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| <a name="Instruction-Attributes"></a> |
| <h3 class="section">16.19 Instruction Attributes</h3> |
| <a name="index-insn-attributes"></a> |
| <a name="index-instruction-attributes"></a> |
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| <p>In addition to describing the instruction supported by the target machine, |
| the <samp>md</samp> file also defines a group of <em>attributes</em> and a set of |
| values for each. Every generated insn is assigned a value for each attribute. |
| One possible attribute would be the effect that the insn has on the machine’s |
| condition code. This attribute can then be used by <code>NOTICE_UPDATE_CC</code> |
| to track the condition codes. |
| </p> |
| <table class="menu" border="0" cellspacing="0"> |
| <tr><td align="left" valign="top">• <a href="Defining-Attributes.html#Defining-Attributes" accesskey="1">Defining Attributes</a>:</td><td> </td><td align="left" valign="top">Specifying attributes and their values. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Expressions.html#Expressions" accesskey="2">Expressions</a>:</td><td> </td><td align="left" valign="top">Valid expressions for attribute values. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Tagging-Insns.html#Tagging-Insns" accesskey="3">Tagging Insns</a>:</td><td> </td><td align="left" valign="top">Assigning attribute values to insns. |
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| <tr><td align="left" valign="top">• <a href="Attr-Example.html#Attr-Example" accesskey="4">Attr Example</a>:</td><td> </td><td align="left" valign="top">An example of assigning attributes. |
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| <tr><td align="left" valign="top">• <a href="Insn-Lengths.html#Insn-Lengths" accesskey="5">Insn Lengths</a>:</td><td> </td><td align="left" valign="top">Computing the length of insns. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Constant-Attributes.html#Constant-Attributes" accesskey="6">Constant Attributes</a>:</td><td> </td><td align="left" valign="top">Defining attributes that are constant. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Mnemonic-Attribute.html#Mnemonic-Attribute" accesskey="7">Mnemonic Attribute</a>:</td><td> </td><td align="left" valign="top">Obtain the instruction mnemonic as attribute value. |
| </td></tr> |
| <tr><td align="left" valign="top">• <a href="Delay-Slots.html#Delay-Slots" accesskey="8">Delay Slots</a>:</td><td> </td><td align="left" valign="top">Defining delay slots required for a machine. |
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| <tr><td align="left" valign="top">• <a href="Processor-pipeline-description.html#Processor-pipeline-description" accesskey="9">Processor pipeline description</a>:</td><td> </td><td align="left" valign="top">Specifying information for insn scheduling. |
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