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host-utils: introduce uabs64() 

Introduce uabs64(), a function that returns the absolute value of
a 64-bit int as an unsigned value. This avoids the undefined behavior
for common abs implementations, where abs of the most negative value is
undefined.

Signed-off-by: Luis Pires <luis.pires@eldorado.org.br>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Eduardo Habkost <ehabkost@redhat.com>
Message-Id: <20210910112624.72748-4-luis.pires@eldorado.org.br>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Luis Pires 2021-09-10 08:26:05 -03:00 committed by David Gibson
parent 4ff2a971f4
commit d03bba0bfb
1 changed files with 8 additions and 0 deletions
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8
include/qemu/host-utils.h
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@ -357,6 +357,14 @@ static inline uint64_t revbit64(uint64_t x)
#endif #endif
} }
/**
* Return the absolute value of a 64-bit integer as an unsigned 64-bit value
*/
static inline uint64_t uabs64(int64_t v)
{
return v < 0 ? -v : v;
}
/** /**
* sadd32_overflow - addition with overflow indication * sadd32_overflow - addition with overflow indication
* @x, @y: addends * @x, @y: addends