https://gcc.gnu.org/bugzilla/show_bug.cgi?id=88284
sandra at gcc dot gnu.org changed:
What |Removed |Added
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CC| |sandra at gcc dot gnu.org
--- Comment #1 from sandra at gcc dot gnu.org ---
The current behavior is intentional. GCC treats I/O peripheral memory as
volatile, so accesses are not re-ordered with respect to other instructions.
