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envelope-from=schierlm@gmx.de; helo=mout.gmx.net X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, NICE_REPLY_A=-0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: guix-devel@gnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: "Development of GNU Guix and the GNU System distribution." List-Unsubscribe: , List-Archive: List-Post: X-Migadu-Queue-Id: 366AC380BF X-Spam-Score: -8.76 X-Migadu-Spam-Score: -8.76 X-Migadu-Scanner: scn0.migadu.com List-Help: List-Subscribe: , Errors-To: guix-devel-bounces+larch=yhetil.org@gnu.org Sender: guix-devel-bounces+larch=yhetil.org@gnu.org X-Migadu-Country: US X-Migadu-Flow: FLOW_IN X-TUID: kKcL51tvVLo0 Hello Andreas, Am 20.03.2023 um 15:54 schrieb Andreas Enge: > Hello Michael, > > I am attaching a simplified C file and the corresponding assembly > output; which I cannot read, but there are differences between the two > invocations of fprintf. Seems that you accidentally attached the object file (binary) instead of the assembly output. :-) > The weirdest thing is that actually the value is the integer 123. So it > should be stored in any kind of register exactly. 123 as a normalized binary floating point number would be 1.921875 =C3=97 2=E2=81=B6 and you would have to represent the mantissa in binary (1.111011=E2=82=82)= . Still this should fit into most floating point registers easily. But possibly the value computed by the algorithm of parsing the number resulted in e.g. 1.111011000000000000000000000000000000000000000000000001011=E2=82=82 =C3= =97 2=E2=81=B6 which is still 123 when converted back to a 52-bit mantissa, but something ever so slightly larger when treated as an 80-bit float with 64 bits mantissa. Or maybe I'm missing something :-) Regards, Michael