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Tue, 24 Nov 2020 13:22:02 +0100 (CET) From: Markus Armbruster To: Paolo Bonzini Subject: Re: [PATCH v3 10/19] qlit: Support all types of QNums References: <20201123194818.2773508-1-ehabkost@redhat.com> <20201123194818.2773508-11-ehabkost@redhat.com> <87y2irnkol.fsf@dusky.pond.sub.org> <64059fc4-62e9-204d-c477-44f5165a240d@redhat.com> Date: Tue, 24 Nov 2020 13:22:02 +0100 In-Reply-To: <64059fc4-62e9-204d-c477-44f5165a240d@redhat.com> (Paolo Bonzini's message of "Tue, 24 Nov 2020 11:56:13 +0100") Message-ID: <87im9vkkr9.fsf@dusky.pond.sub.org> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain Received-SPF: pass client-ip=63.128.21.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, 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_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=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: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?utf-8?Q?Marc-Andr=C3=A9?= Lureau , "Daniel P. =?utf-8?Q?Berrang=C3=A9?=" , Eduardo Habkost , qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Paolo Bonzini writes: > On 24/11/20 10:55, Markus Armbruster wrote: >>> + /* Larger than UINT64_MAX: */ >>> + QLIT_QNUM_DOUBLE(18446744073709552e3), >>> + /* Smaller than INT64_MIN: */ >>> + QLIT_QNUM_DOUBLE(-92233720368547758e2), >> Why "larger than UINT64_MAX" and "smaller than INT64_MIN"? >> > > I guess the point is to test values that are only representable as a > double, so (double)((uint64_t)INT64_MAX+1) wouldn't be very useful for > that: as the expression shows, it would not be a QNUM_VAL_INT but it > would be representable as QNUM_VAL_UINT. > > So these are the cases that matter the most, even though -1, 0 and > INT64_MAX+1 could be nice to have. qnum_is_equal()'s contract: * Doubles are never considered equal to integers.