forked from auracaster/openocd
edf2c82cf6
Zero is not a power of two.
All functions that use IS_PWR_OF_2 were checked and the edge case
of IS_PWR_OF_2(0) does not occur anywhere at the moment. Therefore
the fix is safe.
Change-Id: I84d9f9c64c9a7df452ca6e99c2ee4169ccb2b0be
Signed-off-by: Jan Matyas <jan.matyas@codasip.com>
Fixes: 9544cd653d ("helper: add align.h")
Reviewed-on: https://review.openocd.org/c/openocd/+/8511
Reviewed-by: Antonio Borneo <borneo.antonio@gmail.com>
Tested-by: jenkins
31 lines
915 B
C
31 lines
915 B
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* The content of this file is mainly copied/inspired from Linux kernel
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* code in include/linux/align.h and include/uapi/linux/const.h
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*
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* Macro name 'ALIGN' conflicts with macOS/BSD file param.h
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*/
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#ifndef OPENOCD_HELPER_ALIGN_H
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#define OPENOCD_HELPER_ALIGN_H
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#define ALIGN_MASK(x, mask) \
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({ \
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typeof(mask) _mask = (mask); \
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((x) + _mask) & ~_mask; \
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})
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/* @a is a power of 2 value */
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#define ALIGN_UP(x, a) ALIGN_MASK(x, (typeof(x))(a) - 1)
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#define ALIGN_DOWN(x, a) ((x) & ~((typeof(x))(a) - 1))
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#define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0)
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#define IS_PWR_OF_2(x) \
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({ \
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typeof(x) _x = (x); \
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_x != 0 && (_x & (_x - 1)) == 0; \
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})
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#endif /* OPENOCD_HELPER_ALIGN_H */
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