linux-kernel - Re: [RFC PATCH] crypto: riscv: scalar accelerated GHASH

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Message-ID: <CAH8yC8=9u42jK0-FrHOXvWDM-Z3jUKSSSFznTMVWUiPAgCFcTA@mail.gmail.com>
Date: Thu, 17 Apr 2025 03:39:56 -0400
From: Jeffrey Walton <noloader@...il.com>
To: Qingfang Deng <dqfext@...il.com>
Cc: Ard Biesheuvel <ardb@...nel.org>, Eric Biggers <ebiggers@...nel.org>, 
	Herbert Xu <herbert@...dor.apana.org.au>, "David S. Miller" <davem@...emloft.net>, 
	Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt <palmer@...belt.com>, 
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>, linux-crypto@...r.kernel.org, 
	linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	Christoph Müllner <christoph.muellner@...ll.eu>, 
	Heiko Stuebner <heiko.stuebner@...ll.eu>, Qingfang Deng <qingfang.deng@...lower.com.cn>
Subject: Re: [RFC PATCH] crypto: riscv: scalar accelerated GHASH

On Thu, Apr 17, 2025 at 3:25 AM Qingfang Deng <dqfext@...il.com> wrote:
>
> Hi Ard,
>
> On Thu, Apr 17, 2025 at 2:58 PM Ard Biesheuvel <ardb@...nel.org> 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>.

Jeff