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<title>Using as: Z80 Options</title>
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<a name="Z80-Options"></a>
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<div class="header">
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<p>
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Next: <a href="Z80-Syntax.html#Z80-Syntax" accesskey="n" rel="next">Z80 Syntax</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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<hr>
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<a name="Command_002dline-Options-3"></a>
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<h4 class="subsection">9.56.1 Command-line Options</h4>
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<a name="index-Z80-options"></a>
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<a name="index-options-for-Z80"></a>
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<dl compact="compact">
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<dd>
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<a name="index-_002dmarch_003d-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-march=<var>CPU</var>[-<var>EXT</var>…][+<var>EXT</var>…]</code></dt>
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<dd><p>This option specifies the target processor. The assembler will issue
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an error message if an attempt is made to assemble an instruction which
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will not execute on the target processor. The following processor names
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are recognized:
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<code>z80</code>,
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<code>z180</code>,
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<code>ez80</code>,
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<code>gbz80</code>,
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<code>z80n</code>,
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<code>r800</code>.
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In addition to the basic instruction set, the assembler can be told to
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accept some extention mnemonics. For example,
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<code>-march=z180+sli+infc</code> extends <var>z180</var> with <var>SLI</var> instructions and
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<var>IN F,(C)</var>. The following extentions are currently supported:
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<code>full</code> (all known instructions),
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<code>adl</code> (ADL CPU mode by default, eZ80 only),
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<code>sli</code> (instruction known as <var>SLI</var>, <var>SLL</var> or <var>SL1</var>),
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<code>xyhl</code> (instructions with halves of index registers: <var>IXL</var>, <var>IXH</var>,
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<var>IYL</var>, <var>IYH</var>),
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<code>xdcb</code> (instructions like <var>RotOp (II+d),R</var> and <var>BitOp n,(II+d),R</var>),
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<code>infc</code> (instruction <var>IN F,(C)</var> or <var>IN (C)</var>),
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<code>outc0</code> (instruction <var>OUT (C),0</var>).
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Note that rather than extending a basic instruction set, the extention
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mnemonics starting with <code>-</code> revoke the respective functionality:
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<code>-march=z80-full+xyhl</code> first removes all default extentions and adds
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support for index registers halves only.
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</p>
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<p>If this option is not specified then <code>-march=z80+xyhl+infc</code> is assumed.
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</p>
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<a name="index-_002dlocal_002dprefix-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-local-prefix=<var>prefix</var></code></dt>
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<dd><p>Mark all labels with specified prefix as local. But such label can be
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marked global explicitly in the code. This option do not change default
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local label prefix <code>.L</code>, it is just adds new one.
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</p>
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<a name="index-_002dcolonless-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-colonless</code></dt>
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<dd><p>Accept colonless labels. All symbols at line begin are treated as labels.
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</p>
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<a name="index-_002dsdcc-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-sdcc</code></dt>
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<dd><p>Accept assembler code produced by SDCC.
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</p>
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<a name="index-_002dfp_002ds-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-fp-s=<var>FORMAT</var></code></dt>
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<dd><p>Single precision floating point numbers format. Default: ieee754 (32 bit).
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</p>
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<a name="index-_002dfp_002dd-command_002dline-option_002c-Z80"></a>
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</dd>
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<dt><code>-fp-d=<var>FORMAT</var></code></dt>
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<dd><p>Double precision floating point numbers format. Default: ieee754 (64 bit).
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</p></dd>
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</dl>
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<p>Floating point numbers formats.
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</p><dl compact="compact">
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<dt><samp><code>ieee754</code></samp></dt>
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<dd><p>Single or double precision IEEE754 compatible format.
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</p>
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</dd>
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<dt><samp><code>half</code></samp></dt>
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<dd><p>Half precision IEEE754 compatible format (16 bits).
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</p>
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</dd>
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<dt><samp><code>single</code></samp></dt>
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<dd><p>Single precision IEEE754 compatible format (32 bits).
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</p>
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</dd>
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<dt><samp><code>double</code></samp></dt>
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<dd><p>Double precision IEEE754 compatible format (64 bits).
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</p>
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</dd>
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<dt><samp><code>zeda32</code></samp></dt>
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<dd><p>32 bit floating point format from z80float library by Zeda.
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</p>
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</dd>
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<dt><samp><code>math48</code></samp></dt>
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<dd><p>48 bit floating point format from Math48 package by Anders Hejlsberg.
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</p></dd>
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</dl>
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<a name="index-Z80-Syntax"></a>
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<hr>
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<div class="header">
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<p>
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Next: <a href="Z80-Syntax.html#Z80-Syntax" accesskey="n" rel="next">Z80 Syntax</a>, Up: <a href="Z80_002dDependent.html#Z80_002dDependent" accesskey="u" rel="up">Z80-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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