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eal: add macros to align value to multiple

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Add macros to align given value to the multiple of the supplied
integer.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@caviumnetworks.com>
This commit is contained in:
Pavan Nikhilesh 2018-03-20 18:54:34 +05:30 committed by Thomas Monjalon
parent 2f35377892
commit 5120203d75
2 changed files with 28 additions and 0 deletions
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16
lib/librte_eal/common/include/rte_common.h
View File

@ -190,6 +190,22 @@ static void __attribute__((constructor(prio), used)) func(void)
*/
#define RTE_ALIGN(val, align) RTE_ALIGN_CEIL(val, align)
/**
* Macro to align a value to the multiple of given value. The resultant
* value will be of the same type as the first parameter and will be no lower
* than the first parameter.
*/
#define RTE_ALIGN_MUL_CEIL(v, mul) \
(((v + (typeof(v))(mul) - 1) / ((typeof(v))(mul))) * (typeof(v))(mul))
/**
* Macro to align a value to the multiple of given value. The resultant
* value will be of the same type as the first parameter and will be no higher
* than the first parameter.
*/
#define RTE_ALIGN_MUL_FLOOR(v, mul) \
((v / ((typeof(v))(mul))) * (typeof(v))(mul))
/**
* Checks if a pointer is aligned to a given power-of-two value
*

12
test/test/test_common.c
View File

@ -128,6 +128,18 @@ test_align(void)
FAIL("rte_is_aligned");
}
}
for (p = 1; p <= MAX_NUM / 2; p++) {
for (i = 1; i <= MAX_NUM / 2; i++) {
val = RTE_ALIGN_MUL_CEIL(i, p);
if (val % p != 0 || val < i)
FAIL_ALIGN("RTE_ALIGN_MUL_CEIL", i, p);
val = RTE_ALIGN_MUL_FLOOR(i, p);
if (val % p != 0 || val > i)
FAIL_ALIGN("RTE_ALIGN_MUL_FLOOR", i, p);
}
}
return 0;
}