[Bug rtl-optimization/118925] Comparison of the copy of a volatile register variable instead of the (register) variable

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118925

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |INVALID

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
https://gcc.gnu.org/onlinedocs/gcc-14.2.0/gcc/Global-Register-Variables.html

Do not use type qualifiers such as const and volatile, as the outcome may be
contrary to expectations. In particular, using the volatile qualifier does not
fully prevent the compiler from optimizing accesses to the register.


In fact it is DOCUMENTED this way.