<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html> <head> <title>move-wide</title> <link rel=stylesheet href="opcode.css"> </head> <body> <h1>move-wide</h1> <h2>Purpose</h2> <p> Move the contents of one register-pair to another. </p> <p> Note: It is legal to move from vN to either vN-1 or vN+1, so implementations must arrange for both halves of a register pair to be read before anything is written. </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>04 12x</td> <td>move-wide vA, vB</td> <td><code>A:</code> destination register pair (4 bits)<br/> <code>B:</code> source register pair (4 bits)</td> </tr> <tr> <td>05 22x</td> <td>move-wide/from16 vAA, vBBBB</td> <td><code>A:</code> destination register pair (8 bits)<br/> <code>B:</code> source register pair (16 bits)</td> </tr> <tr> <td>06 32x</td> <td>move-wide/16 vAAAA, vBBBB</td> <td><code>A:</code> destination register pair (16 bits)<br/> <code>B:</code> source register pair (16 bits)</td> </tr> </tbody> </table> <h2>Constraints</h2> <ul> <li> Both A+1 and B+1 must be valid register indices in the current stackframe (which includes A and B being valid). </li> <li> Register vB must be the lower half of a register pair (which excludes the case of it containing a reference). </li> <li> Both register vB and v(B+1) must be defined. </li> </ul> <h2>Behavior</h2> <ul> <li> The value of register vB is moved to register vA, that is, vA' = vB. </li> <li> The value of register v(B+1) is moved to register v(A+1), that is, v(A+1)' = v(B+1). </li> <li> If register v(A-1) is the lower half of a register pair, then v(A-1)' becomes undefined. </li> <li> If register v(A+2) is the upper half of a register pair, then v(A+2)' becomes undefined. </li> <li> If A = B-1, then v(B+1)' becomes undefined. </li> <li> If A = B+1, then v(B)' becomes undefined. </li> </ul> <h2>Exceptions</h2> <p> None. </p> </body> </html>