Blame sysdeps/generic/malloc-alignment.h

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/* Define MALLOC_ALIGNMENT for malloc.  Generic version.
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   Copyright (C) 2017-2018 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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   <http://www.gnu.org/licenses/>.  */
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#ifndef _GENERIC_MALLOC_ALIGNMENT_H
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#define _GENERIC_MALLOC_ALIGNMENT_H
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/* MALLOC_ALIGNMENT is the minimum alignment for malloc'ed chunks.  It
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   must be a power of two at least 2 * SIZE_SZ, even on machines for
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   which smaller alignments would suffice. It may be defined as larger
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   than this though. Note however that code and data structures are
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   optimized for the case of 8-byte alignment.  */
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#define MALLOC_ALIGNMENT (2 * SIZE_SZ < __alignof__ (long double) \
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			  ? __alignof__ (long double) : 2 * SIZE_SZ)
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#endif /* !defined(_GENERIC_MALLOC_ALIGNMENT_H) */