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<title>IA-64 Options - Using as</title>
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<!--
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This file documents the GNU Assembler "as".
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Copyright (C) 1991, 92, 93, 94, 95, 96, 97, 98, 99, 2000, 2001, 2002,
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2006, 2007 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 1.1
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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<div class="node">
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<p>
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<a name="IA_002d64-Options"></a>Next: <a rel="next" accesskey="n" href="IA_002d64-Syntax.html#IA_002d64-Syntax">IA-64 Syntax</a>,
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Up: <a rel="up" accesskey="u" href="IA_002d64_002dDependent.html#IA_002d64_002dDependent">IA-64-Dependent</a>
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<hr><br>
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</div>
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<h4 class="subsection">9.16.1 Options</h4>
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<p><a name="index-IA_002d64-options-1003"></a><a name="index-options-for-IA_002d64-1004"></a>
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<a name="index-_0040code_007b_002dmconstant_002dgp_007d-command-line-option_002c-IA_002d64-1005"></a>
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<dl>
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<dt><span class="option">-mconstant-gp</span><dd>This option instructs the assembler to mark the resulting object file
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as using the “constant GP” model. With this model, it is assumed
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that the entire program uses a single global pointer (GP) value. Note
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that this option does not in any fashion affect the machine code
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emitted by the assembler. All it does is turn on the EF_IA_64_CONS_GP
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flag in the ELF file header.
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<br><dt><span class="option">-mauto-pic</span><dd>This option instructs the assembler to mark the resulting object file
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as using the “constant GP without function descriptor” data model.
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This model is like the “constant GP” model, except that it
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additionally does away with function descriptors. What this means is
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that the address of a function refers directly to the function's code
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entry-point. Normally, such an address would refer to a function
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descriptor, which contains both the code entry-point and the GP-value
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needed by the function. Note that this option does not in any fashion
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affect the machine code emitted by the assembler. All it does is
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turn on the EF_IA_64_NOFUNCDESC_CONS_GP flag in the ELF file header.
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<br><dt><span class="option">-milp32</span><br><dt><span class="option">-milp64</span><br><dt><span class="option">-mlp64</span><br><dt><span class="option">-mp64</span><dd>These options select the data model. The assembler defaults to <code>-mlp64</code>
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(LP64 data model).
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<br><dt><span class="option">-mle</span><br><dt><span class="option">-mbe</span><dd>These options select the byte order. The <code>-mle</code> option selects little-endian
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byte order (default) and <code>-mbe</code> selects big-endian byte order. Note that
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IA-64 machine code always uses little-endian byte order.
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<br><dt><span class="option">-mtune=itanium1</span><br><dt><span class="option">-mtune=itanium2</span><dd>Tune for a particular IA-64 CPU, <var>itanium1</var> or <var>itanium2</var>. The
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default is <var>itanium2</var>.
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<br><dt><span class="option">-munwind-check=warning</span><br><dt><span class="option">-munwind-check=error</span><dd>These options control what the assembler will do when performing
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consistency checks on unwind directives. <code>-munwind-check=warning</code>
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will make the assembler issue a warning when an unwind directive check
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fails. This is the default. <code>-munwind-check=error</code> will make the
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assembler issue an error when an unwind directive check fails.
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<br><dt><span class="option">-mhint.b=ok</span><br><dt><span class="option">-mhint.b=warning</span><br><dt><span class="option">-mhint.b=error</span><dd>These options control what the assembler will do when the <span class="samp">hint.b</span>
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instruction is used. <code>-mhint.b=ok</code> will make the assembler accept
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<span class="samp">hint.b</span>. <code>-mint.b=warning</code> will make the assembler issue a
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warning when <span class="samp">hint.b</span> is used. <code>-mhint.b=error</code> will make
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the assembler treat <span class="samp">hint.b</span> as an error, which is the default.
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<br><dt><span class="option">-x</span><br><dt><span class="option">-xexplicit</span><dd>These options turn on dependency violation checking.
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<br><dt><span class="option">-xauto</span><dd>This option instructs the assembler to automatically insert stop bits where necessary
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to remove dependency violations. This is the default mode.
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<br><dt><span class="option">-xnone</span><dd>This option turns off dependency violation checking.
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<br><dt><span class="option">-xdebug</span><dd>This turns on debug output intended to help tracking down bugs in the dependency
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violation checker.
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<br><dt><span class="option">-xdebugn</span><dd>This is a shortcut for -xnone -xdebug.
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<br><dt><span class="option">-xdebugx</span><dd>This is a shortcut for -xexplicit -xdebug.
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</dl>
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<p><a name="index-IA_002d64-Syntax-1006"></a>
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</body></html>
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