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libc-internal.h: add ALIGN helper macros

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Rather than open coding the masks, add helper macros to do the magic.
This makes code easier to read.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger 2013-05-28 18:25:54 -04:00
parent e1f0b2cfa1
commit d605071ebf
2 changed files with 27 additions and 0 deletions
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ChangeLog
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@ -1,3 +1,10 @@
2013-06-24 Mike Frysinger <vapier@gentoo.org>
* include/libc-internal.h (ALIGN_DOWN): New helper macro.
(ALIGN_UP): Likewise.
(PTR_ALIGN_DOWN): Likewise.
(PTR_ALIGN_UP): Likewise.
2013-06-24 Ryan S. Arnold <rsa@linux.vnet.ibm.com>
* sysdeps/powerpc/dl-procinfo.c (_dl_powerpc_platforms): Add "power8"

20
include/libc-internal.h
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@ -50,4 +50,24 @@ extern void __init_misc (int, char **, char **);
/* Cast an integer or a pointer VAL to integer with proper type. */
# define cast_to_integer(val) ((__integer_if_pointer_type (val)) (val))
/* Align a value by rounding down to closest size.
e.g. Using size of 4096, we get this behavior:
{4095, 4096, 4097} = {0, 4096, 4096}. */
#define ALIGN_DOWN(base, size) ((base) & -((__typeof__ (base)) (size)))
/* Align a value by rounding up to closest size.
e.g. Using size of 4096, we get this behavior:
{4095, 4096, 4097} = {4096, 4096, 8192}.
Note: The size argument has side effects (expanded multiple times). */
#define ALIGN_UP(base, size) ALIGN_DOWN ((base) + (size) - 1, (size))
/* Same as ALIGN_DOWN(), but automatically casts when base is a pointer. */
#define PTR_ALIGN_DOWN(base, size) \
((__typeof__ (base)) ALIGN_DOWN ((uintptr_t) (base), (size)))
/* Same as ALIGN_UP(), but automatically casts when base is a pointer. */
#define PTR_ALIGN_UP(base, size) \
((__typeof__ (base)) ALIGN_UP ((uintptr_t) (base), (size)))
#endif /* _LIBC_INTERNAL */