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1<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
2
3<html>
4
5<head>
6<title>move-result-wide</title>
7<link rel=stylesheet href="opcode.css">
8</head>
9
10<body>
11
12<h1>move-result-wide</h1>
13
14<h2>Purpose</h2>
15
16<p>
17Move the double-word result of the most recent invoke-kind into the indicated
18register pair. This must be done as the instruction immediately after an
19invoke-kind whose (double-word) result is not to be ignored; anywhere else is
20invalid.
21</p>
22
23<h2>Details</h2>
24
25<table class="instruc">
26<thead>
27<tr>
28  <th>Op &amp; Format</th>
29  <th>Mnemonic / Syntax</th>
30  <th>Arguments</th>
31</tr>
32</thead>
33<tbody>
34<tr>
35  <td>0b 11x</td>
36  <td>move-result-wide vAA</td>
37  <td><code>A:</code> destination register pair (8 bits)</td>
38</tr>
39</tbody>
40</table>
41
42<h2>Constraints</h2>
43
44<ul>
45  <li>
46    A+1 must be a valid register index in the current stack frame (which
47    includes A itself being valid).
48  </li>
49  <li>
50    The instruction must be immediately preceded (in the code array) by an
51    invoke-kind instruction.
52  </li>
53  <li>
54    The instruction must be immediately reached (in the actual control flow)
55    through returning from this invoke-kind instruction (it must not be jumped
56    to).
57  </li>
58  <li>
59    The result delivered by the invoke-kind instruction must be either a long
60    or a double value.
61  </li>
62</ul>
63
64<h2>Behavior</h2>
65
66<ul>
67  <li>
68    The upper 32 bits of the result delivered by the invoke-kind instruction are
69    moved to register vA, that is, vA' = result >> 0x20.
70  </li>
71  <li>
72    The lower 32 bits of the result delivered by the invoke-kind instruction are
73    moved to register v(A+1), that is, v(A+1)' = result & 0xffffffff.
74  </li>
75  <li>
76    If register v(A-1) is the lower half of a register pair, register v(A-1)'
77    becomes undefined.
78  </li>
79  <li>
80    If register v(A+2) is the upper half of a register pair, register v(A+2)'
81    becomes undefined.
82  </li>
83</ul>
84
85<h2>Exceptions</h2>
86
87<p>
88None.
89</p>
90
91<h2>Notes</h2>
92
93<p>
94This instruction can also be thought of as reading the contents of a special
95"result" register that is made valid and defined by executing a non-void return
96instruction or a filled-new-array instruction. The execution of any other
97instruction (including this one) renders this special register invalid.
98</p>
99
100</body>
101</html>
102