Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)

Em qui., 11 de ago. de 2022 às 08:48, Alvaro Herrera <
alvherre(at)alvh(dot)no-ip(dot)org> escreveu:

> On 2022-Aug-11, Ranier Vilela wrote:
>
> > According to:
> > https://interrupt.memfault.com/blog/c-struct-padding-initialization
>
> Did you actually read it?
>
Yes, today.

>
>
> https://interrupt.memfault.com/blog/c-struct-padding-initialization#structure-zero-initialization
>
> : This looks great! However, it’s not obvious (from looking at those
> snippets)
> : what the value loaded into the padding region will be.
> :
> : The unfortunate answer is: it depends
> :
> : The C11 standard, chapter §6.2.6.1/6 says this:
> :
> : : When a value is stored in an object of structure or union type,
> including in a
> : : member object, the bytes of the object representation that correspond
> to any
> : : padding bytes take unspecified values.
>
Did you see the Strategy 3 table, { 0 } ?

regards,
Ranier Vilela