s-barannikov 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).
Maybe @arsenm can give some clues
https://github.com/llvm/llvm-project/pull/162226
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