[Bug middle-end/94600] Ignored volatile specifier on loop unrolling and bitfield misoptimization

[joseph at codesourcery dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94600

--- Comment #7 from joseph at codesourcery dot com <joseph at codesourcery dot com> ---
The Arm AAPCS has detailed rules for operations on individual volatile 
bit-fields, but not for this case where the whole struct is volatile and 
the operation is on the whole struct.  I think you can consider this issue 
in general as quality-of-implementation.