koachan wrote:
> > > ```
> > > declare fp128 @fmul(fp128 %a, fp128 %b)
> > >
> > > define fp128 @square(fp128 %num) {
> > > %ret = call fp128 @fmul(fp128 %num, fp128 %num)
> > > ret fp128 %ret
> > > }
> > > ```
> >
> >
> > I think the main issue here is that the fp128s need to be passed around as
> > if it's a sret struct but I dunno how to declare it in (Ret)CC_Sparc32...
>
> You need to return false for it in `CanLowerReturn`.
Ah, this one's already sorted out but I end up in an odd situation as I
described in [this
comment](https://github.com/llvm/llvm-project/pull/162226#issuecomment-3420461662).
clang lowers `long double _Complex` as `{f128, f128}`, so if `CanLowerReturn`
is true for f128, LLVM will return it in registers (correct!) but then
autogenerated LLVM calls to C functions will be wrong (see the `sinl` example
above), meanwhile if I set it to false then autogenerated C calls will be
correct, but then `long double _Complex` will be returned as sret (which is
wrong).
https://github.com/llvm/llvm-project/pull/162226
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