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<title>Using the GNU Compiler Collection (GCC): PDP-11 Options</title>
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<a name="PDP_002d11-Options"></a>
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<div class="header">
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<p>
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Next: <a href="picoChip-Options.html#picoChip-Options" accesskey="n" rel="next">picoChip Options</a>, Previous: <a href="Nvidia-PTX-Options.html#Nvidia-PTX-Options" accesskey="p" rel="prev">Nvidia PTX Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="PDP_002d11-Options-1"></a>
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<h4 class="subsection">3.18.34 PDP-11 Options</h4>
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<a name="index-PDP_002d11-Options"></a>
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<p>These options are defined for the PDP-11:
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</p>
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<dl compact="compact">
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<dt><code>-mfpu</code></dt>
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<dd><a name="index-mfpu-2"></a>
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<p>Use hardware FPP floating point. This is the default. (FIS floating
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point on the PDP-11/40 is not supported.)
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</p>
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</dd>
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<dt><code>-msoft-float</code></dt>
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<dd><a name="index-msoft_002dfloat-7"></a>
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<p>Do not use hardware floating point.
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</p>
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</dd>
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<dt><code>-mac0</code></dt>
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<dd><a name="index-mac0"></a>
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<p>Return floating-point results in ac0 (fr0 in Unix assembler syntax).
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</p>
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</dd>
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<dt><code>-mno-ac0</code></dt>
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<dd><a name="index-mno_002dac0"></a>
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<p>Return floating-point results in memory. This is the default.
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</p>
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</dd>
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<dt><code>-m40</code></dt>
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<dd><a name="index-m40"></a>
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<p>Generate code for a PDP-11/40.
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</p>
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</dd>
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<dt><code>-m45</code></dt>
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<dd><a name="index-m45"></a>
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<p>Generate code for a PDP-11/45. This is the default.
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</p>
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</dd>
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<dt><code>-m10</code></dt>
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<dd><a name="index-m10"></a>
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<p>Generate code for a PDP-11/10.
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</p>
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</dd>
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<dt><code>-mbcopy-builtin</code></dt>
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<dd><a name="index-mbcopy_002dbuiltin"></a>
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<p>Use inline <code>movmemhi</code> patterns for copying memory. This is the
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default.
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</p>
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</dd>
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<dt><code>-mbcopy</code></dt>
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<dd><a name="index-mbcopy"></a>
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<p>Do not use inline <code>movmemhi</code> patterns for copying memory.
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</p>
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</dd>
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<dt><code>-mint16</code></dt>
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<dt><code>-mno-int32</code></dt>
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<dd><a name="index-mint16"></a>
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<a name="index-mno_002dint32"></a>
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<p>Use 16-bit <code>int</code>. This is the default.
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</p>
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</dd>
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<dt><code>-mint32</code></dt>
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<dt><code>-mno-int16</code></dt>
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<dd><a name="index-mint32-2"></a>
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<a name="index-mno_002dint16"></a>
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<p>Use 32-bit <code>int</code>.
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</p>
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</dd>
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<dt><code>-mfloat64</code></dt>
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<dt><code>-mno-float32</code></dt>
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<dd><a name="index-mfloat64"></a>
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<a name="index-mno_002dfloat32"></a>
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<p>Use 64-bit <code>float</code>. This is the default.
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</p>
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</dd>
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<dt><code>-mfloat32</code></dt>
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<dt><code>-mno-float64</code></dt>
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<dd><a name="index-mfloat32"></a>
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<a name="index-mno_002dfloat64"></a>
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<p>Use 32-bit <code>float</code>.
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</p>
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</dd>
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<dt><code>-mabshi</code></dt>
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<dd><a name="index-mabshi"></a>
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<p>Use <code>abshi2</code> pattern. This is the default.
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</p>
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</dd>
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<dt><code>-mno-abshi</code></dt>
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<dd><a name="index-mno_002dabshi"></a>
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<p>Do not use <code>abshi2</code> pattern.
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</p>
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</dd>
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<dt><code>-mbranch-expensive</code></dt>
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<dd><a name="index-mbranch_002dexpensive"></a>
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<p>Pretend that branches are expensive. This is for experimenting with
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code generation only.
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</p>
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</dd>
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<dt><code>-mbranch-cheap</code></dt>
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<dd><a name="index-mbranch_002dcheap"></a>
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<p>Do not pretend that branches are expensive. This is the default.
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</p>
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</dd>
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<dt><code>-munix-asm</code></dt>
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<dd><a name="index-munix_002dasm"></a>
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<p>Use Unix assembler syntax. This is the default when configured for
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‘<samp>pdp11-*-bsd</samp>’.
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</p>
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</dd>
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<dt><code>-mdec-asm</code></dt>
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<dd><a name="index-mdec_002dasm"></a>
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<p>Use DEC assembler syntax. This is the default when configured for any
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PDP-11 target other than ‘<samp>pdp11-*-bsd</samp>’.
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</p></dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="picoChip-Options.html#picoChip-Options" accesskey="n" rel="next">picoChip Options</a>, Previous: <a href="Nvidia-PTX-Options.html#Nvidia-PTX-Options" accesskey="p" rel="prev">Nvidia PTX Options</a>, Up: <a href="Submodel-Options.html#Submodel-Options" accesskey="u" rel="up">Submodel Options</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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