You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
6.0 KiB
HTML
104 lines
6.0 KiB
HTML
<html lang="en">
|
|
<head>
|
|
<title>MMIX 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="MIPS-Options.html#MIPS-Options" title="MIPS Options">
|
|
<link rel="next" href="MN10300-Options.html#MN10300-Options" title="MN10300 Options">
|
|
<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
|
|
<!--
|
|
Copyright (C) 1988-2015 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="MMIX-Options"></a>
|
|
<p>
|
|
Next: <a rel="next" accesskey="n" href="MN10300-Options.html#MN10300-Options">MN10300 Options</a>,
|
|
Previous: <a rel="previous" accesskey="p" href="MIPS-Options.html#MIPS-Options">MIPS Options</a>,
|
|
Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel-Options">Submodel Options</a>
|
|
<hr>
|
|
</div>
|
|
|
|
<h4 class="subsection">3.17.26 MMIX Options</h4>
|
|
|
|
<p><a name="index-MMIX-Options-2066"></a>
|
|
These options are defined for the MMIX:
|
|
|
|
<dl>
|
|
<dt><code>-mlibfuncs</code><dt><code>-mno-libfuncs</code><dd><a name="index-mlibfuncs-2067"></a><a name="index-mno_002dlibfuncs-2068"></a>Specify that intrinsic library functions are being compiled, passing all
|
|
values in registers, no matter the size.
|
|
|
|
<br><dt><code>-mepsilon</code><dt><code>-mno-epsilon</code><dd><a name="index-mepsilon-2069"></a><a name="index-mno_002depsilon-2070"></a>Generate floating-point comparison instructions that compare with respect
|
|
to the <code>rE</code> epsilon register.
|
|
|
|
<br><dt><code>-mabi=mmixware</code><dt><code>-mabi=gnu</code><dd><a name="index-mabi_003dmmixware-2071"></a><a name="index-mabi_003dgnu-2072"></a>Generate code that passes function parameters and return values that (in
|
|
the called function) are seen as registers <code>$0</code> and up, as opposed to
|
|
the GNU ABI which uses global registers <code>$231</code> and up.
|
|
|
|
<br><dt><code>-mzero-extend</code><dt><code>-mno-zero-extend</code><dd><a name="index-mzero_002dextend-2073"></a><a name="index-mno_002dzero_002dextend-2074"></a>When reading data from memory in sizes shorter than 64 bits, use (do not
|
|
use) zero-extending load instructions by default, rather than
|
|
sign-extending ones.
|
|
|
|
<br><dt><code>-mknuthdiv</code><dt><code>-mno-knuthdiv</code><dd><a name="index-mknuthdiv-2075"></a><a name="index-mno_002dknuthdiv-2076"></a>Make the result of a division yielding a remainder have the same sign as
|
|
the divisor. With the default, <samp><span class="option">-mno-knuthdiv</span></samp>, the sign of the
|
|
remainder follows the sign of the dividend. Both methods are
|
|
arithmetically valid, the latter being almost exclusively used.
|
|
|
|
<br><dt><code>-mtoplevel-symbols</code><dt><code>-mno-toplevel-symbols</code><dd><a name="index-mtoplevel_002dsymbols-2077"></a><a name="index-mno_002dtoplevel_002dsymbols-2078"></a>Prepend (do not prepend) a ‘<samp><span class="samp">:</span></samp>’ to all global symbols, so the assembly
|
|
code can be used with the <code>PREFIX</code> assembly directive.
|
|
|
|
<br><dt><code>-melf</code><dd><a name="index-melf-2079"></a>Generate an executable in the ELF format, rather than the default
|
|
‘<samp><span class="samp">mmo</span></samp>’ format used by the <samp><span class="command">mmix</span></samp> simulator.
|
|
|
|
<br><dt><code>-mbranch-predict</code><dt><code>-mno-branch-predict</code><dd><a name="index-mbranch_002dpredict-2080"></a><a name="index-mno_002dbranch_002dpredict-2081"></a>Use (do not use) the probable-branch instructions, when static branch
|
|
prediction indicates a probable branch.
|
|
|
|
<br><dt><code>-mbase-addresses</code><dt><code>-mno-base-addresses</code><dd><a name="index-mbase_002daddresses-2082"></a><a name="index-mno_002dbase_002daddresses-2083"></a>Generate (do not generate) code that uses <em>base addresses</em>. Using a
|
|
base address automatically generates a request (handled by the assembler
|
|
and the linker) for a constant to be set up in a global register. The
|
|
register is used for one or more base address requests within the range 0
|
|
to 255 from the value held in the register. The generally leads to short
|
|
and fast code, but the number of different data items that can be
|
|
addressed is limited. This means that a program that uses lots of static
|
|
data may require <samp><span class="option">-mno-base-addresses</span></samp>.
|
|
|
|
<br><dt><code>-msingle-exit</code><dt><code>-mno-single-exit</code><dd><a name="index-msingle_002dexit-2084"></a><a name="index-mno_002dsingle_002dexit-2085"></a>Force (do not force) generated code to have a single exit point in each
|
|
function.
|
|
</dl>
|
|
|
|
</body></html>
|
|
|