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<h4 class="subsection">V850 Options</h4>
<p>These <code>-m</code> options are defined for V850 implementations:
<dl>
<dt><code>-mlong-calls</code>
<dd><dt><code>-mno-long-calls</code>
<dd>Treat all calls as being far away (near). If calls are assumed to be
far away, the compiler will always load the functions address up into a
register, and call indirect through the pointer.
<br><dt><code>-mno-ep</code>
<dd><dt><code>-mep</code>
<dd>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 <code>-mep</code>
option is on by default if you optimize.
<br><dt><code>-mno-prolog-function</code>
<dd><dt><code>-mprolog-function</code>
<dd>Do not use (do use) external functions to save and restore registers at
the prolog and epilog 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 <code>-mprolog-function</code> option is on by default if
you optimize.
<br><dt><code>-mspace</code>
<dd>Try to make the code as small as possible. At present, this just turns
on the <code>-mep</code> and <code>-mprolog-function</code> options.
<br><dt><code>-mtda=</code><var>n</var><code></code>
<dd>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><code></code>
<dd>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><code></code>
<dd>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>Specify that the target processor is the V850.
<br><dt><code>-mbig-switch</code>
<dd>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>This option will cause 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>This option will cause r2 and r5 to be treated as fixed registers.
<br><dt><code>-mv850e</code>
<dd>Specify that the target processor is the V850E. The preprocessor
constant <code>__v850e__</code> will be defined if this option is used.
<p>If neither <code>-mv850</code> nor <code>-mv850e</code> are defined
then a default target processor will be chosen and the relevant
<code>__v850*__</code> preprocessor constant will be defined.
<p>The preprocessor constants <code>__v850</code> and <code>__v851__</code> are always
defined, regardless of which processor variant is the target.
<br><dt><code>-mdisable-callt</code>
<dd>This option will suppress generation of the CALLT instruction for the
v850e flavors of the v850 architecture. The default is
<code>-mno-disable-callt</code> which allows the CALLT instruction to be used.
</dl>
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