[Bug c/85185] Wider-than-expected load for struct member used as operand of inline-asm with memory clobber at -Og

[segher at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=85185

--- Comment #12 from Segher Boessenkool <segher at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #11)
> as mentioned in another bug, this is more of a documentation issue and the
> internal details on how inline-asm works.

Yup.  I suggest we advice to always use a register-size variable for an
"r" operand: so not smaller, and not any random expression, but a simple
variable.

Are there situations where this is a limitation?