<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">In a recent post to STDS-754, Vincent Lefèvre wrote:<div class=""><blockquote type="cite" class="">
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<!--StartFragment--><p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;
color:red" class="">I think that the terminology should be:<br class="">
* negative: equivalent to "less than zero", i.e. "<
0";<br class="">
* negative sign: can be used for any FP number; -0 has a negative<br class="">
sign, but NaN does not have a sign;<br class="">
* negative sign bit: can be used for any FP datum.<o:p class=""></o:p></span></p>
<!--EndFragment--></blockquote></div><div class="">Do we agree with this interpretation of “negative”? </div><div class=""><br class=""></div><div class="">(I do, except for the last item. Do qNaN and sNaN data in an extended format necessarily have a sign bit? A sign bit pertains to encoding and 754 doesn’t specify an encoding for extended formats. I think this is a 754 issue.)</div><div class=""><br class=""></div><div class="">Does C require opposite-signed zeros to compare equal? Does Annex F say this explicitly? Annex F says it implicitly by reference to IEC 60559, so it should be editorial to say it explicitly in Annex F.</div><div class=""><br class=""></div><div class="">We might want to add a (foot)note to point out that negative zero and NaNs with a negative sign bit are not negative values.</div><div class=""><br class=""></div><div class="">Have we been careful enough about distinguishing the sign of a value and the bit sign of the representation? For example, 7.12.3.7 says</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>The signbit macro returns a nonzero value if and only if the sign of its argument value is negative.</div><div class=""><br class=""></div><div class="">Rabbit hole?</div><div class=""><br class=""></div><div class="">- Jim Thomas</div><div class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Nov 9, 2020, at 2:53 PM, Damian McGuckin <<a href="mailto:damianm@esi.com.au" class="">damianm@esi.com.au</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class=""><br class="">Fred,<br class=""><br class="">On Mon, 9 Nov 2020, Fred J. Tydeman wrote:<br class=""><br class=""><blockquote type="cite" class="">C in <math.h> 7.12.7.5 The pow functions has:<br class="">A domain error occurs if x is finite and negative<br class="">and y is finite and not an integer value.<br class=""></blockquote><br class="">The IEEE 754 standard sats<br class=""><br class="">pow(+/-0, y) is +INFINITY and signals Divide by Zero for y<0 finite and not odd integral<br class=""><br class="">pow(+/-0, y) is +0.0 for y>0 finite and not an odd integer (and F.10.4.5 matches this)<br class=""><br class=""><blockquote type="cite" class="">Is -0.0 negative?<br class="">Is pow(-0.0, 1.5) a domain error?<br class=""></blockquote><br class="">No. See the standard and F.10.4.5.<br class=""><br class=""><blockquote type="cite" class="">F.10.4.5<br class="">The pow functions has: pow(?0, y) returns +0 for y > 0 and not an odd integer.<br class=""></blockquote><br class=""><blockquote type="cite" class="">Should "negative" be changed to "less than zero" in the above?<br class=""></blockquote><br class="">I believe you are correct.<br class=""><br class="">BUT we have to add something to handle the case for x = -0.0 as special.<br class=""><br class="">I think the above is clear and complete. Apologies if I am did not nail it<br class=""><br class="">Regards - Damian<br class=""><br class="">Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037<br class="">Ph:+61-2-8571-0847 .. Fx:+61-2-9692-9623 | unsolicited email not wanted here<br class="">Views & opinions here are mine and not those of any past or present employer<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="">http://mailman.oakapple.net/mailman/listinfo/cfp-interest<br class=""></div></div></blockquote></div><br class=""></div></body></html>