181 lines
7.9 KiB
HTML
181 lines
7.9 KiB
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<!-- Copyright (C) 1988-2016 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being "Funding Free Software", the Front-Cover
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Texts being (a) (see below), and with the Back-Cover Texts being (b)
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(see below). A copy of the license is included in the section entitled
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"GNU Free Documentation License".
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>Using the GNU Compiler Collection (GCC): RL78 Options</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): RL78 Options">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): RL78 Options">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Submodel-Options.html#Submodel-Options" rel="up" title="Submodel Options">
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<link href="RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options" rel="next" title="RS/6000 and PowerPC Options">
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<link href="PowerPC-Options.html#PowerPC-Options" rel="prev" title="PowerPC Options">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="RL78-Options"></a>
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<div class="header">
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<p>
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Next: <a href="RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options" accesskey="n" rel="next">RS/6000 and PowerPC Options</a>, Previous: <a href="PowerPC-Options.html#PowerPC-Options" accesskey="p" rel="prev">PowerPC 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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</div>
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<hr>
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<a name="RL78-Options-1"></a>
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<h4 class="subsection">3.18.37 RL78 Options</h4>
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<a name="index-RL78-Options"></a>
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<dl compact="compact">
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<dt><code>-msim</code></dt>
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<dd><a name="index-msim-7"></a>
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<p>Links in additional target libraries to support operation within a
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simulator.
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</p>
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</dd>
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<dt><code>-mmul=none</code></dt>
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<dt><code>-mmul=g10</code></dt>
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<dt><code>-mmul=g13</code></dt>
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<dt><code>-mmul=g14</code></dt>
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<dt><code>-mmul=rl78</code></dt>
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<dd><a name="index-mmul"></a>
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<p>Specifies the type of hardware multiplication and division support to
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be used. The simplest is <code>none</code>, which uses software for both
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multiplication and division. This is the default. The <code>g13</code>
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value is for the hardware multiply/divide peripheral found on the
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RL78/G13 (S2 core) targets. The <code>g14</code> value selects the use of
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the multiplication and division instructions supported by the RL78/G14
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(S3 core) parts. The value <code>rl78</code> is an alias for <code>g14</code> and
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the value <code>mg10</code> is an alias for <code>none</code>.
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</p>
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<p>In addition a C preprocessor macro is defined, based upon the setting
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of this option. Possible values are: <code>__RL78_MUL_NONE__</code>,
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<code>__RL78_MUL_G13__</code> or <code>__RL78_MUL_G14__</code>.
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</p>
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</dd>
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<dt><code>-mcpu=g10</code></dt>
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<dt><code>-mcpu=g13</code></dt>
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<dt><code>-mcpu=g14</code></dt>
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<dt><code>-mcpu=rl78</code></dt>
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<dd><a name="index-mcpu-8"></a>
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<p>Specifies the RL78 core to target. The default is the G14 core, also
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known as an S3 core or just RL78. The G13 or S2 core does not have
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multiply or divide instructions, instead it uses a hardware peripheral
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for these operations. The G10 or S1 core does not have register
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banks, so it uses a different calling convention.
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</p>
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<p>If this option is set it also selects the type of hardware multiply
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support to use, unless this is overridden by an explicit
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<samp>-mmul=none</samp> option on the command line. Thus specifying
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<samp>-mcpu=g13</samp> enables the use of the G13 hardware multiply
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peripheral and specifying <samp>-mcpu=g10</samp> disables the use of
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hardware multiplications altogether.
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</p>
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<p>Note, although the RL78/G14 core is the default target, specifying
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<samp>-mcpu=g14</samp> or <samp>-mcpu=rl78</samp> on the command line does
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change the behavior of the toolchain since it also enables G14
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hardware multiply support. If these options are not specified on the
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command line then software multiplication routines will be used even
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though the code targets the RL78 core. This is for backwards
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compatibility with older toolchains which did not have hardware
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multiply and divide support.
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</p>
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<p>In addition a C preprocessor macro is defined, based upon the setting
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of this option. Possible values are: <code>__RL78_G10__</code>,
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<code>__RL78_G13__</code> or <code>__RL78_G14__</code>.
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</p>
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</dd>
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<dt><code>-mg10</code></dt>
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<dt><code>-mg13</code></dt>
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<dt><code>-mg14</code></dt>
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<dt><code>-mrl78</code></dt>
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<dd><a name="index-mg10"></a>
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<a name="index-mg13"></a>
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<a name="index-mg14"></a>
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<a name="index-mrl78"></a>
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<p>These are aliases for the corresponding <samp>-mcpu=</samp> option. They
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are provided for backwards compatibility.
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</p>
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</dd>
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<dt><code>-mallregs</code></dt>
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<dd><a name="index-mallregs"></a>
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<p>Allow the compiler to use all of the available registers. By default
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registers <code>r24..r31</code> are reserved for use in interrupt handlers.
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With this option enabled these registers can be used in ordinary
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functions as well.
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</p>
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</dd>
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<dt><code>-m64bit-doubles</code></dt>
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<dt><code>-m32bit-doubles</code></dt>
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<dd><a name="index-m64bit_002ddoubles"></a>
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<a name="index-m32bit_002ddoubles"></a>
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<p>Make the <code>double</code> data type be 64 bits (<samp>-m64bit-doubles</samp>)
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or 32 bits (<samp>-m32bit-doubles</samp>) in size. The default is
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<samp>-m32bit-doubles</samp>.
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</p>
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</dd>
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</dl>
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<hr>
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<div class="header">
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<p>
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Next: <a href="RS_002f6000-and-PowerPC-Options.html#RS_002f6000-and-PowerPC-Options" accesskey="n" rel="next">RS/6000 and PowerPC Options</a>, Previous: <a href="PowerPC-Options.html#PowerPC-Options" accesskey="p" rel="prev">PowerPC 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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</div>
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</body>
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</html>
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