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Tsirkin" To: Peter Maydell Cc: qemu-devel@nongnu.org, Paolo Bonzini , =?iso-8859-1?Q?Marc-Andr=E9?= Lureau , Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= , Philippe =?iso-8859-1?Q?Mathieu-Daud=E9?= Subject: Re: [PATCH RFC] meson: require int128 type Message-ID: <20250508104300-mutt-send-email-mst@kernel.org> References: <8c8f9a7e77e25a87b54335f7c376cb079fe67655.1746706766.git.mst@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Received-SPF: pass client-ip=170.10.129.124; envelope-from=mst@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -34 X-Spam_score: -3.5 X-Spam_bar: --- X-Spam_report: (-3.5 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1.416, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Thu, May 08, 2025 at 01:30:25PM +0100, Peter Maydell wrote: > On Thu, 8 May 2025 at 13:21, Michael S. Tsirkin wrote: > > > > compilers that QEMU requires support int128 > > (though arithmetic might be more challenging). > > As virtio wants to use int128 with bitwise opts only, > > make it simple by failing configure if not there. > > IIRC the problem is not the compiler version but whether > or not it's targeting a 32-bit host: compilers will > implement an int128 based on 2 64-bit registers, but > not one based on 4 32-bit registers. Did you check this > on all our supported host platforms ? > > (We've deprecated 32-bit host support, but not dropped > it yet, I think.) > > thanks > -- PMM Thanks for the feedback, indeed I did not. Will check some config.