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diff --git a/libs/context/doc/html/context/rationale/x86_and_floating_point_env.html b/libs/context/doc/html/context/rationale/x86_and_floating_point_env.html new file mode 100644 index 0000000000..a2118af85c --- /dev/null +++ b/libs/context/doc/html/context/rationale/x86_and_floating_point_env.html @@ -0,0 +1,124 @@ +<html> +<head> +<meta http-equiv="Content-Type" content="text/html; charset=US-ASCII"> +<title>x86 and floating-point env</title> +<link rel="stylesheet" href="../../../../../../doc/src/boostbook.css" type="text/css"> +<meta name="generator" content="DocBook XSL Stylesheets V1.76.1"> +<link rel="home" href="../../index.html" title="Context"> +<link rel="up" href="../rationale.html" title="Rationale"> +<link rel="prev" href="other_apis_.html" title="Other APIs"> +<link rel="next" href="../reference.html" title="Reference"> +</head> +<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> +<table cellpadding="2" width="100%"><tr> +<td valign="top"><img alt="Boost C++ Libraries" width="277" height="86" src="../../../../../../boost.png"></td> +<td align="center"><a href="../../../../../../index.html">Home</a></td> +<td align="center"><a href="../../../../../../libs/libraries.htm">Libraries</a></td> +<td align="center"><a href="http://www.boost.org/users/people.html">People</a></td> +<td align="center"><a href="http://www.boost.org/users/faq.html">FAQ</a></td> +<td align="center"><a href="../../../../../../more/index.htm">More</a></td> +</tr></table> +<hr> +<div class="spirit-nav"> +<a accesskey="p" href="other_apis_.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> +</div> +<div class="section"> +<div class="titlepage"><div><div><h3 class="title"> +<a name="context.rationale.x86_and_floating_point_env"></a><a class="link" href="x86_and_floating_point_env.html" title="x86 and floating-point env">x86 and + floating-point env</a> +</h3></div></div></div> +<h5> +<a name="context.rationale.x86_and_floating_point_env.h0"></a> + <span><a name="context.rationale.x86_and_floating_point_env.i386"></a></span><a class="link" href="x86_and_floating_point_env.html#context.rationale.x86_and_floating_point_env.i386">i386</a> + </h5> +<p> + "The FpCsr and the MxCsr register must be saved and restored before + any call or return by any procedure that needs to modify them ..." + <sup>[<a name="context.rationale.x86_and_floating_point_env.f0" href="#ftn.context.rationale.x86_and_floating_point_env.f0" class="footnote">4</a>]</sup>. + </p> +<h5> +<a name="context.rationale.x86_and_floating_point_env.h1"></a> + <span><a name="context.rationale.x86_and_floating_point_env.x86_64"></a></span><a class="link" href="x86_and_floating_point_env.html#context.rationale.x86_and_floating_point_env.x86_64">x86_64</a> + </h5> +<h5> +<a name="context.rationale.x86_and_floating_point_env.h2"></a> + <span><a name="context.rationale.x86_and_floating_point_env.windows"></a></span><a class="link" href="x86_and_floating_point_env.html#context.rationale.x86_and_floating_point_env.windows">Windows</a> + </h5> +<p> + MxCsr - "A callee that modifies any of the nonvolatile fields within + MxCsr must restore them before returning to its caller. Furthermore, a caller + that has modified any of these fields must restore them to their standard + values before invoking a callee ..." <sup>[<a name="context.rationale.x86_and_floating_point_env.f1" href="#ftn.context.rationale.x86_and_floating_point_env.f1" class="footnote">5</a>]</sup>. + </p> +<p> + FpCsr - "A callee that modifies any of the fields within FpCsr must + restore them before returning to its caller. Furthermore, a caller that has + modified any of these fields must restore them to their standard values before + invoking a callee ..." <sup>[<a name="context.rationale.x86_and_floating_point_env.f2" href="#ftn.context.rationale.x86_and_floating_point_env.f2" class="footnote">6</a>]</sup>. + </p> +<p> + "The MMX and floating-point stack registers (MM0-MM7/ST0-ST7) are preserved + across context switches. There is no explicit calling convention for these + registers." <sup>[<a name="context.rationale.x86_and_floating_point_env.f3" href="#ftn.context.rationale.x86_and_floating_point_env.f3" class="footnote">7</a>]</sup>. + </p> +<p> + "The 64-bit Microsoft compiler does not use ST(0)-ST(7)/MM0-MM7". + <sup>[<a name="context.rationale.x86_and_floating_point_env.f4" href="#ftn.context.rationale.x86_and_floating_point_env.f4" class="footnote">8</a>]</sup>. + </p> +<p> + "XMM6-XMM15 must be preserved" <sup>[<a name="context.rationale.x86_and_floating_point_env.f5" href="#ftn.context.rationale.x86_and_floating_point_env.f5" class="footnote">9</a>]</sup> + </p> +<h5> +<a name="context.rationale.x86_and_floating_point_env.h3"></a> + <span><a name="context.rationale.x86_and_floating_point_env.sysv"></a></span><a class="link" href="x86_and_floating_point_env.html#context.rationale.x86_and_floating_point_env.sysv">SysV</a> + </h5> +<p> + "The control bits of the MxCsr register are callee-saved (preserved + across calls), while the status bits are caller-saved (not preserved). The + x87 status word register is caller-saved, whereas the x87 control word (FpCsr) + is callee-saved." <sup>[<a name="context.rationale.x86_and_floating_point_env.f6" href="#ftn.context.rationale.x86_and_floating_point_env.f6" class="footnote">10</a>]</sup>. + </p> +<div class="footnotes"> +<br><hr width="100" align="left"> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f0" href="#context.rationale.x86_and_floating_point_env.f0" class="para">4</a>] </sup> + 'Calling Conventions', Agner Fog + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f1" href="#context.rationale.x86_and_floating_point_env.f1" class="para">5</a>] </sup> + <a href="http://http://msdn.microsoft.com/en-us/library/yxty7t75.aspx" target="_top">MSDN + article 'MxCsr'</a> + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f2" href="#context.rationale.x86_and_floating_point_env.f2" class="para">6</a>] </sup> + <a href="http://http://msdn.microsoft.com/en-us/library/ms235300.aspx" target="_top">MSDN + article 'FpCsr'</a> + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f3" href="#context.rationale.x86_and_floating_point_env.f3" class="para">7</a>] </sup> + <a href="http://msdn.microsoft.com/en-us/library/a32tsf7t%28VS.80%29.aspx" target="_top">MSDN + article 'Legacy Floating-Point Support'</a> + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f4" href="#context.rationale.x86_and_floating_point_env.f4" class="para">8</a>] </sup> + 'Calling Conventions', Agner Fog + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f5" href="#context.rationale.x86_and_floating_point_env.f5" class="para">9</a>] </sup> + <a href="http://msdn.microsoft.com/en-us/library/9z1stfyw%28v=vs.100%29.aspx" target="_top">MSDN + article 'Register Usage'</a> + </p></div> +<div class="footnote"><p><sup>[<a id="ftn.context.rationale.x86_and_floating_point_env.f6" href="#context.rationale.x86_and_floating_point_env.f6" class="para">10</a>] </sup> + SysV ABI AMD64 Architecture Processor Supplement Draft Version 0.99.4, + 3.2.1 + </p></div> +</div> +</div> +<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr> +<td align="left"></td> +<td align="right"><div class="copyright-footer">Copyright © 2009 Oliver Kowalke<p> + Distributed under the Boost Software License, Version 1.0. (See accompanying + file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>) + </p> +</div></td> +</tr></table> +<hr> +<div class="spirit-nav"> +<a accesskey="p" href="other_apis_.html"><img src="../../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../rationale.html"><img src="../../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../../index.html"><img src="../../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="../reference.html"><img src="../../../../../../doc/src/images/next.png" alt="Next"></a> +</div> +</body> +</html> |