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>unop</title> 7<link rel=stylesheet href="opcode.css"> 8</head> 9 10<body> 11 12<h1>unop</h1> 13 14<h2>Purpose</h2> 15 16<p> 17Perform the identified unary operation on the source register, storing the 18result in the destination register. 19</p> 20 21<h2>Details</h2> 22 23<table class="instruc"> 24<thead> 25<tr> 26 <th>Op & Format</th> 27 <th>Mnemonic / Syntax</th> 28 <th>Arguments</th> 29</tr> 30</thead> 31<tbody> 32<tr> 33 <td>7b..8f 12x</td> 34 <td><i>unop</i> vA, vB<br/> 35 7b: neg-int<br/> 36 7c: not-int<br/> 37 7d: neg-long<br/> 38 7e: not-long<br/> 39 7f: neg-float<br/> 40 80: neg-double<br/> 41 81: int-to-long<br/> 42 82: int-to-float<br/> 43 83: int-to-double<br/> 44 84: long-to-int<br/> 45 85: long-to-float<br/> 46 86: long-to-double<br/> 47 87: float-to-int<br/> 48 88: float-to-long<br/> 49 89: float-to-double<br/> 50 8a: double-to-int<br/> 51 8b: double-to-long<br/> 52 8c: double-to-float<br/> 53 8d: int-to-byte<br/> 54 8e: int-to-char<br/> 55 8f: int-to-short 56 </td> 57 <td><code>A:</code> destination register or pair (4 bits)<br/> 58 <code>B:</code> source register or pair (4 bits)</td> 59</tr> 60</tbody> 61</table> 62 63<h2>Constraints</h2> 64 65<ul> 66 <li> 67 Both A and B must be valid register indices for the current stackframe. 68 </li> 69 <li> 70 If the input type of <unop> is double or long, also B+1 must be a 71 valid register index in the current stackframe. 72 </li> 73 <li> 74 If the output type of <unop> is double or long, also A+1 must be a 75 valid register index in the current stackframe. 76 </li> 77 <li> 78 The type of register vB must match the source type of the instruction (this 79 probably needs more detail). 80 </li> 81</ul> 82 83<h2>Behavior</h2> 84 85<ul> 86 <li> 87 The given operation <unop> is performed according to the semantics 88 specified in table XXX. 89 </li> 90 <li> 91 The result is stored in register vA, that is, vA'=<unop> vB. 92 </li> 93 <li> 94 It gets a bit messy if we want to describe all the combinations of input and 95 output with and without pairs here. Probably it's better to split it up. 96 </li> 97</ul> 98 99<h2>Exceptions</h2> 100 101<ul> 102 <li> 103 ArithmeticException if an arithmetic error occurs during the instruction. 104 </li> 105</ul> 106 107</body> 108</html> 109