[Bug target/81273] Wrong code generated for ARM setting volatile struct field with a literal

["rearnsha at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81273

--- Comment #4 from Richard Earnshaw <rearnsha at gcc dot gnu.org> ---
(In reply to LdB from comment #3)
> I am stunned you could not build the code the only requirement is you
> include the stdint.h so the uint32_t types are defined. I will fix the typos
> are you really saying you can't compile this?
> 

Most compiler developers do not install a complete build environment when
testing bugs.  As such, they do not have the headers available.  This is why
our bug reporting rules ask you to post _preprocessed_ source code.

You've also failed to give:

The options used to configure the compiler when you built it (see the output of
gcc -v).

The list of options you passed to the compiler when running it.  We can only
infer -O2 from your comments.

> Alignment is not really a concern it's a hardware register to the CPU so
> it's a given.

Absolutely alignment is the issue here.  Packed says that the object can be on
any alignment boundary and that materially affects the compiler's behaviour
here.