116 lines
5.1 KiB
HTML
116 lines
5.1 KiB
HTML
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<html>
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<!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>GNU Compiler Collection (GCC) Internals: Operands</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: Operands">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Operands">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="GIMPLE.html#GIMPLE" rel="up" title="GIMPLE">
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<link href="Compound-Expressions.html#Compound-Expressions" rel="next" title="Compound Expressions">
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<link href="Temporaries.html#Temporaries" rel="prev" title="Temporaries">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Operands"></a>
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<div class="header">
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<p>
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Next: <a href="Manipulating-GIMPLE-statements.html#Manipulating-GIMPLE-statements" accesskey="n" rel="next">Manipulating GIMPLE statements</a>, Previous: <a href="Temporaries.html#Temporaries" accesskey="p" rel="prev">Temporaries</a>, Up: <a href="GIMPLE.html#GIMPLE" accesskey="u" rel="up">GIMPLE</a> [<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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</div>
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<hr>
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<a name="Operands-1"></a>
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<h3 class="section">11.6 Operands</h3>
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<a name="index-Operands"></a>
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<p>In general, expressions in GIMPLE consist of an operation and the
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appropriate number of simple operands; these operands must either be a
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GIMPLE rvalue (<code>is_gimple_val</code>), i.e. a constant or a register
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variable. More complex operands are factored out into temporaries, so
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that
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</p><div class="smallexample">
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<pre class="smallexample">a = b + c + d
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</pre></div>
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<p>becomes
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</p><div class="smallexample">
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<pre class="smallexample">T1 = b + c;
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a = T1 + d;
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</pre></div>
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<p>The same rule holds for arguments to a <code>GIMPLE_CALL</code>.
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</p>
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<p>The target of an assignment is usually a variable, but can also be a
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<code>MEM_REF</code> or a compound lvalue as described below.
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</p>
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<table class="menu" border="0" cellspacing="0">
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<tr><td align="left" valign="top">• <a href="Compound-Expressions.html#Compound-Expressions" accesskey="1">Compound Expressions</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Compound-Lvalues.html#Compound-Lvalues" accesskey="2">Compound Lvalues</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Conditional-Expressions.html#Conditional-Expressions" accesskey="3">Conditional Expressions</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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<tr><td align="left" valign="top">• <a href="Logical-Operators.html#Logical-Operators" accesskey="4">Logical Operators</a>:</td><td> </td><td align="left" valign="top">
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</td></tr>
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</table>
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</body>
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</html>
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