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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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| <a name="V850-Options-1"></a> |
| <h4 class="subsection">3.17.49 V850 Options</h4> |
| <a name="index-V850-Options"></a> |
| |
| <p>These ‘<samp>-m</samp>’ options are defined for V850 implementations: |
| </p> |
| <dl compact="compact"> |
| <dt><code>-mlong-calls</code></dt> |
| <dt><code>-mno-long-calls</code></dt> |
| <dd><a name="index-mlong_002dcalls-6"></a> |
| <a name="index-mno_002dlong_002dcalls-4"></a> |
| <p>Treat all calls as being far away (near). If calls are assumed to be |
| far away, the compiler always loads the function’s address into a |
| register, and calls indirect through the pointer. |
| </p> |
| </dd> |
| <dt><code>-mno-ep</code></dt> |
| <dt><code>-mep</code></dt> |
| <dd><a name="index-mno_002dep"></a> |
| <a name="index-mep"></a> |
| <p>Do not optimize (do optimize) basic blocks that use the same index |
| pointer 4 or more times to copy pointer into the <code>ep</code> register, and |
| use the shorter <code>sld</code> and <code>sst</code> instructions. The <samp>-mep</samp> |
| option is on by default if you optimize. |
| </p> |
| </dd> |
| <dt><code>-mno-prolog-function</code></dt> |
| <dt><code>-mprolog-function</code></dt> |
| <dd><a name="index-mno_002dprolog_002dfunction"></a> |
| <a name="index-mprolog_002dfunction"></a> |
| <p>Do not use (do use) external functions to save and restore registers |
| at the prologue and epilogue of a function. The external functions |
| are slower, but use less code space if more than one function saves |
| the same number of registers. The <samp>-mprolog-function</samp> option |
| is on by default if you optimize. |
| </p> |
| </dd> |
| <dt><code>-mspace</code></dt> |
| <dd><a name="index-mspace"></a> |
| <p>Try to make the code as small as possible. At present, this just turns |
| on the <samp>-mep</samp> and <samp>-mprolog-function</samp> options. |
| </p> |
| </dd> |
| <dt><code>-mtda=<var>n</var></code></dt> |
| <dd><a name="index-mtda"></a> |
| <p>Put static or global variables whose size is <var>n</var> bytes or less into |
| the tiny data area that register <code>ep</code> points to. The tiny data |
| area can hold up to 256 bytes in total (128 bytes for byte references). |
| </p> |
| </dd> |
| <dt><code>-msda=<var>n</var></code></dt> |
| <dd><a name="index-msda"></a> |
| <p>Put static or global variables whose size is <var>n</var> bytes or less into |
| the small data area that register <code>gp</code> points to. The small data |
| area can hold up to 64 kilobytes. |
| </p> |
| </dd> |
| <dt><code>-mzda=<var>n</var></code></dt> |
| <dd><a name="index-mzda"></a> |
| <p>Put static or global variables whose size is <var>n</var> bytes or less into |
| the first 32 kilobytes of memory. |
| </p> |
| </dd> |
| <dt><code>-mv850</code></dt> |
| <dd><a name="index-mv850"></a> |
| <p>Specify that the target processor is the V850. |
| </p> |
| </dd> |
| <dt><code>-mv850e3v5</code></dt> |
| <dd><a name="index-mv850e3v5"></a> |
| <p>Specify that the target processor is the V850E3V5. The preprocessor |
| constant ‘<samp>__v850e3v5__</samp>’ is defined if this option is used. |
| </p> |
| </dd> |
| <dt><code>-mv850e2v4</code></dt> |
| <dd><a name="index-mv850e2v4"></a> |
| <p>Specify that the target processor is the V850E3V5. This is an alias for |
| the <samp>-mv850e3v5</samp> option. |
| </p> |
| </dd> |
| <dt><code>-mv850e2v3</code></dt> |
| <dd><a name="index-mv850e2v3"></a> |
| <p>Specify that the target processor is the V850E2V3. The preprocessor |
| constant ‘<samp>__v850e2v3__</samp>’ is defined if this option is used. |
| </p> |
| </dd> |
| <dt><code>-mv850e2</code></dt> |
| <dd><a name="index-mv850e2"></a> |
| <p>Specify that the target processor is the V850E2. The preprocessor |
| constant ‘<samp>__v850e2__</samp>’ is defined if this option is used. |
| </p> |
| </dd> |
| <dt><code>-mv850e1</code></dt> |
| <dd><a name="index-mv850e1"></a> |
| <p>Specify that the target processor is the V850E1. The preprocessor |
| constants ‘<samp>__v850e1__</samp>’ and ‘<samp>__v850e__</samp>’ are defined if |
| this option is used. |
| </p> |
| </dd> |
| <dt><code>-mv850es</code></dt> |
| <dd><a name="index-mv850es"></a> |
| <p>Specify that the target processor is the V850ES. This is an alias for |
| the <samp>-mv850e1</samp> option. |
| </p> |
| </dd> |
| <dt><code>-mv850e</code></dt> |
| <dd><a name="index-mv850e"></a> |
| <p>Specify that the target processor is the V850E. The preprocessor |
| constant ‘<samp>__v850e__</samp>’ is defined if this option is used. |
| </p> |
| <p>If neither <samp>-mv850</samp> nor <samp>-mv850e</samp> nor <samp>-mv850e1</samp> |
| nor <samp>-mv850e2</samp> nor <samp>-mv850e2v3</samp> nor <samp>-mv850e3v5</samp> |
| are defined then a default target processor is chosen and the |
| relevant ‘<samp>__v850*__</samp>’ preprocessor constant is defined. |
| </p> |
| <p>The preprocessor constants ‘<samp>__v850</samp>’ and ‘<samp>__v851__</samp>’ are always |
| defined, regardless of which processor variant is the target. |
| </p> |
| </dd> |
| <dt><code>-mdisable-callt</code></dt> |
| <dt><code>-mno-disable-callt</code></dt> |
| <dd><a name="index-mdisable_002dcallt"></a> |
| <a name="index-mno_002ddisable_002dcallt"></a> |
| <p>This option suppresses generation of the <code>CALLT</code> instruction for the |
| v850e, v850e1, v850e2, v850e2v3 and v850e3v5 flavors of the v850 |
| architecture. |
| </p> |
| <p>This option is enabled by default when the RH850 ABI is |
| in use (see <samp>-mrh850-abi</samp>), and disabled by default when the |
| GCC ABI is in use. If <code>CALLT</code> instructions are being generated |
| then the C preprocessor symbol <code>__V850_CALLT__</code> will be defined. |
| </p> |
| </dd> |
| <dt><code>-mrelax</code></dt> |
| <dt><code>-mno-relax</code></dt> |
| <dd><a name="index-mrelax-7"></a> |
| <a name="index-mno_002drelax"></a> |
| <p>Pass on (or do not pass on) the <samp>-mrelax</samp> command line option |
| to the assembler. |
| </p> |
| </dd> |
| <dt><code>-mlong-jumps</code></dt> |
| <dt><code>-mno-long-jumps</code></dt> |
| <dd><a name="index-mlong_002djumps"></a> |
| <a name="index-mno_002dlong_002djumps"></a> |
| <p>Disable (or re-enable) the generation of PC-relative jump instructions. |
| </p> |
| </dd> |
| <dt><code>-msoft-float</code></dt> |
| <dt><code>-mhard-float</code></dt> |
| <dd><a name="index-msoft_002dfloat-12"></a> |
| <a name="index-mhard_002dfloat-7"></a> |
| <p>Disable (or re-enable) the generation of hardware floating point |
| instructions. This option is only significant when the target |
| architecture is ‘<samp>V850E2V3</samp>’ or higher. If hardware floating point |
| instructions are being generated then the C preprocessor symbol |
| <code>__FPU_OK__</code> will be defined, otherwise the symbol |
| <code>__NO_FPU__</code> will be defined. |
| </p> |
| </dd> |
| <dt><code>-mloop</code></dt> |
| <dd><a name="index-mloop"></a> |
| <p>Enables the use of the e3v5 LOOP instruction. The use of this |
| instruction is not enabled by default when the e3v5 architecture is |
| selected because its use is still experimental. |
| </p> |
| </dd> |
| <dt><code>-mrh850-abi</code></dt> |
| <dt><code>-mghs</code></dt> |
| <dd><a name="index-mrh850_002dabi"></a> |
| <a name="index-mghs"></a> |
| <p>Enables support for the RH850 version of the V850 ABI. This is the |
| default. With this version of the ABI the following rules apply: |
| </p> |
| <ul> |
| <li> Integer sized structures and unions are returned via a memory pointer |
| rather than a register. |
| |
| </li><li> Large structures and unions (more than 8 bytes in size) are passed by |
| value. |
| |
| </li><li> Functions are aligned to 16-bit boundaries. |
| |
| </li><li> The <samp>-m8byte-align</samp> command line option is supported. |
| |
| </li><li> The <samp>-mdisable-callt</samp> command line option is enabled by |
| default. The <samp>-mno-disable-callt</samp> command line option is not |
| supported. |
| </li></ul> |
| |
| <p>When this version of the ABI is enabled the C preprocessor symbol |
| <code>__V850_RH850_ABI__</code> is defined. |
| </p> |
| </dd> |
| <dt><code>-mgcc-abi</code></dt> |
| <dd><a name="index-mgcc_002dabi"></a> |
| <p>Enables support for the old GCC version of the V850 ABI. With this |
| version of the ABI the following rules apply: |
| </p> |
| <ul> |
| <li> Integer sized structures and unions are returned in register <code>r10</code>. |
| |
| </li><li> Large structures and unions (more than 8 bytes in size) are passed by |
| reference. |
| |
| </li><li> Functions are aligned to 32-bit boundaries, unless optimizing for |
| size. |
| |
| </li><li> The <samp>-m8byte-align</samp> command line option is not supported. |
| |
| </li><li> The <samp>-mdisable-callt</samp> command line option is supported but not |
| enabled by default. |
| </li></ul> |
| |
| <p>When this version of the ABI is enabled the C preprocessor symbol |
| <code>__V850_GCC_ABI__</code> is defined. |
| </p> |
| </dd> |
| <dt><code>-m8byte-align</code></dt> |
| <dt><code>-mno-8byte-align</code></dt> |
| <dd><a name="index-m8byte_002dalign"></a> |
| <a name="index-mno_002d8byte_002dalign"></a> |
| <p>Enables support for <code>doubles</code> and <code>long long</code> types to be |
| aligned on 8-byte boundaries. The default is to restrict the |
| alignment of all objects to at most 4-bytes. When |
| <samp>-m8byte-align</samp> is in effect the C preprocessor symbol |
| <code>__V850_8BYTE_ALIGN__</code> will be defined. |
| </p> |
| </dd> |
| <dt><code>-mbig-switch</code></dt> |
| <dd><a name="index-mbig_002dswitch"></a> |
| <p>Generate code suitable for big switch tables. Use this option only if |
| the assembler/linker complain about out of range branches within a switch |
| table. |
| </p> |
| </dd> |
| <dt><code>-mapp-regs</code></dt> |
| <dd><a name="index-mapp_002dregs-1"></a> |
| <p>This option causes r2 and r5 to be used in the code generated by |
| the compiler. This setting is the default. |
| </p> |
| </dd> |
| <dt><code>-mno-app-regs</code></dt> |
| <dd><a name="index-mno_002dapp_002dregs-1"></a> |
| <p>This option causes r2 and r5 to be treated as fixed registers. |
| </p> |
| </dd> |
| </dl> |
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