<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="">Action item:<div class=""><div class=""><blockquote type="cite" class=""><span class="" style="font-size: 10pt; font-family: Arial, sans-serif;">AI: Jim+Fred: no prototype vs varargs prototype. Find where in C where float is promoted to double.<br class=""></span></blockquote><br class=""></div><div class="">This action item follows up on David Olsen’s suggestion to promote narrow binary interchange types to double. See</div><div class=""><br class=""></div><div class="">
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<ul style="margin-top:0in" type="disc" class="">
<li class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><a href="https://mailman.oakapple.net/pipermail/cfp-interest/2020-June/001613.html" class="">[Cfp-interest
1599] promotion for binary interchange types </a> <i class="">Jim
Thomas</i><o:p class=""></o:p></span></li>
<ul style="margin-top:0in" type="circle" class="">
<li class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif" class=""><a href="https://mailman.oakapple.net/pipermail/cfp-interest/2020-June/001648.html" class="">[Cfp-interest
1634] Re: promotion for binary interchange types </a> <i class="">Jim
Thomas</i><o:p class=""></o:p></span></li>
</ul>
</ul>
<!--EndFragment--></div><div class=""><br class=""></div><div class="">Relevant parts of C:</div><div class=""><br class=""></div><div class="">=========================</div><div class="">6.5.2.2 Function calls</div><div class=""><br class=""></div><div class="">[6] If the expression that denotes the called function has a type that does not include a prototype, the integer promotions are performed on each argument, and arguments that have type float are promoted to double. These are called the default argument promotions. …</div><div class=""><br class=""></div><div class="">[7] … The ellipsis notation in a function prototype declarator causes argument type conversion to stop after the last declared parameter. The default argument promotions are performed on trailing arguments.</div><div class=""><br class=""></div><div class=""><br class=""></div>7.16.1.1 The va_arg macro<div class=""><br class=""></div><div class="">[2] … If there is no actual next argument, or if type is not compatible with the type of the actual next argument (as promoted according to the default argument promotions), the behavior is undefined, except for the following cases:</div><div class=""><div class="">=========================</div></div><div class=""><br class=""></div><div class="">This says that the default argument promotions are performed on arguments to functions without prototypes and on arguments matching ellipsis notation for functions without prototypes, and the va-arg macro works with the default argument promotions. So if we expand the definition of default argument promotions to promote _Float16, _Float32, _Float64 to double then those promotions automatically apply for no-prototypes, ellipsis notation, and va_args.</div></div><div class=""><br class=""></div><div class="">Further discussion …</div><div class=""><br class=""></div><div class="">What would be the rationale for promoting _Float16, _Float32, _Float64 to double?</div><div class=""><br class=""></div><div class="">It allows using these types as printf arguments.<br class=""><br class="">It follows the general approach suggested by the promotion of float to double.<br class=""><br class="">It matches what David Olsen is proposing to C++. (Though he’s willing to change his proposal on this point if we specify something else.)<br class=""><br class=""></div><div class=""><br class=""></div><div class="">- Jim Thomas, with Fred Tydeman</div><div class=""><br class=""></div></body></html>