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eal: add macro to align value to the nearest multiple

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Add macro to align value to the nearest multiple of the given value,
resultant value might be greater than or less than the first parameter
whichever difference is the lowest.
Update unit test to include the new macro.

Signed-off-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
This commit is contained in:
Pavan Nikhilesh 2019-03-16 19:01:50 +00:00 committed by Thomas Monjalon
parent 55878866eb
commit f56e551485
2 changed files with 16 additions and 0 deletions
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4
app/test/test_common.c
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@ -199,6 +199,10 @@ test_align(void)
val = RTE_ALIGN_MUL_FLOOR(i, p);
if (val % p != 0 || val > i)
FAIL_ALIGN("RTE_ALIGN_MUL_FLOOR", i, p);
val = RTE_ALIGN_MUL_NEAR(i, p);
if (val % p != 0 || ((val != RTE_ALIGN_MUL_CEIL(i, p))
& (val != RTE_ALIGN_MUL_FLOOR(i, p))))
FAIL_ALIGN("RTE_ALIGN_MUL_NEAR", i, p);
}
}

12
lib/librte_eal/common/include/rte_common.h
View File

@ -248,6 +248,18 @@ static void __attribute__((destructor(RTE_PRIO(prio)), used)) func(void)
#define RTE_ALIGN_MUL_FLOOR(v, mul) \
((v / ((typeof(v))(mul))) * (typeof(v))(mul))
/**
* Macro to align value to the nearest multiple of the given value.
* The resultant value might be greater than or less than the first parameter
* whichever difference is the lowest.
*/
#define RTE_ALIGN_MUL_NEAR(v, mul) \
({ \
typeof(v) ceil = RTE_ALIGN_MUL_CEIL(v, mul); \
typeof(v) floor = RTE_ALIGN_MUL_FLOOR(v, mul); \
(ceil - v) > (v - floor) ? floor : ceil; \
})
/**
* Checks if a pointer is aligned to a given power-of-two value
*