On Sat, Aug 19, 2023 at 11:58:31AM +0200, Jakub Jelinek via Gcc wrote:
> well. So, if aarch64-darwin wants 64-bit long double, the question is if
> it should have __float128 support and q suffix support at all. If it
> should, then it needs to initialize float128t_type_node to a distinct type
> if NULL like i386, ia64 and rs6000 backends do (i.e. for C++).
Oh, and as the comment say, one needs to decide how to mangle the types.
long_double_type_node, even when distinct from double_type_node, will
mangle unless overridden as e (double d), and float128_type_node as DF128_.
__float128 should mangle per Itanium ABI mangling as g (unless overridden)
but backend needs to do that.
Also, one needs to decide what _Float16 and __bf16 mangles as, whether
the Itanium ABI DF16_ and DF16b or something different (aarch64-linux
mangles the latter as u6__bf16 instead).
See what clang does as well...
Jakub
