97 lines
4.2 KiB
HTML
97 lines
4.2 KiB
HTML
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- This file documents the GNU Assembler "as".
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Copyright (C) 1991-2016 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
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or any later version published by the Free Software Foundation;
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with no Invariant Sections, with no Front-Cover Texts, and with no
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Back-Cover Texts. A copy of the license is included in the
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section entitled "GNU Free Documentation License".
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-->
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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>Using as: SH Floating Point</title>
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<meta name="description" content="Using as: SH Floating Point">
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<meta name="keywords" content="Using as: SH Floating Point">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="AS-Index.html#AS-Index" rel="index" title="AS Index">
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<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="SH_002dDependent.html#SH_002dDependent" rel="up" title="SH-Dependent">
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<link href="SH-Directives.html#SH-Directives" rel="next" title="SH Directives">
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<link href="SH_002dAddressing.html#SH_002dAddressing" rel="prev" title="SH-Addressing">
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<style type="text/css">
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<!--
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a.summary-letter {text-decoration: none}
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pre.format {font-family: inherit}
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span.nolinebreak {white-space:nowrap}
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span.roman {font-family:serif; font-weight:normal}
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span.sansserif {font-family:sans-serif; font-weight:normal}
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ul.no-bullet {list-style: none}
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-->
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</style>
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</head>
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<body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000">
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<a name="SH-Floating-Point"></a>
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<div class="header">
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<p>
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Next: <a href="SH-Directives.html#SH-Directives" accesskey="n" rel="next">SH Directives</a>, Previous: <a href="SH-Syntax.html#SH-Syntax" accesskey="p" rel="prev">SH Syntax</a>, Up: <a href="SH_002dDependent.html#SH_002dDependent" accesskey="u" rel="up">SH-Dependent</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="Floating-Point-15"></a>
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<h4 class="subsection">9.40.3 Floating Point</h4>
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<a name="index-floating-point_002c-SH-_0028IEEE_0029"></a>
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<a name="index-SH-floating-point-_0028IEEE_0029"></a>
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<p>SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other
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SH groups can use <code>.float</code> directive to generate <small>IEEE</small>
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floating-point numbers.
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</p>
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<p>SH2E and SH3E support single-precision floating point calculations as
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well as entirely PCAPI compatible emulation of double-precision
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floating point calculations. SH2E and SH3E instructions are a subset of
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the floating point calculations conforming to the IEEE754 standard.
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</p>
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<p>In addition to single-precision and double-precision floating-point
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operation capability, the on-chip FPU of SH4 has a 128-bit graphic
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engine that enables 32-bit floating-point data to be processed 128
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bits at a time. It also supports 4 * 4 array operations and inner
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product operations. Also, a superscalar architecture is employed that
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enables simultaneous execution of two instructions (including FPU
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instructions), providing performance of up to twice that of
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conventional architectures at the same frequency.
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</p>
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</body>
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</html>
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