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ePenguin-Software-Framework/toolchains/riscv/share/doc/as.html/D30V_002dRegs.html

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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<title>D30V-Regs (Using as)</title>
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<a name="D30V_002dRegs"></a>
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<p>
Next: <a href="D30V_002dAddressing.html#D30V_002dAddressing" accesskey="n" rel="next">D30V-Addressing</a>, Previous: <a href="D30V_002dGuarded.html#D30V_002dGuarded" accesskey="p" rel="prev">D30V-Guarded</a>, Up: <a href="D30V_002dSyntax.html#D30V_002dSyntax" accesskey="u" rel="up">D30V-Syntax</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
<a name="Register-Names-6"></a>
<h4 class="subsubsection">9.11.2.5 Register Names</h4>
<a name="index-D30V-registers"></a>
<a name="index-registers_002c-D30V"></a>
<p>You can use the predefined symbols &lsquo;<samp>r0</samp>&rsquo; through &lsquo;<samp>r63</samp>&rsquo; to refer
to the D30V registers. You can also use &lsquo;<samp>sp</samp>&rsquo; as an alias for
&lsquo;<samp>r63</samp>&rsquo; and &lsquo;<samp>link</samp>&rsquo; as an alias for &lsquo;<samp>r62</samp>&rsquo;. The accumulators
are &lsquo;<samp>a0</samp>&rsquo; and &lsquo;<samp>a1</samp>&rsquo;.
</p>
<p>The D30V also has predefined symbols for these control registers and status bits:
</p><dl compact="compact">
<dt><code>psw</code></dt>
<dd><p>Processor Status Word
</p></dd>
<dt><code>bpsw</code></dt>
<dd><p>Backup Processor Status Word
</p></dd>
<dt><code>pc</code></dt>
<dd><p>Program Counter
</p></dd>
<dt><code>bpc</code></dt>
<dd><p>Backup Program Counter
</p></dd>
<dt><code>rpt_c</code></dt>
<dd><p>Repeat Count
</p></dd>
<dt><code>rpt_s</code></dt>
<dd><p>Repeat Start address
</p></dd>
<dt><code>rpt_e</code></dt>
<dd><p>Repeat End address
</p></dd>
<dt><code>mod_s</code></dt>
<dd><p>Modulo Start address
</p></dd>
<dt><code>mod_e</code></dt>
<dd><p>Modulo End address
</p></dd>
<dt><code>iba</code></dt>
<dd><p>Instruction Break Address
</p></dd>
<dt><code>f0</code></dt>
<dd><p>Flag 0
</p></dd>
<dt><code>f1</code></dt>
<dd><p>Flag 1
</p></dd>
<dt><code>f2</code></dt>
<dd><p>Flag 2
</p></dd>
<dt><code>f3</code></dt>
<dd><p>Flag 3
</p></dd>
<dt><code>f4</code></dt>
<dd><p>Flag 4
</p></dd>
<dt><code>f5</code></dt>
<dd><p>Flag 5
</p></dd>
<dt><code>f6</code></dt>
<dd><p>Flag 6
</p></dd>
<dt><code>f7</code></dt>
<dd><p>Flag 7
</p></dd>
<dt><code>s</code></dt>
<dd><p>Same as flag 4 (saturation flag)
</p></dd>
<dt><code>v</code></dt>
<dd><p>Same as flag 5 (overflow flag)
</p></dd>
<dt><code>va</code></dt>
<dd><p>Same as flag 6 (sticky overflow flag)
</p></dd>
<dt><code>c</code></dt>
<dd><p>Same as flag 7 (carry/borrow flag)
</p></dd>
<dt><code>b</code></dt>
<dd><p>Same as flag 7 (carry/borrow flag)
</p></dd>
</dl>
</body>
</html>