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<title>Using the GNU Compiler Collection (GCC): V850 Options</title>
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<a name="V850-Options"></a>
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<div class="header">
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<p>
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Next: <a href="VAX-Options.html#VAX-Options" accesskey="n" rel="next">VAX Options</a>, Previous: <a href="TILEPro-Options.html#TILEPro-Options" accesskey="p" rel="prev">TILEPro 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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<hr>
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<a name="V850-Options-1"></a>
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<h4 class="subsection">3.18.49 V850 Options</h4>
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<a name="index-V850-Options"></a>
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<p>These ‘<samp>-m</samp>’ options are defined for V850 implementations:
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</p>
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<dl compact="compact">
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<dt><code>-mlong-calls</code></dt>
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<dt><code>-mno-long-calls</code></dt>
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<dd><a name="index-mlong_002dcalls-6"></a>
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<a name="index-mno_002dlong_002dcalls-4"></a>
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<p>Treat all calls as being far away (near). If calls are assumed to be
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far away, the compiler always loads the function’s address into a
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register, and calls indirect through the pointer.
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</p>
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</dd>
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<dt><code>-mno-ep</code></dt>
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<dt><code>-mep</code></dt>
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<dd><a name="index-mno_002dep"></a>
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<a name="index-mep"></a>
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<p>Do not optimize (do optimize) basic blocks that use the same index
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pointer 4 or more times to copy pointer into the <code>ep</code> register, and
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use the shorter <code>sld</code> and <code>sst</code> instructions. The <samp>-mep</samp>
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option is on by default if you optimize.
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</p>
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</dd>
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<dt><code>-mno-prolog-function</code></dt>
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<dt><code>-mprolog-function</code></dt>
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<dd><a name="index-mno_002dprolog_002dfunction"></a>
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<a name="index-mprolog_002dfunction"></a>
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<p>Do not use (do use) external functions to save and restore registers
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at the prologue and epilogue of a function. The external functions
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are slower, but use less code space if more than one function saves
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the same number of registers. The <samp>-mprolog-function</samp> option
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is on by default if you optimize.
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</p>
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</dd>
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<dt><code>-mspace</code></dt>
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<dd><a name="index-mspace"></a>
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<p>Try to make the code as small as possible. At present, this just turns
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on the <samp>-mep</samp> and <samp>-mprolog-function</samp> options.
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</p>
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</dd>
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<dt><code>-mtda=<var>n</var></code></dt>
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<dd><a name="index-mtda"></a>
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<p>Put static or global variables whose size is <var>n</var> bytes or less into
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the tiny data area that register <code>ep</code> points to. The tiny data
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area can hold up to 256 bytes in total (128 bytes for byte references).
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</p>
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</dd>
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<dt><code>-msda=<var>n</var></code></dt>
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<dd><a name="index-msda"></a>
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<p>Put static or global variables whose size is <var>n</var> bytes or less into
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the small data area that register <code>gp</code> points to. The small data
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area can hold up to 64 kilobytes.
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</p>
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</dd>
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<dt><code>-mzda=<var>n</var></code></dt>
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<dd><a name="index-mzda"></a>
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<p>Put static or global variables whose size is <var>n</var> bytes or less into
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the first 32 kilobytes of memory.
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</p>
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</dd>
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<dt><code>-mv850</code></dt>
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<dd><a name="index-mv850"></a>
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<p>Specify that the target processor is the V850.
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</p>
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</dd>
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<dt><code>-mv850e3v5</code></dt>
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<dd><a name="index-mv850e3v5"></a>
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<p>Specify that the target processor is the V850E3V5. The preprocessor
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constant <code>__v850e3v5__</code> is defined if this option is used.
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</p>
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</dd>
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<dt><code>-mv850e2v4</code></dt>
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<dd><a name="index-mv850e2v4"></a>
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<p>Specify that the target processor is the V850E3V5. This is an alias for
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the <samp>-mv850e3v5</samp> option.
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</p>
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</dd>
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<dt><code>-mv850e2v3</code></dt>
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<dd><a name="index-mv850e2v3"></a>
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<p>Specify that the target processor is the V850E2V3. The preprocessor
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constant <code>__v850e2v3__</code> is defined if this option is used.
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</p>
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</dd>
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<dt><code>-mv850e2</code></dt>
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<dd><a name="index-mv850e2"></a>
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<p>Specify that the target processor is the V850E2. The preprocessor
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constant <code>__v850e2__</code> is defined if this option is used.
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</p>
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</dd>
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<dt><code>-mv850e1</code></dt>
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<dd><a name="index-mv850e1"></a>
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<p>Specify that the target processor is the V850E1. The preprocessor
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constants <code>__v850e1__</code> and <code>__v850e__</code> are defined if
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this option is used.
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</p>
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</dd>
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<dt><code>-mv850es</code></dt>
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<dd><a name="index-mv850es"></a>
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<p>Specify that the target processor is the V850ES. This is an alias for
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the <samp>-mv850e1</samp> option.
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</p>
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</dd>
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<dt><code>-mv850e</code></dt>
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<dd><a name="index-mv850e"></a>
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<p>Specify that the target processor is the V850E. The preprocessor
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constant <code>__v850e__</code> is defined if this option is used.
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</p>
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<p>If neither <samp>-mv850</samp> nor <samp>-mv850e</samp> nor <samp>-mv850e1</samp>
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nor <samp>-mv850e2</samp> nor <samp>-mv850e2v3</samp> nor <samp>-mv850e3v5</samp>
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are defined then a default target processor is chosen and the
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relevant ‘<samp>__v850*__</samp>’ preprocessor constant is defined.
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</p>
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<p>The preprocessor constants <code>__v850</code> and <code>__v851__</code> are always
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defined, regardless of which processor variant is the target.
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</p>
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</dd>
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<dt><code>-mdisable-callt</code></dt>
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<dt><code>-mno-disable-callt</code></dt>
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<dd><a name="index-mdisable_002dcallt"></a>
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<a name="index-mno_002ddisable_002dcallt"></a>
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<p>This option suppresses generation of the <code>CALLT</code> instruction for the
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v850e, v850e1, v850e2, v850e2v3 and v850e3v5 flavors of the v850
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architecture.
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</p>
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<p>This option is enabled by default when the RH850 ABI is
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in use (see <samp>-mrh850-abi</samp>), and disabled by default when the
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GCC ABI is in use. If <code>CALLT</code> instructions are being generated
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then the C preprocessor symbol <code>__V850_CALLT__</code> is defined.
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</p>
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</dd>
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<dt><code>-mrelax</code></dt>
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<dt><code>-mno-relax</code></dt>
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<dd><a name="index-mrelax-7"></a>
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<a name="index-mno_002drelax"></a>
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<p>Pass on (or do not pass on) the <samp>-mrelax</samp> command-line option
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to the assembler.
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</p>
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</dd>
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<dt><code>-mlong-jumps</code></dt>
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<dt><code>-mno-long-jumps</code></dt>
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<dd><a name="index-mlong_002djumps"></a>
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<a name="index-mno_002dlong_002djumps"></a>
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<p>Disable (or re-enable) the generation of PC-relative jump instructions.
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</p>
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</dd>
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<dt><code>-msoft-float</code></dt>
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<dt><code>-mhard-float</code></dt>
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<dd><a name="index-msoft_002dfloat-11"></a>
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<a name="index-mhard_002dfloat-7"></a>
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<p>Disable (or re-enable) the generation of hardware floating point
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instructions. This option is only significant when the target
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architecture is ‘<samp>V850E2V3</samp>’ or higher. If hardware floating point
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instructions are being generated then the C preprocessor symbol
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<code>__FPU_OK__</code> is defined, otherwise the symbol
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<code>__NO_FPU__</code> is defined.
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</p>
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</dd>
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<dt><code>-mloop</code></dt>
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<dd><a name="index-mloop"></a>
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<p>Enables the use of the e3v5 LOOP instruction. The use of this
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instruction is not enabled by default when the e3v5 architecture is
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selected because its use is still experimental.
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</p>
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</dd>
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<dt><code>-mrh850-abi</code></dt>
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<dt><code>-mghs</code></dt>
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<dd><a name="index-mrh850_002dabi"></a>
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<a name="index-mghs"></a>
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<p>Enables support for the RH850 version of the V850 ABI. This is the
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default. With this version of the ABI the following rules apply:
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</p>
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<ul>
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<li> Integer sized structures and unions are returned via a memory pointer
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rather than a register.
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</li><li> Large structures and unions (more than 8 bytes in size) are passed by
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value.
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</li><li> Functions are aligned to 16-bit boundaries.
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</li><li> The <samp>-m8byte-align</samp> command-line option is supported.
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</li><li> The <samp>-mdisable-callt</samp> command-line option is enabled by
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default. The <samp>-mno-disable-callt</samp> command-line option is not
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supported.
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</li></ul>
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<p>When this version of the ABI is enabled the C preprocessor symbol
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<code>__V850_RH850_ABI__</code> is defined.
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</p>
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</dd>
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<dt><code>-mgcc-abi</code></dt>
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<dd><a name="index-mgcc_002dabi"></a>
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<p>Enables support for the old GCC version of the V850 ABI. With this
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version of the ABI the following rules apply:
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</p>
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<ul>
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<li> Integer sized structures and unions are returned in register <code>r10</code>.
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</li><li> Large structures and unions (more than 8 bytes in size) are passed by
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reference.
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</li><li> Functions are aligned to 32-bit boundaries, unless optimizing for
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size.
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</li><li> The <samp>-m8byte-align</samp> command-line option is not supported.
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</li><li> The <samp>-mdisable-callt</samp> command-line option is supported but not
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enabled by default.
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</li></ul>
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<p>When this version of the ABI is enabled the C preprocessor symbol
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<code>__V850_GCC_ABI__</code> is defined.
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</p>
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</dd>
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<dt><code>-m8byte-align</code></dt>
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<dt><code>-mno-8byte-align</code></dt>
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<dd><a name="index-m8byte_002dalign"></a>
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<a name="index-mno_002d8byte_002dalign"></a>
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<p>Enables support for <code>double</code> and <code>long long</code> types to be
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aligned on 8-byte boundaries. The default is to restrict the
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alignment of all objects to at most 4-bytes. When
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<samp>-m8byte-align</samp> is in effect the C preprocessor symbol
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<code>__V850_8BYTE_ALIGN__</code> is defined.
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</p>
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</dd>
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<dt><code>-mbig-switch</code></dt>
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<dd><a name="index-mbig_002dswitch"></a>
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<p>Generate code suitable for big switch tables. Use this option only if
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the assembler/linker complain about out of range branches within a switch
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table.
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</p>
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</dd>
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<dt><code>-mapp-regs</code></dt>
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<dd><a name="index-mapp_002dregs-1"></a>
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<p>This option causes r2 and r5 to be used in the code generated by
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the compiler. This setting is the default.
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</p>
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</dd>
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<dt><code>-mno-app-regs</code></dt>
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<dd><a name="index-mno_002dapp_002dregs-1"></a>
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<p>This option causes r2 and r5 to be treated as fixed registers.
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</p>
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</dd>
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</dl>
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