https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110516
ibuclaw at gcc dot gnu.org changed:
What |Removed |Added
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CC| |ibuclaw at gcc dot gnu.org
--- Comment #1 from ibuclaw at gcc dot gnu.org ---
(In reply to Witold Baryluk from comment #0)
> gcc 12.2.0 (from Debian stable) and gcc trunk 14.0.0 (in godbolt) tested.
>
> core.volatile.volatileLoad simply does not work.
>
> 1) It merges loads.
> 2) It removes unused loads at -O1 and higher.
>
> Example:
>
> void actualRun(ubyte* ptr1) {
> import core.volatile : volatileLoad;
> volatileLoad(ptr1);
> volatileLoad(ptr1);
> volatileLoad(ptr1);
> volatileLoad(ptr1);
> }
Actually, doesn't seem to be doing either 1 or 2, it looks like the statement
is just dropped altogether as no obvious side-effect was picked up from the
expression to which the intrinsic was expanded into.
https://d.godbolt.org/z/361x4vKfn
