https://gcc.gnu.org/bugzilla/show_bug.cgi?id=128056
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Richard Biener from comment #2)
> So we have vector(16) bool as rtype but of course vectype is vector(32)
> unsigned char. We take that from the simdclone fndecl, it isn't part of the
> simdclone
> info apparently.
>
> Can we change the simdclone fndecl return type to not use a _Bool component
> type ? Is it supposed to return a vector mask, aka -1 vs 0 elements?
On x86, the ABI doesn't say, it has only {,un}signed {char,short,int,long,long
long}, pointers and {float,double} cases in its tables, except the mask
parameter is documented to be characteristic data type with 0 and all ones bit
patterns on pre-AVX512 and on AVX512 GPR 1 bit per bool.
So, I assume yes, it is actually returning or accepting unsigned char or
something like that instead with 0 and all ones bit patterns.
What do other targets do is unknown, but because they've likely copied and
modified it from the Intel ABI, most likely it is similar.
Would be useful to see what ICC and/or clang does.
