Symbian3/PDK/Source/GUID-5E358AB4-03A7-5859-ABF2-A8B64B74AF56.dita
changeset 12 80ef3a206772
parent 5 f345bda72bc4
--- a/Symbian3/PDK/Source/GUID-5E358AB4-03A7-5859-ABF2-A8B64B74AF56.dita	Fri Jul 02 12:51:36 2010 +0100
+++ b/Symbian3/PDK/Source/GUID-5E358AB4-03A7-5859-ABF2-A8B64B74AF56.dita	Fri Jul 16 17:23:46 2010 +0100
@@ -1,41 +1,39 @@
-<?xml version="1.0" encoding="utf-8"?>
-<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
-<!-- This component and the accompanying materials are made available under the terms of the License 
-"Eclipse Public License v1.0" which accompanies this distribution, 
-and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
-<!-- Initial Contributors:
-    Nokia Corporation - initial contribution.
-Contributors: 
--->
-<!DOCTYPE concept
-  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
-<concept id="GUID-5E358AB4-03A7-5859-ABF2-A8B64B74AF56" xml:lang="en"><title>Vector
-Floating Point Architecture (VFP)</title><shortdesc>Describes the implementation of the ARM Vector Floating Point Architecture
-(VFPv2) on Symbian platform. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
-<p>ARM provide a hardware floating point coprocessor that provides floating
-point computation that is fully compliant with IEEE Std 754-1985.We refer
-to the coprocessor as the <i>VFP unit</i>. </p>
-<p>Symbian platform supports the use of VFPv2 on platforms where the required
-hardware is present in both <i>RunFast</i> mode and in <i>IEEE-without-exceptions</i> mode.
-See ARM's Vector Floating-point Coprocessor Technical reference Manual for
-more details on the coprocessor, its architecture, and its execution modes. </p>
-<p>You should read the information in <xref href="GUID-D525B9A9-6B32-535B-A282-60C85A48D3FB.dita">Floating
-point support</xref> about applications and user side code as this is also
-applicable to code running on the kernel side. However there are a number
-of restrictions that must be observed: </p>
-<ul>
-<li id="GUID-2205026D-0E6F-54AE-B74F-5478D6047B70"><p>You <i>cannot</i> use
-VFP instructions in any interrupt service routine. </p> </li>
-<li id="GUID-C8D896E1-CF36-52CD-A984-61D7A8189268"><p>You <i>cannot</i> use
-VFP instructions when the kernel is locked, for example, in an IDFC or after
-calling <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-7CBBF72B-4519-38DD-92CA-38AF636AFD8A"><apiname>NKern::Lock()</apiname></xref>  </p> </li>
-<li id="GUID-A7466A83-A8F2-58CE-AB8B-E05607BB6D95"><p>You <i>cannot</i> use
-VFP instructions in any section of code which runs with a fast mutex held. </p> </li>
-</ul>
-<p>Using VFP instructions in these situations can lead to data being corrupted,
-or the kernel panicking. If you rely on the compiler to generate VFP instructions,
-rather than using inline assembler, it is extremely important that you do
-not use any floating point values in these situations. The compiler may generate
-VFP instructions for the most trivial floating point operations and even for
-simple assignments. </p>
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. -->
+<!-- This component and the accompanying materials are made available under the terms of the License 
+"Eclipse Public License v1.0" which accompanies this distribution, 
+and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". -->
+<!-- Initial Contributors:
+    Nokia Corporation - initial contribution.
+Contributors: 
+-->
+<!DOCTYPE concept
+  PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd">
+<concept id="GUID-5E358AB4-03A7-5859-ABF2-A8B64B74AF56" xml:lang="en"><title>Vector Floating Point Architecture (VFP)</title><shortdesc>Describes the implementation of the ARM Vector Floating
+Point Architecture (VFPv2) on Symbian platform. </shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody>
+<p>ARM provide a hardware floating point coprocessor that provides
+floating point computation that is fully compliant with IEEE Std 754-1985.We
+refer to the coprocessor as the <i>VFP unit</i>. </p>
+<p>Symbian platform supports the use of VFPv2 on platforms where the
+required hardware is present in both <i>RunFast</i> mode and in <i>IEEE-without-exceptions</i> mode. See ARM's Vector Floating-point
+Coprocessor Technical reference Manual for more details on the coprocessor,
+its architecture, and its execution modes. </p>
+<p>You should read Floating point support in Symbian^3 Tools Guide
+&gt; Building. The guide contains information about applications and
+user-side code, which is also applicable to code running
+on the kernel side. However there are a number of restrictions that
+must be observed: </p>
+<ul>
+<li id="GUID-2205026D-0E6F-54AE-B74F-5478D6047B70"><p>You <i>cannot</i> use VFP instructions in any interrupt service routine. </p> </li>
+<li id="GUID-C8D896E1-CF36-52CD-A984-61D7A8189268"><p>You <i>cannot</i> use VFP instructions when the kernel is locked, for example, in
+an IDFC or after calling <xref href="GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02.dita#GUID-3A3C08F3-3D33-3D9E-80E7-7855C7B21E02/GUID-7CBBF72B-4519-38DD-92CA-38AF636AFD8A"><apiname>NKern::Lock()</apiname></xref>  </p> </li>
+<li id="GUID-A7466A83-A8F2-58CE-AB8B-E05607BB6D95"><p>You <i>cannot</i> use VFP instructions in any section of code which runs with a fast
+mutex held. </p> </li>
+</ul>
+<p>Using VFP instructions in these situations can lead to data being
+corrupted, or the kernel panicking. If you rely on the compiler to
+generate VFP instructions, rather than using inline assembler, it
+is extremely important that you do not use any floating point values
+in these situations. The compiler may generate VFP instructions for
+the most trivial floating point operations and even for simple assignments. </p>
 </conbody></concept>
\ No newline at end of file