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

From: Daniel P . Berrangé
Subject: Re: [RFC PATCH] configure: deprecate 32 bit build hosts
Date: Wed, 2 Oct 2019 10:10:37 +0100
User-agent: Mutt/1.12.1 (2019-06-15)

On Tue, Oct 01, 2019 at 11:02:14AM -0700, Richard Henderson wrote:
> On 10/1/19 10:56 AM, Mark Cave-Ayland wrote:
> > Just out of interest, which host/compiler combinations don't currently 
> > implement
> > int128_t?
> GCC only implements int128_t for 64-bit targets.

QEMU probes for that during configure  and sets CONFIG_INT128

If I'm reading correctly include/qemu/int128.h then provides a
fallback type based on a struct with two int64s.

This has some inconvenience though as you have to use the the (inline)
function calls for all the basic operands and will be less efficient
when using the fallback.

Presumably this is not viable for TCG ?

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