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| <h5 class="subsubsection">9.29.2.4 Assembler Extensions</h5> |
| |
| <p><a name="index-MSP430-Assembler-Extensions-1751"></a> |
| <dl> |
| <dt><code>@rN</code><dd>As destination operand being treated as ‘<samp><span class="samp">0(rn)</span></samp>’ |
| |
| <br><dt><code>0(rN)</code><dd>As source operand being treated as ‘<samp><span class="samp">@rn</span></samp>’ |
| |
| <br><dt><code>jCOND +N</code><dd>Skips next N bytes followed by jump instruction and equivalent to |
| ‘<samp><span class="samp">jCOND $+N+2</span></samp>’ |
| |
| </dl> |
| |
| <p>Also, there are some instructions, which cannot be found in other assemblers. |
| These are branch instructions, which has different opcodes upon jump distance. |
| They all got PC relative addressing mode. |
| |
| <dl> |
| <dt><code>beq label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jeq label</span></samp>’ in case if jump distance |
| within allowed range for cpu's jump instruction. If not, this unrolls into |
| a sequence of |
| <pre class="smallexample"> jne $+6 |
| br label |
| </pre> |
| <br><dt><code>bne label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jne label</span></samp>’ or ‘<samp><span class="samp">jeq +4; br label</span></samp>’ |
| |
| <br><dt><code>blt label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jl label</span></samp>’ or ‘<samp><span class="samp">jge +4; br label</span></samp>’ |
| |
| <br><dt><code>bltn label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jn label</span></samp>’ or ‘<samp><span class="samp">jn +2; jmp +4; br label</span></samp>’ |
| |
| <br><dt><code>bltu label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jlo label</span></samp>’ or ‘<samp><span class="samp">jhs +2; br label</span></samp>’ |
| |
| <br><dt><code>bge label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jge label</span></samp>’ or ‘<samp><span class="samp">jl +4; br label</span></samp>’ |
| |
| <br><dt><code>bgeu label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jhs label</span></samp>’ or ‘<samp><span class="samp">jlo +4; br label</span></samp>’ |
| |
| <br><dt><code>bgt label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jeq +2; jge label</span></samp>’ or ‘<samp><span class="samp">jeq +6; jl +4; br label</span></samp>’ |
| |
| <br><dt><code>bgtu label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jeq +2; jhs label</span></samp>’ or ‘<samp><span class="samp">jeq +6; jlo +4; br label</span></samp>’ |
| |
| <br><dt><code>bleu label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jeq label; jlo label</span></samp>’ or ‘<samp><span class="samp">jeq +2; jhs +4; br label</span></samp>’ |
| |
| <br><dt><code>ble label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jeq label; jl label</span></samp>’ or ‘<samp><span class="samp">jeq +2; jge +4; br label</span></samp>’ |
| |
| <br><dt><code>jump label</code><dd>A polymorph instruction which is ‘<samp><span class="samp">jmp label</span></samp>’ or ‘<samp><span class="samp">br label</span></samp>’ |
| </dl> |
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