linux-kernel - Re: [PATCH v2] arm64: support _

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Message-ID: <CAHmME9oXG1AgkJM-Ya6Jns+Y6HadwGxQ+NqmF0ed=p8Zg8fiVg@mail.gmail.com>
Date:   Fri, 3 Nov 2017 15:14:13 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Will Deacon <will.deacon@....com>
Cc:     linux-arm-kernel@...ts.infradead.org,
        LKML <linux-kernel@...r.kernel.org>,
        Mark Rutland <mark.rutland@....com>,
        wangkefeng.wang@...wei.com,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>
Subject: Re: [PATCH v2] arm64: support __int128 on gcc 5+

On Fri, Nov 3, 2017 at 2:42 PM, Will Deacon <will.deacon@....com> wrote:
> We used to link against libgcc way back when, but that dependency was
> removed in commit d67703a8a69e ("arm64: kill off the libgcc dependency")
> and I'm really not keen to add it back. I also think that there might
> be licensing concerns if you link against it and make use of GCC plugins,
> but IANAL.

Considering many other architectures link to it, that seems strange to me...

>
> Shouldn't we just provide our own implementations of __ashlti3 and
> __ashrti3 instead?

I just coded up an implementation. I'm testing it now and I'll have v3
for you shortly.

Jason