fix_8cpp-source.html

Tixys source code, include G.711, G.726, IMA-ADPCM etc.

00198             }
00199         bit >>= 1;
00200         }
00201     <span class="keywordflow">while</span>(bit);
00202 
00203 <span class="preprocessor">#else</span>
00204 <span class="preprocessor"></span>
00205     <span class="comment">// calculate the integer part of result (bits 31 to 16)</span>
00206     <span class="keywordflow">switch</span>(intBits)
00207         {
00208         <span class="keywordflow">case</span> 14:
00209             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;14))
00210                 a -= (b&lt;&lt;14), r += 1&lt;&lt;(14+16);
00211         <span class="keywordflow">case</span> 13:
00212             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;13))
00213                 a -= (b&lt;&lt;13), r += 1&lt;&lt;(13+16);
00214         <span class="keywordflow">case</span> 12:
00215             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;12))
00216                 a -= (b&lt;&lt;12), r += 1&lt;&lt;(12+16);
00217         <span class="keywordflow">case</span> 11:
00218             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;11))
00219                 a -= (b&lt;&lt;11), r += 1&lt;&lt;(11+16);
00220         <span class="keywordflow">case</span> 10:
00221             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;10))
00222                 a -= (b&lt;&lt;10), r += 1&lt;&lt;(10+16);
00223         <span class="keywordflow">case</span> 9:
00224             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;9))
00225                 a -= (b&lt;&lt;9), r += 1&lt;&lt;(9+16);
00226         <span class="keywordflow">case</span> 8:
00227             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;8))
00228                 a -= (b&lt;&lt;8), r += 1&lt;&lt;(8+16);
00229         <span class="keywordflow">case</span> 7:
00230             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;7))
00231                 a -= (b&lt;&lt;7), r += 1&lt;&lt;(7+16);
00232         <span class="keywordflow">case</span> 6:
00233             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;6))
00234                 a -= (b&lt;&lt;6), r += 1&lt;&lt;(6+16);
00235         <span class="keywordflow">case</span> 5:
00236             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;5))
00237                 a -= (b&lt;&lt;5), r += 1&lt;&lt;(5+16);
00238         <span class="keywordflow">case</span> 4:
00239             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;4))
00240                 a -= (b&lt;&lt;4), r += 1&lt;&lt;(4+16);
00241         <span class="keywordflow">case</span> 3:
00242             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;3))
00243                 a -= (b&lt;&lt;3), r += 1&lt;&lt;(3+16);
00244         <span class="keywordflow">case</span> 2:
00245             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;2))
00246                 a -= (b&lt;&lt;2), r += 1&lt;&lt;(2+16);
00247         <span class="keywordflow">case</span> 1:
00248             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;1))
00249                 a -= (b&lt;&lt;1), r += 1&lt;&lt;(1+16);
00250         <span class="keywordflow">case</span> 0:
00251             <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=((<a class="code" href="group__integers.html#ga2">uint32</a>)b&lt;&lt;0))
00252                 a -= (b&lt;&lt;0), r += 1&lt;&lt;(0+16);
00253             <span class="keywordflow">break</span>;
00254     <span class="keywordflow">default</span>:
00255         <span class="comment">// produce saturated result</span>
00256         <span class="keywordflow">return</span> (r&lt;0) ? 0x80000000 : 0x7fffffff; <span class="comment">// saturated result</span>
00257         }
00258 
00259     <span class="comment">// calculate the fractional part of result (bits 15 to 0)</span>
00260     a &lt;&lt;= 1;
00261     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00262         a -= b, r += 1&lt;&lt;15;
00263     a &lt;&lt;= 1;
00264     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00265         a -= b, r += 1&lt;&lt;14;
00266     a &lt;&lt;= 1;
00267     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00268         a -= b, r += 1&lt;&lt;13;
00269     a &lt;&lt;= 1;
00270     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00271         a -= b, r += 1&lt;&lt;12;
00272     a &lt;&lt;= 1;
00273     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00274         a -= b, r += 1&lt;&lt;11;
00275     a &lt;&lt;= 1;
00276     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00277         a -= b, r += 1&lt;&lt;10;
00278     a &lt;&lt;= 1;
00279     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00280         a -= b, r += 1&lt;&lt;9;
00281     a &lt;&lt;= 1;
00282     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00283         a -= b, r += 1&lt;&lt;8;
00284     a &lt;&lt;= 1;
00285     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00286         a -= b, r += 1&lt;&lt;7;
00287     a &lt;&lt;= 1;
00288     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00289         a -= b, r += 1&lt;&lt;6;
00290     a &lt;&lt;= 1;
00291     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00292         a -= b, r += 1&lt;&lt;5;
00293     a &lt;&lt;= 1;
00294     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00295         a -= b, r += 1&lt;&lt;4;
00296     a &lt;&lt;= 1;
00297     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00298         a -= b, r += 1&lt;&lt;3;
00299     a &lt;&lt;= 1;
00300     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00301         a -= b, r += 1&lt;&lt;2;
00302     a &lt;&lt;= 1;
00303     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00304         a -= b, r += 1&lt;&lt;1;
00305     a &lt;&lt;= 1;
00306     <span class="keywordflow">if</span>((<a class="code" href="group__integers.html#ga2">uint32</a>)a&gt;=(<a class="code" href="group__integers.html#ga2">uint32</a>)b)
00307         a -= b, r += 1&lt;&lt;0;
00308 
00309 <span class="preprocessor">#endif</span>
00310 <span class="preprocessor"></span>
00311     <span class="keywordflow">return</span> (r&lt;0) ? 0x80000000-r : r;
00312 
00313     }
00314 
00315 
<a name="l00316"></a><a class="code" href="classFix.html#e5">00316</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__fix.html#ga0">fix</a> <a class="code" href="classFix.html#e5">Fix::Sqrt</a>(ufix a)
00317     {
00318     <a class="code" href="group__fix.html#ga1">ufix</a> r,nr,m;
00319 
00320     <span class="comment">// calculate integer part (bits 31 to 16)</span>
00321     r = 0;
00322     m = 0x40000000;
00323     <span class="keywordflow">do</span>
00324         {
00325         nr = r+m;
00326         <span class="keywordflow">if</span>(nr&lt;=a)
00327             {
00328             a -= nr;
00329             r = nr+m;
00330             }
00331         r &gt;&gt;= 1;
00332         m &gt;&gt;= 2;
00333         }
00334     <span class="keywordflow">while</span>(m);
00335 
00336     <span class="comment">// calculate bits 15 to 8</span>
00337     r &lt;&lt;= 8;
00338     a &lt;&lt;= 8;
00339     m = 0x40;
00340     <span class="keywordflow">do</span>
00341         {
00342         nr = r+m;
00343         <span class="keywordflow">if</span>(nr&lt;=a)
00344             {
00345             a -= nr;
00346             r = nr+m;
00347             }
00348         r &gt;&gt;= 1;
00349         m &gt;&gt;= 2;
00350         }
00351     <span class="keywordflow">while</span>(m);
00352 
00353     <span class="comment">// calculate bits 7 to 0</span>
00354     r &lt;&lt;= 8;
00355     a &lt;&lt;= 8;
00356     m = 0x40;
00357     <span class="keywordflow">do</span>
00358         {
00359         nr = r+m;
00360         <span class="keywordflow">if</span>(nr&lt;=a)
00361             {
00362             a -= nr;
00363             r = nr+m;
00364             }
00365         r &gt;&gt;= 1;
00366         m &gt;&gt;= 2;
00367         }
00368     <span class="keywordflow">while</span>(m);
00369 
00370     <span class="comment">// round result</span>
00371     <span class="keywordflow">if</span>(r&lt;a)
00372         r++;
00373     
00374     <span class="keywordflow">return</span> r;
00375     }
00376 
00377 
<a name="l00378"></a><a class="code" href="classFix.html#e6">00378</a> <a class="code" href="common_8h.html#a2">EXPORT</a> <a class="code" href="group__fix.html#ga0">fix</a> <a class="code" href="classFix.html#e6">Fix::Log2</a>(ufix a)
00379     {
00380     <span class="comment">// trap 0</span>