ARM Compiler toolchain v4.1 for µVision Using the Compiler
ARM Compiler toolchain v4.1 for µVision Using the Compiler
ARM Compiler toolchain v4.1 for µVision Using the Compiler
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<strong>Compiler</strong> Coding Practices<br />
5.46 <strong>Compiler</strong> and library support <strong>for</strong> half-precision floating-point numbers<br />
Half-precision floating-point numbers are provided as an optional extension to <strong>the</strong> Vector<br />
Floating-Point (VFP)v3 architecture. If <strong>the</strong> VFPv3 coprocessor is not available, or if a VFPv3<br />
coprocessor is used that does not have this extension, <strong>the</strong>y are supported through <strong>the</strong><br />
floating-point library fplib.<br />
Half-precision floating-point numbers can only be used when selected with <strong>the</strong><br />
--fp16_<strong>for</strong>mat=<strong>for</strong>mat compiler command-line option.<br />
The C++ name mangling <strong>for</strong> <strong>the</strong> half-precision data type is specified in <strong>the</strong> C++ generic<br />
Application Binary Interface (ABI).<br />
5.46.1 See also<br />
Concepts<br />
• Half-precision floating-point number <strong>for</strong>mat on page 5-62<br />
• Vector Floating-Point (VFP) architectures on page 5-58.<br />
<strong>Using</strong> <strong>ARM</strong> ® C and C++ Libraries and Floating-Point Support:<br />
• Chapter 4 Floating-point support.<br />
Reference<br />
<strong>Compiler</strong> Reference:<br />
• --fp16_<strong>for</strong>mat=<strong>for</strong>mat on page 3-41.<br />
O<strong>the</strong>r in<strong>for</strong>mation<br />
• C++ ABI <strong>for</strong> <strong>the</strong> <strong>ARM</strong> Architecture,<br />
http://infocenter.arm.com/help/topic/com.arm.doc.ihi0041-/index.html<br />
<strong>ARM</strong> DUI 0375C Copyright © 2007-2008, 2011 <strong>ARM</strong>. All rights reserved. 5-61<br />
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