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Re: [RFC PATCH] configure: deprecate 32 bit build hosts

From: Peter Maydell
Subject: Re: [RFC PATCH] configure: deprecate 32 bit build hosts
Date: Mon, 30 Sep 2019 12:41:45 +0100

On Mon, 30 Sep 2019 at 11:26, Alex Bennée <address@hidden> wrote:
> The int128 support is due to the fact we are going to start to see newer
> architectures with things like 128 bit shadow capability registers and
> they will be a pain to shuffle around in 32 bit generated host code as
> well as requiring writing new extra plumbing for TCG's pre/post amble to
> pass them back and forth between C and generated code. These guest
> architectures may not even be full 64 bit guests so it's not quite as
> simple as saying you can't have 64 bit guests on a 32 bit host.

I think that for int128_t in particular, the ideal answer is
that if the compiler developers want to introduce a new
abstraction like that, they should support it on all targets,
not just half of them...

-- PMM

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