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79 lines
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79 lines
4.2 KiB
HTML
4 years ago
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<title>Insn Attributes - GNU Compiler Collection (GCC) Internals</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="Machine-Desc.html#Machine-Desc" title="Machine Desc">
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<link rel="prev" href="Peephole-Definitions.html#Peephole-Definitions" title="Peephole Definitions">
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<link rel="next" href="Conditional-Execution.html#Conditional-Execution" title="Conditional Execution">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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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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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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(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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</head>
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<body>
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<div class="node">
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<a name="Insn-Attributes"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Conditional-Execution.html#Conditional-Execution">Conditional Execution</a>,
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Previous: <a rel="previous" accesskey="p" href="Peephole-Definitions.html#Peephole-Definitions">Peephole Definitions</a>,
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Up: <a rel="up" accesskey="u" href="Machine-Desc.html#Machine-Desc">Machine Desc</a>
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<hr>
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</div>
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<h3 class="section">16.19 Instruction Attributes</h3>
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<p><a name="index-insn-attributes-3719"></a><a name="index-instruction-attributes-3720"></a>
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In addition to describing the instruction supported by the target machine,
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the <samp><span class="file">md</span></samp> file also defines a group of <dfn>attributes</dfn> and a set of
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values for each. Every generated insn is assigned a value for each attribute.
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One possible attribute would be the effect that the insn has on the machine's
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condition code. This attribute can then be used by <code>NOTICE_UPDATE_CC</code>
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to track the condition codes.
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<ul class="menu">
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<li><a accesskey="1" href="Defining-Attributes.html#Defining-Attributes">Defining Attributes</a>: Specifying attributes and their values.
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<li><a accesskey="2" href="Expressions.html#Expressions">Expressions</a>: Valid expressions for attribute values.
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<li><a accesskey="3" href="Tagging-Insns.html#Tagging-Insns">Tagging Insns</a>: Assigning attribute values to insns.
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<li><a accesskey="4" href="Attr-Example.html#Attr-Example">Attr Example</a>: An example of assigning attributes.
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<li><a accesskey="5" href="Insn-Lengths.html#Insn-Lengths">Insn Lengths</a>: Computing the length of insns.
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<li><a accesskey="6" href="Constant-Attributes.html#Constant-Attributes">Constant Attributes</a>: Defining attributes that are constant.
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<li><a accesskey="7" href="Mnemonic-Attribute.html#Mnemonic-Attribute">Mnemonic Attribute</a>: Obtain the instruction mnemonic as attribute value.
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<li><a accesskey="8" href="Delay-Slots.html#Delay-Slots">Delay Slots</a>: Defining delay slots required for a machine.
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<li><a accesskey="9" href="Processor-pipeline-description.html#Processor-pipeline-description">Processor pipeline description</a>: Specifying information for insn scheduling.
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</ul>
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</body></html>
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