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diff --git a/share/doc/gccint/Mnemonic-Attribute.html b/share/doc/gccint/Mnemonic-Attribute.html new file mode 100644 index 0000000..011309a --- /dev/null +++ b/share/doc/gccint/Mnemonic-Attribute.html @@ -0,0 +1,120 @@ +<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> +<html> +<!-- Copyright (C) 1988-2023 Free Software Foundation, Inc. + +Permission is granted to copy, distribute and/or modify this document +under the terms of the GNU Free Documentation License, Version 1.3 or +any later version published by the Free Software Foundation; with the +Invariant Sections being "Funding Free Software", the Front-Cover +Texts being (a) (see below), and with the Back-Cover Texts being (b) +(see below). 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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))) +</pre></div> + + + + +</body> +</html> |