[Bug target/82158] _Noreturn functions that do return clobber caller's registers on ARM32 (but not other arches)

[peter at cordes dot ca]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82158

Peter Cordes <peter at cordes dot ca> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|INVALID                     |WONTFIX

--- Comment #11 from Peter Cordes <peter at cordes dot ca> ---
Flagging this WONTFIX instead of INVALID, since I'm still convinced gcc could
do better.  What I'm proposing wouldn't be any worse than breaking the ABI on
UB.  I guess unsafe code-gen for something that gcc warns about by default is
not too bad, though.

I guess I should file a separate missed-optimization bug about not eliminating
the code from a basic block that returns in a noreturn function.

See also
https://stackoverflow.com/questions/45981545/why-does-noreturn-function-return/46407858#46407858
(description of the possible optimizations).