e">Sleef_quad</b> <i class="var">a</i> );<br/>
<br/>
<span class="normal">Link with</span> -lsleefquad -ltlfloat.
</p>

<p class="header">Description</p>

<p class="noindent">
  These functions evaluate the inverse hyperbolic tangent function of a value
  in <i class="var">a</i>. The error bound of the returned value is
  1.0 ULP.
</p>

<hr/>

<p class="funcname"><b id="Sleef_truncq1" class="func">Sleef_truncq1</b>, <b id="Sleef_truncq1_purec" class="func">Sleef_truncq1_purec</b>, <b id="Sleef_truncq1_purec