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<h4 class="subsection">PDP-11 Options</h4>
<p>These options are defined for the PDP-11:
<dl>
<dt><code>-mfpu</code>
<dd>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>Do not use hardware floating point.
<br><dt><code>-mac0</code>
<dd>Return floating-point results in ac0 (fr0 in Unix assembler syntax).
<br><dt><code>-mno-ac0</code>
<dd>Return floating-point results in memory. This is the default.
<br><dt><code>-m40</code>
<dd>Generate code for a PDP-11/40.
<br><dt><code>-m45</code>
<dd>Generate code for a PDP-11/45. This is the default.
<br><dt><code>-m10</code>
<dd>Generate code for a PDP-11/10.
<br><dt><code>-mbcopy-builtin</code>
<dd>Use inline <code>movstrhi</code> patterns for copying memory. This is the
default.
<br><dt><code>-mbcopy</code>
<dd>Do not use inline <code>movstrhi</code> patterns for copying memory.
<br><dt><code>-mint16</code>
<dd><dt><code>-mno-int32</code>
<dd>Use 16-bit <code>int</code>. This is the default.
<br><dt><code>-mint32</code>
<dd><dt><code>-mno-int16</code>
<dd>Use 32-bit <code>int</code>.
<br><dt><code>-mfloat64</code>
<dd><dt><code>-mno-float32</code>
<dd>Use 64-bit <code>float</code>. This is the default.
<br><dt><code>-mfloat32</code>
<dd><br><dt><code>-mno-float64</code>
<dd>Use 32-bit <code>float</code>.
<br><dt><code>-mabshi</code>
<dd>Use <code>abshi2</code> pattern. This is the default.
<br><dt><code>-mno-abshi</code>
<dd>Do not use <code>abshi2</code> pattern.
<br><dt><code>-mbranch-expensive</code>
<dd>Pretend that branches are expensive. This is for experimenting with
code generation only.
<br><dt><code>-mbranch-cheap</code>
<dd>Do not pretend that branches are expensive. This is the default.
<br><dt><code>-msplit</code>
<dd>Generate code for a system with split I&D.
<br><dt><code>-mno-split</code>
<dd>Generate code for a system without split I&D. This is the default.
<br><dt><code>-munix-asm</code>
<dd>Use Unix assembler syntax. This is the default when configured for
<code>pdp11-*-bsd</code>.
<br><dt><code>-mdec-asm</code>
<dd>Use DEC assembler syntax. This is the default when configured for any
PDP-11 target other than <code>pdp11-*-bsd</code>.
</dl>
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