129 lines
5.3 KiB
HTML
129 lines
5.3 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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(a) The FSF's Front-Cover Text is:
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A GNU Manual
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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: Examples</title>
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<meta name="description" content="GNU Compiler Collection (GCC) Internals: Examples">
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<meta name="keywords" content="GNU Compiler Collection (GCC) Internals: Examples">
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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="Mode-Iterators.html#Mode-Iterators" rel="up" title="Mode Iterators">
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<link href="Code-Iterators.html#Code-Iterators" rel="next" title="Code Iterators">
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<link href="Substitutions.html#Substitutions" rel="prev" title="Substitutions">
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="Examples"></a>
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<div class="header">
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<p>
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Previous: <a href="Substitutions.html#Substitutions" accesskey="p" rel="prev">Substitutions</a>, Up: <a href="Mode-Iterators.html#Mode-Iterators" accesskey="u" rel="up">Mode Iterators</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="Mode-Iterator-Examples"></a>
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<h4 class="subsubsection">16.23.1.3 Mode Iterator Examples</h4>
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<p>Here is an example from the MIPS port. It defines the following
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modes and attributes (among others):
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</p>
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<div class="smallexample">
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<pre class="smallexample">(define_mode_iterator GPR [SI (DI "TARGET_64BIT")])
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(define_mode_attr d [(SI "") (DI "d")])
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</pre></div>
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<p>and uses the following template to define both <code>subsi3</code>
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and <code>subdi3</code>:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(define_insn "sub<mode>3"
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[(set (match_operand:GPR 0 "register_operand" "=d")
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(minus:GPR (match_operand:GPR 1 "register_operand" "d")
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(match_operand:GPR 2 "register_operand" "d")))]
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""
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"<d>subu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "<MODE>")])
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</pre></div>
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<p>This is exactly equivalent to:
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</p>
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<div class="smallexample">
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<pre class="smallexample">(define_insn "subsi3"
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[(set (match_operand:SI 0 "register_operand" "=d")
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(minus:SI (match_operand:SI 1 "register_operand" "d")
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(match_operand:SI 2 "register_operand" "d")))]
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""
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"subu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "SI")])
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(define_insn "subdi3"
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[(set (match_operand:DI 0 "register_operand" "=d")
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(minus:DI (match_operand:DI 1 "register_operand" "d")
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(match_operand:DI 2 "register_operand" "d")))]
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""
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"dsubu\t%0,%1,%2"
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[(set_attr "type" "arith")
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(set_attr "mode" "DI")])
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</pre></div>
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</body>
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</html>
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