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| <title>binop/2addr</title> |
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| <h1>binop/2addr</h1> |
| |
| <h2>Purpose</h2> |
| |
| <p> |
| Perform the identified binary operation on the two source registers, storing the |
| result in the first source register. |
| </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>b0..cf 12x</td> |
| <td><i>binop</i>/2addr vA, vB<br/> |
| b0: add-int/2addr<br/> |
| b1: sub-int/2addr<br/> |
| b2: mul-int/2addr<br/> |
| b3: div-int/2addr<br/> |
| b4: rem-int/2addr<br/> |
| b5: and-int/2addr<br/> |
| b6: or-int/2addr<br/> |
| b7: xor-int/2addr<br/> |
| b8: shl-int/2addr<br/> |
| b9: shr-int/2addr<br/> |
| ba: ushr-int/2addr<br/> |
| bb: add-long/2addr<br/> |
| bc: sub-long/2addr<br/> |
| bd: mul-long/2addr<br/> |
| be: div-long/2addr<br/> |
| bf: rem-long/2addr<br/> |
| c0: and-long/2addr<br/> |
| c1: or-long/2addr<br/> |
| c2: xor-long/2addr<br/> |
| c3: shl-long/2addr<br/> |
| c4: shr-long/2addr<br/> |
| c5: ushr-long/2addr<br/> |
| c6: add-float/2addr<br/> |
| c7: sub-float/2addr<br/> |
| c8: mul-float/2addr<br/> |
| c9: div-float/2addr<br/> |
| ca: rem-float/2addr<br/> |
| cb: add-double/2addr<br/> |
| cc: sub-double/2addr<br/> |
| cd: mul-double/2addr<br/> |
| ce: div-double/2addr<br/> |
| cf: rem-double/2addr |
| </td> |
| <td><code>A:</code> destination and first source register or pair |
| (4 bits)<br/> |
| <code>B:</code> second source register or pair (4 bits)</td> |
| </tr> |
| </tbody> |
| </table> |
| |
| <h2>Constraints</h2> |
| |
| <ul> |
| <li> |
| Both A and B must be valid register indices in the current stackframe. |
| </li> |
| <li> |
| For the -long and -double variants, also A+1 and B+1 must be valid register |
| indices. |
| </li> |
| <li> |
| Registers vA and vB must be defined. They must both contain values that |
| match the variant of the instruction (it's probably better to split this up |
| into multiple pages again). |
| </li> |
| </ul> |
| |
| <h2>Behavior</h2> |
| |
| <ul> |
| <li> |
| The given operation <binop> is performed according to the semantics |
| specified in table XXX. |
| </li> |
| <li> |
| The result is stored in register vA, that is, vA'=vA <binop> vB. |
| </li> |
| <li> |
| For the -double and -long variants, (vA+1) is also affected. |
| </li> |
| <li> |
| As usual, neighboring registers might get undefined, if vA (and vA+1) were |
| part of a register pair originally. |
| </li> |
| </ul> |
| |
| <h2>Exceptions</h2> |
| |
| <ul> |
| <li> |
| ArithmeticException if an error occurs during the instruction. |
| </li> |
| </ul> |
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