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83 lines
3.4 KiB
HTML
83 lines
3.4 KiB
HTML
4 years ago
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<title>Operands - GNU Compiler Collection (GCC) Internals</title>
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<meta http-equiv="Content-Type" content="text/html">
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<meta name="description" content="GNU Compiler Collection (GCC) Internals">
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<meta name="generator" content="makeinfo 4.13">
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<link title="Top" rel="start" href="index.html#Top">
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<link rel="up" href="GIMPLE.html#GIMPLE" title="GIMPLE">
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<link rel="prev" href="Temporaries.html#Temporaries" title="Temporaries">
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<link rel="next" href="Manipulating-GIMPLE-statements.html#Manipulating-GIMPLE-statements" title="Manipulating GIMPLE statements">
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<link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage">
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<!--
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Copyright (C) 1988-2015 Free Software Foundation, Inc.
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Permission is granted to copy, distribute and/or modify this document
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under the terms of the GNU Free Documentation License, Version 1.3 or
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any later version published by the Free Software Foundation; with the
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Invariant Sections being ``Funding Free Software'', the Front-Cover
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(see below). A copy of the license is included in the section entitled
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``GNU Free Documentation License''.
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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(b) The FSF's Back-Cover Text is:
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You have freedom to copy and modify this GNU Manual, like GNU
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funds for GNU development.-->
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</head>
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<body>
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<div class="node">
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<a name="Operands"></a>
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<p>
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Next: <a rel="next" accesskey="n" href="Manipulating-GIMPLE-statements.html#Manipulating-GIMPLE-statements">Manipulating GIMPLE statements</a>,
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Previous: <a rel="previous" accesskey="p" href="Temporaries.html#Temporaries">Temporaries</a>,
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Up: <a rel="up" accesskey="u" href="GIMPLE.html#GIMPLE">GIMPLE</a>
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<hr>
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</div>
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<h3 class="section">11.6 Operands</h3>
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<p><a name="index-Operands-2140"></a>
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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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<pre class="smallexample"> a = b + c + d
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</pre>
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<p>becomes
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<pre class="smallexample"> T1 = b + c;
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a = T1 + d;
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</pre>
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<p>The same rule holds for arguments to a <code>GIMPLE_CALL</code>.
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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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<ul class="menu">
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<li><a accesskey="1" href="Compound-Expressions.html#Compound-Expressions">Compound Expressions</a>
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<li><a accesskey="2" href="Compound-Lvalues.html#Compound-Lvalues">Compound Lvalues</a>
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<li><a accesskey="3" href="Conditional-Expressions.html#Conditional-Expressions">Conditional Expressions</a>
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<li><a accesskey="4" href="Logical-Operators.html#Logical-Operators">Logical Operators</a>
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</ul>
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</body></html>
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