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Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c) - Mailing list pgsql-hackers

From Julien Rouhaud
Subject Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)
Date
Msg-id 20220811122303.6yxzqyolhepfgyh4@jrouhaud
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In response to Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)  (Ranier Vilela <ranier.vf@gmail.com>)
Responses Re: Avoid unecessary MemSet call (src/backend/utils/cache/relcache.c)
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On Thu, Aug 11, 2022 at 08:51:53AM -0300, Ranier Vilela wrote:
> Em qui., 11 de ago. de 2022 às 08:48, Alvaro Herrera <
> alvherre@alvh.no-ip.org> escreveu:
> 
> > On 2022-Aug-11, Ranier Vilela wrote:
> >
> > > According to:
> > > https://interrupt.memfault.com/blog/c-struct-padding-initialization
> >
> Did you see the Strategy 3 table, { 0 } ?

It explicitly shows that at least Ubuntu clang version 13.0.0-2 with -01
doesn't do anything about the padding bytes (and that's after testing only 2
different compilers).  Even if those compilers didn't show any problem, we
still couldn't rely on an undefined behavior and assume that no other compilers
behave differently.

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