<html lang="en"> <head> <title>SH Floating Point - Using as</title> <meta http-equiv="Content-Type" content="text/html"> <meta name="description" content="Using as"> <meta name="generator" content="makeinfo 4.13"> <link title="Top" rel="start" href="index.html#Top"> <link rel="up" href="SH_002dDependent.html#SH_002dDependent" title="SH-Dependent"> <link rel="prev" href="SH-Syntax.html#SH-Syntax" title="SH Syntax"> <link rel="next" href="SH-Directives.html#SH-Directives" title="SH Directives"> <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> <!-- This file documents the GNU Assembler "as". Copyright (C) 1991-2015 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''. --> <meta http-equiv="Content-Style-Type" content="text/css"> <style type="text/css"><!-- pre.display { font-family:inherit } pre.format { font-family:inherit } pre.smalldisplay { font-family:inherit; font-size:smaller } pre.smallformat { font-family:inherit; font-size:smaller } pre.smallexample { font-size:smaller } pre.smalllisp { font-size:smaller } span.sc { font-variant:small-caps } span.roman { font-family:serif; font-weight:normal; } span.sansserif { font-family:sans-serif; font-weight:normal; } --></style> </head> <body> <div class="node"> <a name="SH-Floating-Point"></a> <p> Next: <a rel="next" accesskey="n" href="SH-Directives.html#SH-Directives">SH Directives</a>, Previous: <a rel="previous" accesskey="p" href="SH-Syntax.html#SH-Syntax">SH Syntax</a>, Up: <a rel="up" accesskey="u" href="SH_002dDependent.html#SH_002dDependent">SH-Dependent</a> <hr> </div> <h4 class="subsection">9.40.3 Floating Point</h4> <p><a name="index-floating-point_002c-SH-_0028_0040sc_007bieee_007d_0029-1950"></a><a name="index-SH-floating-point-_0028_0040sc_007bieee_007d_0029-1951"></a>SH2E, SH3E and SH4 groups have on-chip floating-point unit (FPU). Other SH groups can use <code>.float</code> directive to generate <span class="sc">ieee</span> floating-point numbers. <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>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. </body></html>