[dpdk-dev] [PATCH] Implement memcmp using AVX/SSE instructio

[Ravi Kerur]

On Thu, Apr 23, 2015 at 12:24 AM, Pawel Wodkowski <
pawelx.wodkowski at intel.com> wrote:

> On 2015-04-22 17:33, Ravi Kerur wrote:
>
>> +/**
>> + * Compare bytes between two locations. The locations must not overlap.
>> + *
>> + * @note This is implemented as a macro, so it's address should not be
>> taken
>> + * and care is needed as parameter expressions may be evaluated multiple
>> times.
>> + *
>> + * @param src_1
>> + *   Pointer to the first source of the data.
>> + * @param src_2
>> + *   Pointer to the second source of the data.
>> + * @param n
>> + *   Number of bytes to compare.
>> + * @return
>> + *   true if equal otherwise false.
>> + */
>> +static inline bool
>> +rte_memcmp(const void *src_1, const void *src,
>> +               size_t n) __attribute__((always_inline));
>>
> You are exposing this as public API, so I think you should follow
> description bellow or not call this _memcmp_
>
> int memcmp(const void *s1, const void *s2, size_t n);
>
> The memcmp() function returns an integer less than, equal  to,  or
> greater  than
>        zero  if  the  first  n  bytes  of s1 is found, respectively, to be
> less than, to
>        match, or be greater than the first n bytes of s2.
>
>
This can/will be fixed in future version.

Thanks.

> --
> Pawel
>