[Bug target/115589] (aarch64) clobbered register variables

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115589

--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Some developers use Local Register Variables in an attempt to improve gcc’s
allocation of registers, especially in large functions. In this case the
register name is essentially a hint to the register allocator. While in some
instances this can generate better code, improvements are subject to the whims
of the allocator/optimizers. Since there are no guarantees that your
improvements won’t be lost, this usage of Local Register Variables is
discouraged.