weak_alias(name, aliasname) \
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extern __typeof (__memcmp_ppc) aliasname \
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__attribute__ ((weak, alias ("__memcmp_ppc")));
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#undef strong_alias
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#define strong_alias(name, aliasname) \
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extern __typeof (__memcmp_ppc) aliasname \
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__attribute__ ((alias ("__memcmp_ppc")));
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#if IS_IN (libc) && defined(SHARED)
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# undef libc_hidden_builtin_def
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# define libc_hidden_builtin_def(name) \
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__hidden_ver1(__memcmp_ppc, __GI_memcmp, __memcmp_ppc);
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#endif
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extern __typeof (memcmp) __memcmp_ppc attribute_hidden;
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#include <string/memcmp.c>
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