| <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| <html> |
| <!-- This file documents the GNU Assembler "as". |
| |
| Copyright (C) 1991-2013 Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.3 |
| or any later version published by the Free Software Foundation; |
| with no Invariant Sections, with no Front-Cover Texts, and with no |
| Back-Cover Texts. A copy of the license is included in the |
| section entitled "GNU Free Documentation License". |
| --> |
| <!-- Created by GNU Texinfo 5.2, http://www.gnu.org/software/texinfo/ --> |
| <head> |
| <title>Using as: SH Floating Point</title> |
| |
| <meta name="description" content="Using as: SH Floating Point"> |
| <meta name="keywords" content="Using as: SH Floating Point"> |
| <meta name="resource-type" content="document"> |
| <meta name="distribution" content="global"> |
| <meta name="Generator" content="makeinfo"> |
| <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> |
| <link href="index.html#Top" rel="start" title="Top"> |
| <link href="AS-Index.html#AS-Index" rel="index" title="AS Index"> |
| <link href="index.html#SEC_Contents" rel="contents" title="Table of Contents"> |
| <link href="SH_002dDependent.html#SH_002dDependent" rel="up" title="SH-Dependent"> |
| <link href="SH-Directives.html#SH-Directives" rel="next" title="SH Directives"> |
| <link href="SH_002dAddressing.html#SH_002dAddressing" rel="prev" title="SH-Addressing"> |
| <style type="text/css"> |
| <!-- |
| a.summary-letter {text-decoration: none} |
| blockquote.smallquotation {font-size: smaller} |
| div.display {margin-left: 3.2em} |
| div.example {margin-left: 3.2em} |
| div.indentedblock {margin-left: 3.2em} |
| div.lisp {margin-left: 3.2em} |
| div.smalldisplay {margin-left: 3.2em} |
| div.smallexample {margin-left: 3.2em} |
| div.smallindentedblock {margin-left: 3.2em; font-size: smaller} |
| div.smalllisp {margin-left: 3.2em} |
| kbd {font-style:oblique} |
| pre.display {font-family: inherit} |
| pre.format {font-family: inherit} |
| pre.menu-comment {font-family: serif} |
| pre.menu-preformatted {font-family: serif} |
| pre.smalldisplay {font-family: inherit; font-size: smaller} |
| pre.smallexample {font-size: smaller} |
| pre.smallformat {font-family: inherit; font-size: smaller} |
| pre.smalllisp {font-size: smaller} |
| span.nocodebreak {white-space:nowrap} |
| span.nolinebreak {white-space:nowrap} |
| span.roman {font-family:serif; font-weight:normal} |
| span.sansserif {font-family:sans-serif; font-weight:normal} |
| ul.no-bullet {list-style: none} |
| --> |
| </style> |
| |
| |
| </head> |
| |
| <body lang="en" bgcolor="#FFFFFF" text="#000000" link="#0000FF" vlink="#800080" alink="#FF0000"> |
| <a name="SH-Floating-Point"></a> |
| <div class="header"> |
| <p> |
| 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> |
| </div> |
| <hr> |
| <a name="Floating-Point-16"></a> |
| <h4 class="subsection">9.39.3 Floating Point</h4> |
| |
| <a name="index-floating-point_002c-SH-_0028IEEE_0029"></a> |
| <a name="index-SH-floating-point-_0028IEEE_0029"></a> |
| <p>SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other |
| SH groups can use <code>.float</code> directive to generate <small>IEEE</small> |
| floating-point numbers. |
| </p> |
| <p>SH2E and SH3E support single-precision floating point calculations as |
| well as entirely PCAPI compatible emulation of double-precision |
| floating point calculations. SH2E and SH3E instructions are a subset of |
| the floating point calculations conforming to the IEEE754 standard. |
| </p> |
| <p>In addition to single-precision and double-precision floating-point |
| operation capability, the on-chip FPU of SH4 has a 128-bit graphic |
| engine that enables 32-bit floating-point data to be processed 128 |
| bits at a time. It also supports 4 * 4 array operations and inner |
| product operations. Also, a superscalar architecture is employed that |
| enables simultaneous execution of two instructions (including FPU |
| instructions), providing performance of up to twice that of |
| conventional architectures at the same frequency. |
| </p> |
| |
| |
| |
| </body> |
| </html> |
