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| <a name="Mnemonic-Attribute-1"></a> |
| <h4 class="subsection">16.19.7 Mnemonic Attribute</h4> |
| <a name="index-mnemonic-attribute"></a> |
| |
| <p>The <code>mnemonic</code> attribute is a string type attribute holding the |
| instruction mnemonic for an insn alternative. The attribute values |
| will automatically be generated by the machine description parser if |
| there is an attribute definition in the md file: |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">(define_attr "mnemonic" "unknown" (const_string "unknown")) |
| </pre></div> |
| |
| <p>The default value can be freely chosen as long as it does not collide |
| with any of the instruction mnemonics. This value will be used |
| whenever the machine description parser is not able to determine the |
| mnemonic string. This might be the case for output templates |
| containing more than a single instruction as in |
| <code>"mvcle\t%0,%1,0\;jo\t.-4"</code>. |
| </p> |
| <p>The <code>mnemonic</code> attribute set is not generated automatically if the |
| instruction string is generated via C code. |
| </p> |
| <p>An existing <code>mnemonic</code> attribute set in an insn definition will not |
| be overriden by the md file parser. That way it is possible to |
| manually set the instruction mnemonics for the cases where the md file |
| parser fails to determine it automatically. |
| </p> |
| <p>The <code>mnemonic</code> attribute is useful for dealing with instruction |
| specific properties in the pipeline description without defining |
| additional insn attributes. |
| </p> |
| <div class="smallexample"> |
| <pre class="smallexample">(define_attr "ooo_expanded" "" |
| (cond [(eq_attr "mnemonic" "dlr,dsgr,d,dsgf,stam,dsgfr,dlgr") |
| (const_int 1)] |
| (const_int 0))) |
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