| <html lang="en"> |
| <head> |
| <title>V850 Options - Using the GNU Compiler Collection (GCC)</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="Using the GNU Compiler Collection (GCC)"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="up" href="Submodel-Options.html#Submodel-Options" title="Submodel Options"> |
| <link rel="prev" href="TILEPro-Options.html#TILEPro-Options" title="TILEPro Options"> |
| <link rel="next" href="VAX-Options.html#VAX-Options" title="VAX Options"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1988-2013 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 or |
| any later version published by the Free Software Foundation; with the |
| Invariant Sections being ``Funding Free Software'', the Front-Cover |
| Texts being (a) (see below), and with the Back-Cover Texts being (b) |
| (see below). A copy of the license is included in the section entitled |
| ``GNU Free Documentation License''. |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development.--> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="V850-Options"></a> |
| <p> |
| Next: <a rel="next" accesskey="n" href="VAX-Options.html#VAX-Options">VAX Options</a>, |
| Previous: <a rel="previous" accesskey="p" href="TILEPro-Options.html#TILEPro-Options">TILEPro Options</a>, |
| Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel-Options">Submodel Options</a> |
| <hr> |
| </div> |
| |
| <h4 class="subsection">3.17.45 V850 Options</h4> |
| |
| <p><a name="index-V850-Options-2254"></a> |
| These ‘<samp><span class="samp">-m</span></samp>’ options are defined for V850 implementations: |
| |
| <dl> |
| <dt><code>-mlong-calls</code><dt><code>-mno-long-calls</code><dd><a name="index-mlong_002dcalls-2255"></a><a name="index-mno_002dlong_002dcalls-2256"></a>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. |
| |
| <br><dt><code>-mno-ep</code><dt><code>-mep</code><dd><a name="index-mno_002dep-2257"></a><a name="index-mep-2258"></a>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><span class="option">-mep</span></samp> |
| option is on by default if you optimize. |
| |
| <br><dt><code>-mno-prolog-function</code><dt><code>-mprolog-function</code><dd><a name="index-mno_002dprolog_002dfunction-2259"></a><a name="index-mprolog_002dfunction-2260"></a>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><span class="option">-mprolog-function</span></samp> option |
| is on by default if you optimize. |
| |
| <br><dt><code>-mspace</code><dd><a name="index-mspace-2261"></a>Try to make the code as small as possible. At present, this just turns |
| on the <samp><span class="option">-mep</span></samp> and <samp><span class="option">-mprolog-function</span></samp> options. |
| |
| <br><dt><code>-mtda=</code><var>n</var><dd><a name="index-mtda-2262"></a>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). |
| |
| <br><dt><code>-msda=</code><var>n</var><dd><a name="index-msda-2263"></a>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. |
| |
| <br><dt><code>-mzda=</code><var>n</var><dd><a name="index-mzda-2264"></a>Put static or global variables whose size is <var>n</var> bytes or less into |
| the first 32 kilobytes of memory. |
| |
| <br><dt><code>-mv850</code><dd><a name="index-mv850-2265"></a>Specify that the target processor is the V850. |
| |
| <br><dt><code>-mv850e3v5</code><dd><a name="index-mv850e3v5-2266"></a>Specify that the target processor is the V850E3V5. The preprocessor |
| constant ‘<samp><span class="samp">__v850e3v5__</span></samp>’ is defined if this option is used. |
| |
| <br><dt><code>-mv850e2v4</code><dd><a name="index-mv850e2v4-2267"></a>Specify that the target processor is the V850E3V5. This is an alias for |
| the <samp><span class="option">-mv850e3v5</span></samp> option. |
| |
| <br><dt><code>-mv850e2v3</code><dd><a name="index-mv850e2v3-2268"></a>Specify that the target processor is the V850E2V3. The preprocessor |
| constant ‘<samp><span class="samp">__v850e2v3__</span></samp>’ is defined if this option is used. |
| |
| <br><dt><code>-mv850e2</code><dd><a name="index-mv850e2-2269"></a>Specify that the target processor is the V850E2. The preprocessor |
| constant ‘<samp><span class="samp">__v850e2__</span></samp>’ is defined if this option is used. |
| |
| <br><dt><code>-mv850e1</code><dd><a name="index-mv850e1-2270"></a>Specify that the target processor is the V850E1. The preprocessor |
| constants ‘<samp><span class="samp">__v850e1__</span></samp>’ and ‘<samp><span class="samp">__v850e__</span></samp>’ are defined if |
| this option is used. |
| |
| <br><dt><code>-mv850es</code><dd><a name="index-mv850es-2271"></a>Specify that the target processor is the V850ES. This is an alias for |
| the <samp><span class="option">-mv850e1</span></samp> option. |
| |
| <br><dt><code>-mv850e</code><dd><a name="index-mv850e-2272"></a>Specify that the target processor is the V850E. The preprocessor |
| constant ‘<samp><span class="samp">__v850e__</span></samp>’ is defined if this option is used. |
| |
| <p>If neither <samp><span class="option">-mv850</span></samp> nor <samp><span class="option">-mv850e</span></samp> nor <samp><span class="option">-mv850e1</span></samp> |
| nor <samp><span class="option">-mv850e2</span></samp> nor <samp><span class="option">-mv850e2v3</span></samp> nor <samp><span class="option">-mv850e3v5</span></samp> |
| are defined then a default target processor is chosen and the |
| relevant ‘<samp><span class="samp">__v850*__</span></samp>’ preprocessor constant is defined. |
| |
| <p>The preprocessor constants ‘<samp><span class="samp">__v850</span></samp>’ and ‘<samp><span class="samp">__v851__</span></samp>’ are always |
| defined, regardless of which processor variant is the target. |
| |
| <br><dt><code>-mdisable-callt</code><dt><code>-mno-disable-callt</code><dd><a name="index-mdisable_002dcallt-2273"></a><a name="index-mno_002ddisable_002dcallt-2274"></a>This option suppresses generation of the <code>CALLT</code> instruction for the |
| v850e, v850e1, v850e2, v850e2v3 and v850e3v5 flavors of the v850 |
| architecture. |
| |
| <p>This option is enabled by default when the RH850 ABI is |
| in use (see <samp><span class="option">-mrh850-abi</span></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. |
| |
| <br><dt><code>-mrelax</code><dt><code>-mno-relax</code><dd><a name="index-mrelax-2275"></a><a name="index-mno_002drelax-2276"></a>Pass on (or do not pass on) the <samp><span class="option">-mrelax</span></samp> command line option |
| to the assembler. |
| |
| <br><dt><code>-mlong-jumps</code><dt><code>-mno-long-jumps</code><dd><a name="index-mlong_002djumps-2277"></a><a name="index-mno_002dlong_002djumps-2278"></a>Disable (or re-enable) the generation of PC-relative jump instructions. |
| |
| <br><dt><code>-msoft-float</code><dt><code>-mhard-float</code><dd><a name="index-msoft_002dfloat-2279"></a><a name="index-mhard_002dfloat-2280"></a>Disable (or re-enable) the generation of hardware floating point |
| instructions. This option is only significant when the target |
| architecture is ‘<samp><span class="samp">V850E2V3</span></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. |
| |
| <br><dt><code>-mloop</code><dd><a name="index-mloop-2281"></a>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. |
| |
| <br><dt><code>-mrh850-abi</code><dt><code>-mghs</code><dd><a name="index-mrh850_002dabi-2282"></a><a name="index-mghs-2283"></a>Enables support for the RH850 version of the V850 ABI. This is the |
| default. With this version of the ABI the following rules apply: |
| |
| <ul> |
| <li>Integer sized structures and unions are returned via a memory pointer |
| rather than a register. |
| |
| <li>Large structures and unions (more than 8 bytes in size) are passed by |
| value. |
| |
| <li>Functions are aligned to 16-bit boundaries. |
| |
| <li>The <samp><span class="option">-m8byte-align</span></samp> command line option is supported. |
| |
| <li>The <samp><span class="option">-mdisable-callt</span></samp> command line option is enabled by |
| default. The <samp><span class="option">-mno-disable-callt</span></samp> command line option is not |
| supported. |
| </ul> |
| |
| <p>When this version of the ABI is enabled the C preprocessor symbol |
| <code>__V850_RH850_ABI__</code> is defined. |
| |
| <br><dt><code>-mgcc-abi</code><dd><a name="index-mgcc_002dabi-2284"></a>Enables support for the old GCC version of the V850 ABI. With this |
| version of the ABI the following rules apply: |
| |
| <ul> |
| <li>Integer sized structures and unions are returned in register <code>r10</code>. |
| |
| <li>Large structures and unions (more than 8 bytes in size) are passed by |
| reference. |
| |
| <li>Functions are aligned to 32-bit boundaries, unless optimizing for |
| size. |
| |
| <li>The <samp><span class="option">-m8byte-align</span></samp> command line option is not supported. |
| |
| <li>The <samp><span class="option">-mdisable-callt</span></samp> command line option is supported but not |
| enabled by default. |
| </ul> |
| |
| <p>When this version of the ABI is enabled the C preprocessor symbol |
| <code>__V850_GCC_ABI__</code> is defined. |
| |
| <br><dt><code>-m8byte-align</code><dt><code>-mno-8byte-align</code><dd><a name="index-m8byte_002dalign-2285"></a><a name="index-mno_002d8byte_002dalign-2286"></a>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><span class="option">-m8byte-align</span></samp> is in effect the C preprocessor symbol |
| <code>__V850_8BYTE_ALIGN__</code> will be defined. |
| |
| <br><dt><code>-mbig-switch</code><dd><a name="index-mbig_002dswitch-2287"></a>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. |
| |
| <br><dt><code>-mapp-regs</code><dd><a name="index-mapp_002dregs-2288"></a>This option causes r2 and r5 to be used in the code generated by |
| the compiler. This setting is the default. |
| |
| <br><dt><code>-mno-app-regs</code><dd><a name="index-mno_002dapp_002dregs-2289"></a>This option causes r2 and r5 to be treated as fixed registers. |
| |
| </dl> |
| |
| </body></html> |
| |
