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<!--StartFragment--><p class="MsoNormal"><span style="font-size: 10pt; font-family: Arial, sans-serif;" class=""> Jim: Reword the footnote for CFP2153 and show it to
CFP before submitting it to WG14.<o:p class=""></o:p></span></p>
<!--EndFragment--></blockquote></div><div class=""><br class=""></div><div class="">Please rewording and send me comments ASAP:</div><div class=""><br class=""></div><div class="">399) Implementations might have non-required features that invalidate these and other transformations that remove arithmetic operators. Examples include strict support for signaling NaNs (an optional feature) and alternate exception handling (not included in this specification).</div><br class=""><br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Sep 28, 2021, at 2:40 PM, Jim Thomas <<a href="mailto:jaswthomas@sbcglobal.net" class="">jaswthomas@sbcglobal.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">After offline discussion with Fred, I'd like to suggest the following rewording of the footnote:<div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class=""><div class="">399) Strict support for signaling NaNs (an optional feature) and alternate exception handling (not included in this specification) would invalidate these and other transformations that remove arithmetic operators.</div></div></blockquote><div class=""><div class=""><br class=""></div></div><div class=""><div class="">- Jim Thomas</div></div><div class=""><div class=""><br class=""></div><div class=""><br class=""><blockquote type="cite" class=""><div class="">On Sep 26, 2021, at 2:17 PM, Jim Thomas <<a href="mailto:jaswthomas@sbcglobal.net" class="">jaswthomas@sbcglobal.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="Content-Type" content="text/html; charset=utf-8" class=""><div style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class=""><div class="">The relevant text noted in [Cfp-interest 2106] is:</div><div class=""><br class=""></div><div class=""><blockquote type="cite" class="">F.9.2 "Expression transformations":<br class=""><br class=""> 1 × x and x/1 → x The expressions 1 × x, x/1, and x may be<br class=""> regarded as equivalent (on IEC 60559 machines,<br class=""> among others).399)<br class=""><br class=""> 399) Strict support for signaling NaNs — not required by this<br class=""> specification — would invalidate these and other transformations<br class=""> that remove arithmetic operators.<br class=""><br class=""></blockquote></div><div class=""><br class=""></div><div class="">F.8 #2 says “… The specification in this annex assumes IEC 60559 default exception handling ….” Given that, I think the statement is correct.</div><div class=""><br class=""></div><div class="">Since we do mention alternate exception handling in other contexts, we might consider expanding the footnote:</div><div class=""><br class=""></div><blockquote style="margin: 0 0 0 40px; border: none; padding: 0px;" class=""><div class="">399) Strict support for signaling NaNs and alternate exception handling — neither required by this specification — would invalidate these and other transformations that remove arithmetic operators.</div></blockquote><div class=""><br class=""></div><div class="">- Jim Thomas</div><div class=""><br class=""></div><div class=""><div class=""><blockquote type="cite" class=""><div class="">On Sep 23, 2021, at 6:35 AM, Vincent Lefevre <<a href="mailto:vincent@vinc17.net" class="">vincent@vinc17.net</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">On 2021-09-12 18:39:08 -0700, Jim Thomas wrote:<br class=""><blockquote type="cite" class="">C Annex F requires default exception handling and doesn’t provide a<br class="">way to change to alternate exception handling. In this context the<br class="">statement is correct.<br class=""></blockquote><br class="">The C standard does not provide a way to change to alternate<br class="">exception handling, but it allows an implementation to do so.<br class="">This is the problem here.<br class=""><br class="">There are notes in the standard about that, e.g. 220 in C17 "[...]<br class="">enabled traps for floating-point exceptions [...]" and 222 "IEC 60559<br class="">systems have a default non-stop mode, and typically at least one other<br class="">mode for trap handling or aborting".<br class=""><br class="">There's also F.8 "Floating-point environment", which says "It includes<br class="">also IEC 60559 dynamic rounding precision and trap enablement modes,<br class="">if the implementation supports them."<br class=""><br class="">F.8.3 makes this clear:<br class=""><br class=""> At program startup the floating-point environment is initialized as<br class=""> prescribed by IEC 60559:<br class="">[...]<br class=""> - Trapping or stopping (if supported) is disabled on all<br class=""> floating-point exceptions.<br class=""><br class="">If the intent were to disallow trapping, the standard would not say<br class="">"At program startup", but for the whole program execution.<br class=""><br class="">-- <br class="">Vincent Lefèvre <<a href="mailto:vincent@vinc17.net" class="">vincent@vinc17.net</a>> - Web: <<a href="https://www.vinc17.net/" class="">https://www.vinc17.net/</a>><br class="">100% accessible validated (X)HTML - Blog: <<a href="https://www.vinc17.net/blog/" class="">https://www.vinc17.net/blog/</a>><br class="">Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)<br class="">_______________________________________________<br class="">Cfp-interest mailing list<br class=""><a href="mailto:Cfp-interest@oakapple.net" class="">Cfp-interest@oakapple.net</a><br class=""><a href="http://mailman.oakapple.net/mailman/listinfo/cfp-interest" class="">http://mailman.oakapple.net/mailman/listinfo/cfp-interest</a><br class=""></div></div></blockquote></div><br class=""></div></div>_______________________________________________<br class="">Cfp-interest mailing list<br class=""><a href="mailto:Cfp-interest@oakapple.net" class="">Cfp-interest@oakapple.net</a><br class=""><a href="http://mailman.oakapple.net/mailman/listinfo/cfp-interest" class="">http://mailman.oakapple.net/mailman/listinfo/cfp-interest</a><br class=""></div></blockquote></div><br class=""></div></div>_______________________________________________<br class="">Cfp-interest mailing list<br class=""><a href="mailto:Cfp-interest@oakapple.net" class="">Cfp-interest@oakapple.net</a><br class="">http://mailman.oakapple.net/mailman/listinfo/cfp-interest<br class=""></div></blockquote></div><br class=""></body></html>