On Tue, May 20, 2025 at 11:29:10AM +0800, Yang Yujie wrote:
> gcc/c-family/ChangeLog:
>
> * c-common.cc (resolve_overloaded_atomic_exchange): Truncate
> _BitInt values before atomic store.
You aren't truncating _BitInt values before atomic store, you are extending
them.
> (reso
The padding bits of _BitInt(N) are undefined in the x86-64 and
the aarch64 ABI. In general, the current lowering and expand process
perform truncations when taking a _BitInt value as input,
while leaving them as-is in the output.
By adding truncation on the output side, we can define psABIs
(e.g.
