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 <span id="projectnumber">1.6.2</span>
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<div class="textblock"><code>#include "<a class="el" href="real_2prim_8h_source.html">prim.h</a>"</code><br />
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Include dependency graph for ceil.c:</div>
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Functions</h2></td></tr>
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<tr class="memitem:a1ea6d7b591132268abc2e843ababd084"><td class="memItemLeft" align="right" valign="top">double </td><td class="memItemRight" valign="bottom"><a class="el" href="ceil_8c.html#a1ea6d7b591132268abc2e843ababd084">ceil</a> (double x)</td></tr>
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<tr class="memdesc:a1ea6d7b591132268abc2e843ababd084"><td class="mdescLeft"> </td><td class="mdescRight">Mathematical ceiling function. <a href="#a1ea6d7b591132268abc2e843ababd084">More...</a><br /></td></tr>
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Variables</h2></td></tr>
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<tr class="memitem:acbd466133274923cc0785707fbdeea9a"><td class="memItemLeft" align="right" valign="top">static const double </td><td class="memItemRight" valign="bottom"><a class="el" href="ceil_8c.html#acbd466133274923cc0785707fbdeea9a">huge</a> = 1.0e300</td></tr>
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<tr class="separator:acbd466133274923cc0785707fbdeea9a"><td class="memSeparator" colspan="2"> </td></tr>
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<h2 class="groupheader">Function Documentation</h2>
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<td class="memname">double ceil </td>
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<td>(</td>
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<td class="paramtype">double </td>
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<td class="paramname"><em>x</em></td><td>)</td>
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<td></td>
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<p>Mathematical ceiling function. </p>
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<dl class="section version"><dt>Version</dt><dd>1.3 </dd></dl>
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<dl class="section date"><dt>Date</dt><dd>95/01/18</dd></dl>
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<pre>
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Return x rounded toward -inf to integral value
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Method:
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Bit twiddling.
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Exception:
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Inexact flag raised if x not equal to ceil(x).
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</pre> <dl class="section copyright"><dt>Copyright</dt><dd>Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. Developed at SunSoft, a Sun Microsystems, Inc. business. Permission to use, copy, modify, and distribute this software is freely granted, provided that this notice is preserved. </dd></dl>
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<p>Definition at line <a class="el" href="ceil_8c_source.html#l00065">65</a> of file <a class="el" href="ceil_8c_source.html">ceil.c</a>.</p>
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<p>References <a class="el" href="ceil_8c_source.html#l00046">huge</a>.</p>
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<div class="fragment"><div class="line"><a name="l00066"></a><span class="lineno"> 66</span> {</div><div class="line"><a name="l00067"></a><span class="lineno"> 67</span>  <a class="code" href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a> i0,i1,j0;</div><div class="line"><a name="l00068"></a><span class="lineno"> 68</span>  <a class="code" href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a> i,j;</div><div class="line"><a name="l00069"></a><span class="lineno"> 69</span>  <a class="code" href="real_2prim_8h.html#a6dadc713499e14ba3088a55409a18983">EXTRACT_WORDS</a>(i0,i1,x);</div><div class="line"><a name="l00070"></a><span class="lineno"> 70</span>  j0 = ((i0>>20)&0x7ff)-0x3ff;</div><div class="line"><a name="l00071"></a><span class="lineno"> 71</span>  <span class="keywordflow">if</span>(j0<20) {</div><div class="line"><a name="l00072"></a><span class="lineno"> 72</span>  <span class="keywordflow">if</span>(j0<0) { <span class="comment">/* raise inexact if x != 0 */</span></div><div class="line"><a name="l00073"></a><span class="lineno"> 73</span>  <span class="keywordflow">if</span>(<a class="code" href="ceil_8c.html#acbd466133274923cc0785707fbdeea9a">huge</a>+x>0.0) { <span class="comment">/* return 0*sign(x) if |x|<1 */</span></div><div class="line"><a name="l00074"></a><span class="lineno"> 74</span>  <span class="keywordflow">if</span>(i0<0) {</div><div class="line"><a name="l00075"></a><span class="lineno"> 75</span>  i0=0x80000000;</div><div class="line"><a name="l00076"></a><span class="lineno"> 76</span>  i1=0;</div><div class="line"><a name="l00077"></a><span class="lineno"> 77</span>  }</div><div class="line"><a name="l00078"></a><span class="lineno"> 78</span>  <span class="keywordflow">else</span> <span class="keywordflow">if</span>((i0|i1)!=0) {</div><div class="line"><a name="l00079"></a><span class="lineno"> 79</span>  i0=0x3ff00000;</div><div class="line"><a name="l00080"></a><span class="lineno"> 80</span>  i1=0;</div><div class="line"><a name="l00081"></a><span class="lineno"> 81</span>  }</div><div class="line"><a name="l00082"></a><span class="lineno"> 82</span>  }</div><div class="line"><a name="l00083"></a><span class="lineno"> 83</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00084"></a><span class="lineno"> 84</span>  i = (0x000fffff)>>j0;</div><div class="line"><a name="l00085"></a><span class="lineno"> 85</span>  <span class="keywordflow">if</span>(((i0&i)|i1)==0) <span class="keywordflow">return</span> x; <span class="comment">/* x is integral */</span></div><div class="line"><a name="l00086"></a><span class="lineno"> 86</span>  <span class="keywordflow">if</span>(<a class="code" href="ceil_8c.html#acbd466133274923cc0785707fbdeea9a">huge</a>+x>0.0) { <span class="comment">/* raise inexact flag */</span></div><div class="line"><a name="l00087"></a><span class="lineno"> 87</span>  <span class="keywordflow">if</span>(i0>0) i0 += (0x00100000)>>j0;</div><div class="line"><a name="l00088"></a><span class="lineno"> 88</span>  i0 &= (~i);</div><div class="line"><a name="l00089"></a><span class="lineno"> 89</span>  i1=0;</div><div class="line"><a name="l00090"></a><span class="lineno"> 90</span>  }</div><div class="line"><a name="l00091"></a><span class="lineno"> 91</span>  }</div><div class="line"><a name="l00092"></a><span class="lineno"> 92</span>  } <span class="keywordflow">else</span> <span class="keywordflow">if</span> (j0>51) {</div><div class="line"><a name="l00093"></a><span class="lineno"> 93</span>  <span class="keywordflow">if</span>(j0==0x400) <span class="keywordflow">return</span> x+x; <span class="comment">/* inf or NaN */</span></div><div class="line"><a name="l00094"></a><span class="lineno"> 94</span>  <span class="keywordflow">else</span> <span class="keywordflow">return</span> x; <span class="comment">/* x is integral */</span></div><div class="line"><a name="l00095"></a><span class="lineno"> 95</span>  } <span class="keywordflow">else</span> {</div><div class="line"><a name="l00096"></a><span class="lineno"> 96</span>  i = ((<a class="code" href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a>)(0xffffffff))>>(j0-20);</div><div class="line"><a name="l00097"></a><span class="lineno"> 97</span>  <span class="keywordflow">if</span>((i1&i)==0) <span class="keywordflow">return</span> x; <span class="comment">/* x is integral */</span></div><div class="line"><a name="l00098"></a><span class="lineno"> 98</span>  <span class="keywordflow">if</span>(<a class="code" href="ceil_8c.html#acbd466133274923cc0785707fbdeea9a">huge</a>+x>0.0) { <span class="comment">/* raise inexact flag */</span></div><div class="line"><a name="l00099"></a><span class="lineno"> 99</span>  <span class="keywordflow">if</span>(i0>0) {</div><div class="line"><a name="l00100"></a><span class="lineno"> 100</span>  <span class="keywordflow">if</span>(j0==20) i0+=1;</div><div class="line"><a name="l00101"></a><span class="lineno"> 101</span>  <span class="keywordflow">else</span> {</div><div class="line"><a name="l00102"></a><span class="lineno"> 102</span>  j = i1 + (1<<(52-j0));</div><div class="line"><a name="l00103"></a><span class="lineno"> 103</span>  <span class="comment">// NOTICE: Is this a correct cast?</span></div><div class="line"><a name="l00104"></a><span class="lineno"> 104</span>  <span class="keywordflow">if</span>((<a class="code" href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a>)j<(<a class="code" href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a>)i1) i0+=1; <span class="comment">/* got a carry */</span></div><div class="line"><a name="l00105"></a><span class="lineno"> 105</span>  i1 = j;</div><div class="line"><a name="l00106"></a><span class="lineno"> 106</span>  }</div><div class="line"><a name="l00107"></a><span class="lineno"> 107</span>  }</div><div class="line"><a name="l00108"></a><span class="lineno"> 108</span>  i1 &= (~i);</div><div class="line"><a name="l00109"></a><span class="lineno"> 109</span>  }</div><div class="line"><a name="l00110"></a><span class="lineno"> 110</span>  }</div><div class="line"><a name="l00111"></a><span class="lineno"> 111</span>  <a class="code" href="real_2prim_8h.html#a7f681b987a25d4692229be4e0be0cdf1">INSERT_WORDS</a>(x,i0,i1);</div><div class="line"><a name="l00112"></a><span class="lineno"> 112</span>  <span class="keywordflow">return</span> x;</div><div class="line"><a name="l00113"></a><span class="lineno"> 113</span> }</div><div class="ttc" id="real_2prim_8h_html_a7f681b987a25d4692229be4e0be0cdf1"><div class="ttname"><a href="real_2prim_8h.html#a7f681b987a25d4692229be4e0be0cdf1">INSERT_WORDS</a></div><div class="ttdeci">#define INSERT_WORDS(d, ix0, ix1)</div><div class="ttdoc">Set a double from two 32 bit ints. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00187">prim.h:187</a></div></div>
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<div class="ttc" id="ceil_8c_html_acbd466133274923cc0785707fbdeea9a"><div class="ttname"><a href="ceil_8c.html#acbd466133274923cc0785707fbdeea9a">huge</a></div><div class="ttdeci">static const double huge</div><div class="ttdef"><b>Definition:</b> <a href="ceil_8c_source.html#l00046">ceil.c:46</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_a6dadc713499e14ba3088a55409a18983"><div class="ttname"><a href="real_2prim_8h.html#a6dadc713499e14ba3088a55409a18983">EXTRACT_WORDS</a></div><div class="ttdeci">#define EXTRACT_WORDS(ix0, ix1, d)</div><div class="ttdoc">Get two 32 bit ints from a double. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00153">prim.h:153</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_ae91287c8a5f73a8a22a100f50dc4de77"><div class="ttname"><a href="real_2prim_8h.html#ae91287c8a5f73a8a22a100f50dc4de77">sword</a></div><div class="ttdeci">signed int sword</div><div class="ttdoc">32 bit signed integer. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00107">prim.h:107</a></div></div>
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<div class="ttc" id="real_2prim_8h_html_a6e60fe0e0f9f8801507e15fe2d893751"><div class="ttname"><a href="real_2prim_8h.html#a6e60fe0e0f9f8801507e15fe2d893751">uword</a></div><div class="ttdeci">unsigned int uword</div><div class="ttdoc">32 bit unsigned integer. </div><div class="ttdef"><b>Definition:</b> <a href="real_2prim_8h_source.html#l00101">prim.h:101</a></div></div>
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<td class="memname">const double huge = 1.0e300</td>
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<p>Definition at line <a class="el" href="ceil_8c_source.html#l00046">46</a> of file <a class="el" href="ceil_8c_source.html">ceil.c</a>.</p>
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<p>Referenced by <a class="el" href="ceil_8c_source.html#l00065">ceil()</a>.</p>
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