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8    <title>rsq - Reciprocal square root</title>
9  </head>
10  <body>
11    <h1>rsq - Reciprocal square root</h1>
12
13    <h2>Calling Format</h2>
14    <div class="section">
15      <pre class="definition">
16rsq     dest, src{ .x | .y | .z | .w }
17</pre>
18    </div>
19
20    <h2>Operands</h2>
21    <div class="section">
22      <table class="arguments">
23        <thead>
24          <tr>
25            <th>Name</th>
26            <td>Registers</td>
27          </tr>
28        </thead>
29        <tr>
30          <th>dest</th>
31          <td>An output register or temporary register.</td>
32        </tr>
33        <tr>
34          <th>src</th>
35          <td>A temporary register, input register, or floating-point constant register.</td>
36        </tr>
37      </table>
38      <p class="notice">
39        Only one component must be specified for <SPAN class="argument">src</SPAN>.<BR>
40      </p>
41    </div>
42
43    <h2>Overview</h2>
44    <div class="section">
45      <p>
46        Calculates the inverse square root.<BR> <br> If the result of the operation is positive or negative infinity, <CODE>NaN</CODE> may be output. <br>Use the <a href="../flowcntl/cmp.html">cmp</a> instruction if you need to distinguish between <CODE>NaN</CODE> and positive or negative infinity.<BR>
47      </p>
48    </div>
49
50    <h2>Operation</h2>
51    <div class="section">
52<pre class="definition">
53tmp = src { .x | .y | .z | .w }
54dest.x = 1 / sqrt ( tmp )
55dest.y = 1 / sqrt ( tmp )
56dest.z = 1 / sqrt ( tmp )
57dest.w = 1 / sqrt ( tmp )
58</pre>
59    </div>
60
61    <h2>Code Example</h2>
62    <div class="section">
63<pre class="definition">
64rsq     r0,     c1.x
65</pre>
66    </div>
67
68    <h2>Timetable</h2>
69    <div class="section">
70      <table class="timetable">
71        <tr>
72          <th></th>
73          <th>1</th><th>2</th><th>3</th><th>4</th><th>5</th>
74        </tr>
75        <tr>
76          <th>rsq</th>
77          <td class="read">read</td>
78          <td class="RSQ" colspan="2">RCP / RSQ</td>
79          <td class="post">post</td>
80          <td class="write">write</td>
81          <td class="dummy"></td>
82        </tr>
83      </table>
84    </div>
85
86
87  <h2>Revision History</h2>
88  <div class="section">
89    <dl class="history">
90      <dt>2011/12/20</dt>
91      <dd>Initial version.<br />
92      </dd>
93    </dl>
94  </div>
95
96  <hr><p>CONFIDENTIAL</p></body>
97</html>