https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114437
--- Comment #3 from xog4n...@a-n.cc ---
Just to confirm, is this an incorrect constraint for the intended goal of
convincing the compiler that the value is used and modified, without actually
doing either and preserving the value, or am I just using it wrong in this
particular example? I'm somewhat surprised since this inline asm snippet is
used in multiple well-known micro-benchmarking libraries.
Is the following version correct?
```
asm volatile("" : "=m,r"(arg) : "0,0"(arg) : "memory");
```
