[PATCH 00/12] Remove bcopy and bzero optimizations

[Szabolcs Nagy]

The 02/10/2022 16:58, Adhemerval Zanella via Libc-alpha wrote:
> Both symbols are marked as legacy in POSIX.1-2001 and removed on
> POSIX.1-2008, although the prototypes are defined for _GNU_SOURCE
> or _DEFAULT_SOURCE.
> 
> Most architectures just route bcopy/bzero to internal memmove/memset
> implementation, however some do implement iFUNC variants when memset
> or memmove are also provided through iFUNC.
> 
> However, gcc already replaces bcopy with a memmove and bzero with memset
> on default configuration (to actually get a bstring libc call the code
> requires to omit string.h inclusion and built with --fno-builtin), so
> it is highly unlikely programs are actually calling libc bcopy or
> bzero symbols.
...
> So there is point in keeping such optimization.
> 
> Adhemerval Zanella (12):
>   ia64: Remove bcopy
>   powerpc: Remove bcopy optimizations
>   i386: Remove bcopy optimizations
>   x86_64: Remove bcopy optimizations
>   alpha: Remove bzero optimization
>   ia64: Remove bzero optimization
>   Remove bzero optimization
>   powerpc: Remove powerpc32 bzero optimizations
>   powerpc: Remove powerpc64 bzero optimizations
>   s390: Remove bzero optimizations
>   i686: Remove bzero optimizations
>   x86_64: Remove bzero optimizations

i see this does not affect aarch64, but i agree with the principle.

(there was a comment about the x86 bzero code that if __memsetzero
is accepted then it's easier to rename the bzero optimization instead
of removing and readding.)