On Wed, 31 May 2023, Jₑₙₛ Gustedt wrote:

> Again, this is not an extension but an optional feature, and this has
> nothing of bleeding edge. This is present in compilers since ages, and
> everybody is using their specific ways to go around the restrictions
> of previous C standards.

So, to make sure, by compiler support do you mean __int128 here? It is
not supported on 32-bit platforms neither by GCC nor by LLVM. On 64-bit
platforms it is piggy-backing on double-word operations support required
for implementing 64-bit 'long long' on 32-bit platforms.

Alexander