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| <h4 class="subsection">3.17.24 MeP Options</h4> |
| |
| <p><a name="index-MeP-options-1676"></a> |
| <dl> |
| <dt><code>-mabsdiff</code><dd><a name="index-mabsdiff-1677"></a>Enables the <code>abs</code> instruction, which is the absolute difference |
| between two registers. |
| |
| <br><dt><code>-mall-opts</code><dd><a name="index-mall_002dopts-1678"></a>Enables all the optional instructions—average, multiply, divide, bit |
| operations, leading zero, absolute difference, min/max, clip, and |
| saturation. |
| |
| <br><dt><code>-maverage</code><dd><a name="index-maverage-1679"></a>Enables the <code>ave</code> instruction, which computes the average of two |
| registers. |
| |
| <br><dt><code>-mbased=</code><var>n</var><dd><a name="index-mbased_003d-1680"></a>Variables of size <var>n</var> bytes or smaller are placed in the |
| <code>.based</code> section by default. Based variables use the <code>$tp</code> |
| register as a base register, and there is a 128-byte limit to the |
| <code>.based</code> section. |
| |
| <br><dt><code>-mbitops</code><dd><a name="index-mbitops-1681"></a>Enables the bit operation instructions—bit test (<code>btstm</code>), set |
| (<code>bsetm</code>), clear (<code>bclrm</code>), invert (<code>bnotm</code>), and |
| test-and-set (<code>tas</code>). |
| |
| <br><dt><code>-mc=</code><var>name</var><dd><a name="index-mc_003d-1682"></a>Selects which section constant data is placed in. <var>name</var> may |
| be <code>tiny</code>, <code>near</code>, or <code>far</code>. |
| |
| <br><dt><code>-mclip</code><dd><a name="index-mclip-1683"></a>Enables the <code>clip</code> instruction. Note that <code>-mclip</code> is not |
| useful unless you also provide <code>-mminmax</code>. |
| |
| <br><dt><code>-mconfig=</code><var>name</var><dd><a name="index-mconfig_003d-1684"></a>Selects one of the built-in core configurations. Each MeP chip has |
| one or more modules in it; each module has a core CPU and a variety of |
| coprocessors, optional instructions, and peripherals. The |
| <code>MeP-Integrator</code> tool, not part of GCC, provides these |
| configurations through this option; using this option is the same as |
| using all the corresponding command-line options. The default |
| configuration is <code>default</code>. |
| |
| <br><dt><code>-mcop</code><dd><a name="index-mcop-1685"></a>Enables the coprocessor instructions. By default, this is a 32-bit |
| coprocessor. Note that the coprocessor is normally enabled via the |
| <code>-mconfig=</code> option. |
| |
| <br><dt><code>-mcop32</code><dd><a name="index-mcop32-1686"></a>Enables the 32-bit coprocessor's instructions. |
| |
| <br><dt><code>-mcop64</code><dd><a name="index-mcop64-1687"></a>Enables the 64-bit coprocessor's instructions. |
| |
| <br><dt><code>-mivc2</code><dd><a name="index-mivc2-1688"></a>Enables IVC2 scheduling. IVC2 is a 64-bit VLIW coprocessor. |
| |
| <br><dt><code>-mdc</code><dd><a name="index-mdc-1689"></a>Causes constant variables to be placed in the <code>.near</code> section. |
| |
| <br><dt><code>-mdiv</code><dd><a name="index-mdiv-1690"></a>Enables the <code>div</code> and <code>divu</code> instructions. |
| |
| <br><dt><code>-meb</code><dd><a name="index-meb-1691"></a>Generate big-endian code. |
| |
| <br><dt><code>-mel</code><dd><a name="index-mel-1692"></a>Generate little-endian code. |
| |
| <br><dt><code>-mio-volatile</code><dd><a name="index-mio_002dvolatile-1693"></a>Tells the compiler that any variable marked with the <code>io</code> |
| attribute is to be considered volatile. |
| |
| <br><dt><code>-ml</code><dd><a name="index-ml-1694"></a>Causes variables to be assigned to the <code>.far</code> section by default. |
| |
| <br><dt><code>-mleadz</code><dd><a name="index-mleadz-1695"></a>Enables the <code>leadz</code> (leading zero) instruction. |
| |
| <br><dt><code>-mm</code><dd><a name="index-mm-1696"></a>Causes variables to be assigned to the <code>.near</code> section by default. |
| |
| <br><dt><code>-mminmax</code><dd><a name="index-mminmax-1697"></a>Enables the <code>min</code> and <code>max</code> instructions. |
| |
| <br><dt><code>-mmult</code><dd><a name="index-mmult-1698"></a>Enables the multiplication and multiply-accumulate instructions. |
| |
| <br><dt><code>-mno-opts</code><dd><a name="index-mno_002dopts-1699"></a>Disables all the optional instructions enabled by <code>-mall-opts</code>. |
| |
| <br><dt><code>-mrepeat</code><dd><a name="index-mrepeat-1700"></a>Enables the <code>repeat</code> and <code>erepeat</code> instructions, used for |
| low-overhead looping. |
| |
| <br><dt><code>-ms</code><dd><a name="index-ms-1701"></a>Causes all variables to default to the <code>.tiny</code> section. Note |
| that there is a 65536-byte limit to this section. Accesses to these |
| variables use the <code>%gp</code> base register. |
| |
| <br><dt><code>-msatur</code><dd><a name="index-msatur-1702"></a>Enables the saturation instructions. Note that the compiler does not |
| currently generate these itself, but this option is included for |
| compatibility with other tools, like <code>as</code>. |
| |
| <br><dt><code>-msdram</code><dd><a name="index-msdram-1703"></a>Link the SDRAM-based runtime instead of the default ROM-based runtime. |
| |
| <br><dt><code>-msim</code><dd><a name="index-msim-1704"></a>Link the simulator runtime libraries. |
| |
| <br><dt><code>-msimnovec</code><dd><a name="index-msimnovec-1705"></a>Link the simulator runtime libraries, excluding built-in support |
| for reset and exception vectors and tables. |
| |
| <br><dt><code>-mtf</code><dd><a name="index-mtf-1706"></a>Causes all functions to default to the <code>.far</code> section. Without |
| this option, functions default to the <code>.near</code> section. |
| |
| <br><dt><code>-mtiny=</code><var>n</var><dd><a name="index-mtiny_003d-1707"></a>Variables that are <var>n</var> bytes or smaller are allocated to the |
| <code>.tiny</code> section. These variables use the <code>$gp</code> base |
| register. The default for this option is 4, but note that there's a |
| 65536-byte limit to the <code>.tiny</code> section. |
| |
| </dl> |
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