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| <h4 class="subsection">3.17.28 PDP-11 Options</h4> |
| |
| <p><a name="index-PDP_002d11-Options-1704"></a> |
| These options are defined for the PDP-11: |
| |
| <dl> |
| <dt><code>-mfpu</code><dd><a name="index-mfpu-1705"></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-1706"></a>Do not use hardware floating point. |
| |
| <br><dt><code>-mac0</code><dd><a name="index-mac0-1707"></a>Return floating-point results in ac0 (fr0 in Unix assembler syntax). |
| |
| <br><dt><code>-mno-ac0</code><dd><a name="index-mno_002dac0-1708"></a>Return floating-point results in memory. This is the default. |
| |
| <br><dt><code>-m40</code><dd><a name="index-m40-1709"></a>Generate code for a PDP-11/40. |
| |
| <br><dt><code>-m45</code><dd><a name="index-m45-1710"></a>Generate code for a PDP-11/45. This is the default. |
| |
| <br><dt><code>-m10</code><dd><a name="index-m10-1711"></a>Generate code for a PDP-11/10. |
| |
| <br><dt><code>-mbcopy-builtin</code><dd><a name="index-mbcopy_002dbuiltin-1712"></a>Use inline <code>movmemhi</code> patterns for copying memory. This is the |
| default. |
| |
| <br><dt><code>-mbcopy</code><dd><a name="index-mbcopy-1713"></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-mint16-1714"></a><a name="index-mno_002dint32-1715"></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-mint32-1716"></a><a name="index-mno_002dint16-1717"></a>Use 32-bit <code>int</code>. |
| |
| <br><dt><code>-mfloat64</code><dt><code>-mno-float32</code><dd><a name="index-mfloat64-1718"></a><a name="index-mno_002dfloat32-1719"></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-mfloat32-1720"></a><a name="index-mno_002dfloat64-1721"></a>Use 32-bit <code>float</code>. |
| |
| <br><dt><code>-mabshi</code><dd><a name="index-mabshi-1722"></a>Use <code>abshi2</code> pattern. This is the default. |
| |
| <br><dt><code>-mno-abshi</code><dd><a name="index-mno_002dabshi-1723"></a>Do not use <code>abshi2</code> pattern. |
| |
| <br><dt><code>-mbranch-expensive</code><dd><a name="index-mbranch_002dexpensive-1724"></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-1725"></a>Do not pretend that branches are expensive. This is the default. |
| |
| <br><dt><code>-msplit</code><dd><a name="index-msplit-1726"></a>Generate code for a system with split I&D. |
| |
| <br><dt><code>-mno-split</code><dd><a name="index-mno_002dsplit-1727"></a>Generate code for a system without split I&D. This is the default. |
| |
| <br><dt><code>-munix-asm</code><dd><a name="index-munix_002dasm-1728"></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-1729"></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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