Re: [RFC PATCH] crypto: riscv: scalar accelerated GHASH

[Qingfang Deng]

Hi Jeffrey,

On Thu, Apr 17, 2025 at 3:40 PM Jeffrey Walton <noloader@xxxxxxxxx> wrote:
>
> On Thu, Apr 17, 2025 at 3:25 AM Qingfang Deng <dqfext@xxxxxxxxx> wrote:
> >
> > Hi Ard,
> >
> > On Thu, Apr 17, 2025 at 2:58 PM Ard Biesheuvel <ardb@xxxxxxxxxx> wrote:
> > > [...]
> > >
> > > Also, do you need to test for int128 support? Or is that guaranteed
> > > for all compilers that are supported by the RISC-V port?
> >
> > I believe int128 support is available for all 64-bit targets.
>
> You can verify the compiler supports int128 with the following macro:
>
>     #if (__SIZEOF_INT128__ >= 16)
>     ...
>     #endif
>
> Also see <https://gcc.gnu.org/pipermail/gcc-help/2015-August/124862.html>.

There is a Kconfig symbol ARCH_SUPPORTS_INT128. I may switch to that.

>
> Jeff