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<h4 class="subsection">3.17.33 PDP-11 Options</h4>
<p><a name="index-PDP_002d11-Options-2167"></a>
These options are defined for the PDP-11:
<dl>
<dt><code>-mfpu</code><dd><a name="index-mfpu-2168"></a>Use hardware FPP floating point. This is the default. (FIS floating
point on the PDP-11/40 is not supported.)
<br><dt><code>-msoft-float</code><dd><a name="index-msoft_002dfloat-2169"></a>Do not use hardware floating point.
<br><dt><code>-mac0</code><dd><a name="index-mac0-2170"></a>Return floating-point results in ac0 (fr0 in Unix assembler syntax).
<br><dt><code>-mno-ac0</code><dd><a name="index-mno_002dac0-2171"></a>Return floating-point results in memory. This is the default.
<br><dt><code>-m40</code><dd><a name="index-m40-2172"></a>Generate code for a PDP-11/40.
<br><dt><code>-m45</code><dd><a name="index-m45-2173"></a>Generate code for a PDP-11/45. This is the default.
<br><dt><code>-m10</code><dd><a name="index-m10-2174"></a>Generate code for a PDP-11/10.
<br><dt><code>-mbcopy-builtin</code><dd><a name="index-mbcopy_002dbuiltin-2175"></a>Use inline <code>movmemhi</code> patterns for copying memory. This is the
default.
<br><dt><code>-mbcopy</code><dd><a name="index-mbcopy-2176"></a>Do not use inline <code>movmemhi</code> patterns for copying memory.
<br><dt><code>-mint16</code><dt><code>-mno-int32</code><dd><a name="index-mint16-2177"></a><a name="index-mno_002dint32-2178"></a>Use 16-bit <code>int</code>. This is the default.
<br><dt><code>-mint32</code><dt><code>-mno-int16</code><dd><a name="index-mint32-2179"></a><a name="index-mno_002dint16-2180"></a>Use 32-bit <code>int</code>.
<br><dt><code>-mfloat64</code><dt><code>-mno-float32</code><dd><a name="index-mfloat64-2181"></a><a name="index-mno_002dfloat32-2182"></a>Use 64-bit <code>float</code>. This is the default.
<br><dt><code>-mfloat32</code><dt><code>-mno-float64</code><dd><a name="index-mfloat32-2183"></a><a name="index-mno_002dfloat64-2184"></a>Use 32-bit <code>float</code>.
<br><dt><code>-mabshi</code><dd><a name="index-mabshi-2185"></a>Use <code>abshi2</code> pattern. This is the default.
<br><dt><code>-mno-abshi</code><dd><a name="index-mno_002dabshi-2186"></a>Do not use <code>abshi2</code> pattern.
<br><dt><code>-mbranch-expensive</code><dd><a name="index-mbranch_002dexpensive-2187"></a>Pretend that branches are expensive. This is for experimenting with
code generation only.
<br><dt><code>-mbranch-cheap</code><dd><a name="index-mbranch_002dcheap-2188"></a>Do not pretend that branches are expensive. This is the default.
<br><dt><code>-munix-asm</code><dd><a name="index-munix_002dasm-2189"></a>Use Unix assembler syntax. This is the default when configured for
‘<samp><span class="samp">pdp11-*-bsd</span></samp>’.
<br><dt><code>-mdec-asm</code><dd><a name="index-mdec_002dasm-2190"></a>Use DEC assembler syntax. This is the default when configured for any
PDP-11 target other than ‘<samp><span class="samp">pdp11-*-bsd</span></samp>’.
</dl>
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