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104 lines
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104 lines
6.0 KiB
HTML
4 years ago
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<title>MMIX Options - Using the GNU Compiler Collection (GCC)</title>
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<meta name="description" content="Using the GNU Compiler Collection (GCC)">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Submodel-Options.html#Submodel-Options" title="Submodel Options">
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<link rel="prev" href="MIPS-Options.html#MIPS-Options" title="MIPS Options">
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<link rel="next" href="MN10300-Options.html#MN10300-Options" title="MN10300 Options">
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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</head>
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<body>
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<div class="node">
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<a name="MMIX-Options"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="MN10300-Options.html#MN10300-Options">MN10300 Options</a>,
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Previous: <a rel="previous" accesskey="p" href="MIPS-Options.html#MIPS-Options">MIPS Options</a>,
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Up: <a rel="up" accesskey="u" href="Submodel-Options.html#Submodel-Options">Submodel Options</a>
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<hr>
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</div>
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<h4 class="subsection">3.17.26 MMIX Options</h4>
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<p><a name="index-MMIX-Options-2066"></a>
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These options are defined for the MMIX:
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<dl>
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<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
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values in registers, no matter the size.
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<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
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to the <code>rE</code> epsilon register.
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<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
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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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<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
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use) zero-extending load instructions by default, rather than
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sign-extending ones.
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<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
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the divisor. With the default, <samp><span class="option">-mno-knuthdiv</span></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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<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
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code can be used with the <code>PREFIX</code> assembly directive.
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<br><dt><code>-melf</code><dd><a name="index-melf-2079"></a>Generate an executable in the ELF format, rather than the default
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‘<samp><span class="samp">mmo</span></samp>’ format used by the <samp><span class="command">mmix</span></samp> simulator.
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<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
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prediction indicates a probable branch.
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<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
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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><span class="option">-mno-base-addresses</span></samp>.
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<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
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function.
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</dl>
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</body></html>
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