<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Here's the email message laying out the issue that Joel brought to our attention as time was running out at last week's teleconference. Please note the questions at the end.<div><br></div><div>-Jim<br><div><br><div>Begin forwarded message:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>From: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Jim Thomas <<a href="mailto:jaswthomas@sbcglobal.net">jaswthomas@sbcglobal.net</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Subject: </b></span><span style="font-family:'Helvetica'; font-size:medium;"><b>constant rounding modes and type-generic macros</b><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Date: </b></span><span style="font-family:'Helvetica'; font-size:medium;">April 7, 2012 5:26:33 PM PDT<br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>To: </b></span><span style="font-family:'Helvetica'; font-size:medium;">CFP <<a href="mailto:cfp-interest@ucbtest.org">cfp-interest@ucbtest.org</a>><br></span></div><div style="margin-top: 0px; margin-right: 0px; margin-bottom: 0px; margin-left: 0px;"><span style="font-family:'Helvetica'; font-size:medium; color:rgba(0, 0, 0, 1.0);"><b>Cc: </b></span><span style="font-family:'Helvetica'; font-size:medium;">Clark Nelson <<a href="mailto:clark.nelson@intel.com">clark.nelson@intel.com</a>><br></span></div><br><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">This is intended as a summary of discussion the past few weeks about how constant rounding modes affect functions invoked by type-generic macros in <tgmath.h>. We'll discuss and try to wrap up this issue at our April meeting. <div><br><div>The current CFP spec (11) has:</div><div><br></div><div>----------</div><div>
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<!--StartFragment--><div><br></div><div>----------</div><div>A type-generic macro corresponding to a
function indicated in Table <span style="color:black;mso-themecolor:text1">2</span>
is affected by constant rounding modes (7.6.2).</div></div><div><div><div>----------</div></div></div><div><br></div><div>This implies that functions invoked by <tgmath.h> macros are affected unless macro replacement has been suppressed. Thus in</div><div><div><br></div></div><div><div>#define STDC_WANT_IEC_60559_BFP</div><div>#include <tgmath.h></div><div>#include <fenv.h></div><div>double d;</div><div>float f;</div><div>…</div><div>{</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>#pragma STDC FENV_ROUND FE_UPWARD</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div></div><div><span class="Apple-tab-span" style="white-space:pre"> </span>// Case 1</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>… cbrt(d) …</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>// Case 2</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>… cbrt(f) …</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>// Case 3</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>#undef cbrtf</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>… cbrt(f) …</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>// Case 4</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>#undef cbrt</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>… cbrt(d) …</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>// Case 5</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>… cbft(f) …</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>…</div><div>}</div><div><br></div><div>the current CFP spec says:</div><div><br></div><div>Case 1 - which invokes function cbrt shall be affected by pragma, because user has not suppressed macro expansion for cbrt. Note that <tgmath.h> may itself undef cbrt, so must take care to assure the call is affected</div><div><br></div><div>Case 2 - which invokes function cbrtf shall be affected by pragma, because user has not suppressed macro expansion for cbftf</div><div><br></div><div>Case 3 - which invokes function cbrtf shall not be affected by pragma, because user has suppressed macro expansion for cbrtf</div><div><br></div><div>Case 4 - which invokes cbrt (without help from suppressed <tgmath.h> macro) shall not be affected by pragma, because user suppressed macro expansion for cbrt</div><div><br></div><div>Case 5 - same as Case 4 but with argument converted to double</div><div><br></div><div>How does this requirement fit with C11? C11 leaves it unspecified whether functions invoked by <tgmath.h> macros are subject to macro replacement. The example in C11 6.5.1.1 provides a sample implementation for the <tgmath.h> cbrt macro using the _Generic macro. This implementation disables macro expansion for all the functions it invokes. Thus it does not give the CFP-specified behavior above in Cases 1 and 2. However, C11 does not say or imply that this sample implementation is definitive. </div><div><br></div><div>The following modification of the sample implementation in 6.5.1.1 would give the CFP-specified behavior:</div><div><br></div><div><div><div> #define cbrt(X) _Generic((X), \</div><div> long double: cbrtl(X), \</div><div> default: __round_wise_cbrt(X), \</div><div> float: cbrtf(X)</div></div> </div><div>where __round_wise_cbrt is affected by the constant rounding mode pragma (like cbrt where <math.h> but not <tgmath.h> has been included).</div><div><br></div></div><div>Any concerns about what we've specified? Is the behavior good for users? Is it reasonable to implement? Does it fit well enough with C11?</div><div><br></div><div>-Jim</div><div><br></div><div><br></div></div></blockquote></div><br></div></body></html>