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+Next: <a href="Define-Subst-Output-Template.html#Define-Subst-Output-Template" accesskey="n" rel="next">Define Subst Output Template</a>, Previous: <a href="Define-Subst-Example.html#Define-Subst-Example" accesskey="p" rel="previous">Define Subst Example</a>, Up: <a href="Define-Subst.html#Define-Subst" accesskey="u" rel="up">Define Subst</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
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+<hr>
+<a name="Pattern-Matching-in-define_005fsubst"></a>
+<h4 class="subsection">17.21.2 Pattern Matching in <code>define_subst</code></h4>
+<a name="index-define_005fsubst-2"></a>
+
+<p>All expressions, allowed in <code>define_insn</code> or <code>define_expand</code>,
+are allowed in the input-template of <code>define_subst</code>, except
+<code>match_par_dup</code>, <code>match_scratch</code>, <code>match_parallel</code>. The
+meanings of expressions in the input-template were changed:
+</p>
+<p><code>match_operand</code> matches any expression (possibly, a subtree in
+RTL-template), if modes of the <code>match_operand</code> and this expression
+are the same, or mode of the <code>match_operand</code> is <code>VOIDmode</code>, or
+this expression is <code>match_dup</code>, <code>match_op_dup</code>.  If the
+expression is <code>match_operand</code> too, and predicate of
+<code>match_operand</code> from the input pattern is not empty, then the
+predicates are compared.  That can be used for more accurate filtering
+of accepted RTL-templates.
+</p>
+<p><code>match_operator</code> matches common operators (like <code>plus</code>,
+<code>minus</code>), <code>unspec</code>, <code>unspec_volatile</code> operators and
+<code>match_operator</code>s from the original pattern if the modes match and
+<code>match_operator</code> from the input pattern has the same number of
+operands as the operator from the original pattern.
+</p>
+
+
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