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| author | The Android Open Source Project <initial-contribution@android.com> | 2008-12-17 18:03:55 -0800 |
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| committer | The Android Open Source Project <initial-contribution@android.com> | 2008-12-17 18:03:55 -0800 |
| commit | 89c1feb0a69a7707b271086e749975b3f7acacf7 (patch) | |
| tree | 003624a03635e05020a47fc72a2c42934e3f0703 /docs/opcodes/opcode-0b-move-result-wide.html | |
| parent | 2ad60cfc28e14ee8f0bb038720836a4696c478ad (diff) | |
| download | android_dalvik-89c1feb0a69a7707b271086e749975b3f7acacf7.tar.gz android_dalvik-89c1feb0a69a7707b271086e749975b3f7acacf7.tar.bz2 android_dalvik-89c1feb0a69a7707b271086e749975b3f7acacf7.zip | |
Code drop from //branches/cupcake/...@124589
Diffstat (limited to 'docs/opcodes/opcode-0b-move-result-wide.html')
| -rw-r--r-- | docs/opcodes/opcode-0b-move-result-wide.html | 101 |
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diff --git a/docs/opcodes/opcode-0b-move-result-wide.html b/docs/opcodes/opcode-0b-move-result-wide.html new file mode 100644 index 000000000..c3e57793e --- /dev/null +++ b/docs/opcodes/opcode-0b-move-result-wide.html @@ -0,0 +1,101 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> + +<html> + +<head> +<title>move-result-wide</title> +<link rel=stylesheet href="opcode.css"> +</head> + +<body> + +<h1>move-result-wide</h1> + +<h2>Purpose</h2> + +<p> +Move the double-word result of the most recent invoke-kind into the indicated +register pair. This must be done as the instruction immediately after an +invoke-kind whose (double-word) result is not to be ignored; anywhere else is +invalid. +</p> + +<h2>Details</h2> + +<table class="instruc"> +<thead> +<tr> + <th>Op & Format</th> + <th>Mnemonic / Syntax</th> + <th>Arguments</th> +</tr> +</thead> +<tbody> +<tr> + <td>0b 11x</td> + <td>move-result-wide vAA</td> + <td><code>A:</code> destination register pair (8 bits)</td> +</tr> +</tbody> +</table> + +<h2>Constraints</h2> + +<ul> + <li> + A+1 must be a valid register index in the current stack frame (which + includes A itself being valid). + </li> + <li> + The instruction must be immediately preceded (in the code array) by an + invoke-kind instruction. + </li> + <li> + The instruction must be immediately reached (in the actual control flow) + through returning from this invoke-kind instruction (it must not be jumped + to). + </li> + <li> + The result delivered by the invoke-kind instruction must be either a long + or a double value. + </li> +</ul> + +<h2>Behavior</h2> + +<ul> + <li> + The upper 32 bits of the result delivered by the invoke-kind instruction are + moved to register vA, that is, vA' = result >> 0x20. + </li> + <li> + The lower 32 bits of the result delivered by the invoke-kind instruction are + moved to register v(A+1), that is, v(A+1)' = result & 0xffffffff. + </li> + <li> + If register v(A-1) is the lower half of a register pair, register v(A-1)' + becomes undefined. + </li> + <li> + If register v(A+2) is the upper half of a register pair, register v(A+2)' + becomes undefined. + </li> +</ul> + +<h2>Exceptions</h2> + +<p> +None. +</p> + +<h2>Notes</h2> + +<p> +This instruction can also be thought of as reading the contents of a special +"result" register that is made valid and defined by executing a non-void return +instruction or a filled-new-array instruction. The execution of any other +instruction (including this one) renders this special register invalid. +</p> + +</body> +</html> |