author | Dominic Pinkman <Dominic.Pinkman@Nokia.com> |
Fri, 22 Jan 2010 18:26:19 +0000 | |
changeset 1 | 25a17d01db0c |
child 3 | 46218c8b8afa |
permissions | -rw-r--r-- |
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Addition of the PDK content and example code for Documentation_content according to Feature bug 1607 and bug 1608
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<?xml version="1.0" encoding="utf-8"?> |
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<!-- Copyright (c) 2007-2010 Nokia Corporation and/or its subsidiary(-ies) All rights reserved. --> |
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<!-- This component and the accompanying materials are made available under the terms of the License |
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"Eclipse Public License v1.0" which accompanies this distribution, |
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and is available at the URL "http://www.eclipse.org/legal/epl-v10.html". --> |
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<!-- Initial Contributors: |
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Nokia Corporation - initial contribution. |
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Contributors: |
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--> |
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<!DOCTYPE concept |
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PUBLIC "-//OASIS//DTD DITA Concept//EN" "concept.dtd"> |
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<concept id="GUID-CBC1E46A-E254-5A01-86AE-F5EB6135E3E3" xml:lang="en"><title>Vector |
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Floating Point (VFP)</title><shortdesc>ARM provide a hardware floating point coprocessor that provides |
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floating point computation that is fully compliant with IEEE Std 754-1985.</shortdesc><prolog><metadata><keywords/></metadata></prolog><conbody> |
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<p> When a phone has this hardware, the base port must be configured to use |
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it. </p> |
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<p>The ARM architecture is called the ARM Vector Floating Point Architecture |
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(VFPv2), and the coprocessor is also called the <i>VFP unit</i>. </p> |
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<p>Symbian platform supports the use of VFPv2 on platforms where the required |
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hardware is present in both <i>RunFast</i> mode and in <i>IEEE-without-exceptions</i> mode. |
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See ARM's Vector Floating-point Coprocessor Technical reference Manual for |
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more details on the coprocessor, its architecture, and its execution modes. </p> |
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<p>Applications and, in a more limited sense, kernel side code can use VFP |
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in one of two ways: </p> |
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<ul> |
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<li id="GUID-D74E3541-3D8F-5338-A488-E40385D1C293"><p>indirectly through the |
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use of floating point support (helper) functions generated by the compiler. </p> </li> |
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<li id="GUID-7316F251-5292-510C-9496-30C0B7A7A25C"><p>directly, either through |
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instructions generated by the compiler, or hand-written instructions written |
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in assembler. </p> </li> |
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</ul> |
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<p>An application uses the <codeph>armfpu</codeph> statement in its <filepath>.mmp</filepath> file |
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to specify how it wants floating point to be handled. By choosing to use the |
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floating point support functions, an application does not need to know how |
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they are implemented or even whether these functions make use of a VFP unit. |
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However, if a device does have a VFP unit, then the base port needs to replace |
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the default floating point support functions with VFP-enabled functions if |
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applications are to take advantage of the hardware. </p> |
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</conbody><related-links> |
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<link href="GUID-D525B9A9-6B32-535B-A282-60C85A48D3FB.dita"><linktext>Floating |
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point support</linktext></link> |
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<link href="GUID-3046453A-AB3A-5491-87A0-00F3514D4768.dita"><linktext>Vector Floating |
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Point Implementation Tutorial</linktext></link> |
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</related-links></concept> |