183 lines
7.6 KiB
HTML
183 lines
7.6 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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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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software. Copies published by the Free Software Foundation raise
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funds for GNU development. -->
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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): MMIX Options</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC): MMIX Options">
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<meta name="keywords" content="Using the GNU Compiler Collection (GCC): MMIX Options">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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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="MN10300-Options.html#MN10300-Options" rel="next" title="MN10300 Options">
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<link href="MIPS-Options.html#MIPS-Options" rel="prev" title="MIPS Options">
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<style type="text/css">
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="MMIX-Options"></a>
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<div class="header">
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<p>
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Next: <a href="MN10300-Options.html#MN10300-Options" accesskey="n" rel="next">MN10300 Options</a>, Previous: <a href="MIPS-Options.html#MIPS-Options" accesskey="p" rel="prev">MIPS 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="MMIX-Options-1"></a>
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<h4 class="subsection">3.18.27 MMIX Options</h4>
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<a name="index-MMIX-Options"></a>
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<p>These options are defined for the MMIX:
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</p>
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<dl compact="compact">
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<dt><code>-mlibfuncs</code></dt>
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<dt><code>-mno-libfuncs</code></dt>
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<dd><a name="index-mlibfuncs"></a>
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<a name="index-mno_002dlibfuncs"></a>
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<p>Specify that intrinsic library functions are being compiled, passing all
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values in registers, no matter the size.
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</p>
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</dd>
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<dt><code>-mepsilon</code></dt>
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<dt><code>-mno-epsilon</code></dt>
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<dd><a name="index-mepsilon"></a>
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<a name="index-mno_002depsilon"></a>
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<p>Generate floating-point comparison instructions that compare with respect
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to the <code>rE</code> epsilon register.
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</p>
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</dd>
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<dt><code>-mabi=mmixware</code></dt>
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<dt><code>-mabi=gnu</code></dt>
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<dd><a name="index-mabi_003dmmixware"></a>
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<a name="index-mabi_003dgnu"></a>
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<p>Generate code that passes function parameters and return values that (in
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the called function) are seen as registers <code>$0</code> and up, as opposed to
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the GNU ABI which uses global registers <code>$231</code> and up.
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</p>
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</dd>
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<dt><code>-mzero-extend</code></dt>
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<dt><code>-mno-zero-extend</code></dt>
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<dd><a name="index-mzero_002dextend"></a>
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<a name="index-mno_002dzero_002dextend"></a>
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<p>When reading data from memory in sizes shorter than 64 bits, use (do not
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use) zero-extending load instructions by default, rather than
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sign-extending ones.
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</p>
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</dd>
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<dt><code>-mknuthdiv</code></dt>
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<dt><code>-mno-knuthdiv</code></dt>
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<dd><a name="index-mknuthdiv"></a>
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<a name="index-mno_002dknuthdiv"></a>
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<p>Make the result of a division yielding a remainder have the same sign as
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the divisor. With the default, <samp>-mno-knuthdiv</samp>, the sign of the
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remainder follows the sign of the dividend. Both methods are
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arithmetically valid, the latter being almost exclusively used.
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</p>
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</dd>
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<dt><code>-mtoplevel-symbols</code></dt>
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<dt><code>-mno-toplevel-symbols</code></dt>
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<dd><a name="index-mtoplevel_002dsymbols"></a>
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<a name="index-mno_002dtoplevel_002dsymbols"></a>
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<p>Prepend (do not prepend) a ‘<samp>:</samp>’ to all global symbols, so the assembly
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code can be used with the <code>PREFIX</code> assembly directive.
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</p>
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</dd>
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<dt><code>-melf</code></dt>
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<dd><a name="index-melf-1"></a>
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<p>Generate an executable in the ELF format, rather than the default
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‘<samp>mmo</samp>’ format used by the <code>mmix</code> simulator.
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</p>
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</dd>
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<dt><code>-mbranch-predict</code></dt>
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<dt><code>-mno-branch-predict</code></dt>
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<dd><a name="index-mbranch_002dpredict"></a>
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<a name="index-mno_002dbranch_002dpredict"></a>
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<p>Use (do not use) the probable-branch instructions, when static branch
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prediction indicates a probable branch.
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</p>
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</dd>
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<dt><code>-mbase-addresses</code></dt>
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<dt><code>-mno-base-addresses</code></dt>
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<dd><a name="index-mbase_002daddresses"></a>
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<a name="index-mno_002dbase_002daddresses"></a>
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<p>Generate (do not generate) code that uses <em>base addresses</em>. Using a
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base address automatically generates a request (handled by the assembler
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and the linker) for a constant to be set up in a global register. The
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register is used for one or more base address requests within the range 0
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to 255 from the value held in the register. The generally leads to short
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and fast code, but the number of different data items that can be
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addressed is limited. This means that a program that uses lots of static
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data may require <samp>-mno-base-addresses</samp>.
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</p>
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</dd>
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<dt><code>-msingle-exit</code></dt>
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<dt><code>-mno-single-exit</code></dt>
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<dd><a name="index-msingle_002dexit"></a>
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<a name="index-mno_002dsingle_002dexit"></a>
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<p>Force (do not force) generated code to have a single exit point in each
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function.
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</p></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="MN10300-Options.html#MN10300-Options" accesskey="n" rel="next">MN10300 Options</a>, Previous: <a href="MIPS-Options.html#MIPS-Options" accesskey="p" rel="prev">MIPS 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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