ARM Compiler toolchain v4.1 for µVision Using the Compiler

Compiler Coding Practices
5.41 Default selection of hardware or software floating-point support
The default target FPU architecture is derived from use of the --cpu option.
If the CPU specified with --cpu has a VFP coprocessor, the default target FPU architecture is
the VFP architecture for that CPU. For example, the option --cpu=Cortex-R4F implies the option
--fpu=VFPv3_D16.
If a VFP coprocessor is present, VFP instructions are generated. If there is no VFP coprocessor,
the compiler generates code that makes calls to the software floating-point library fplib to carry
out floating-point operations. fplib is available as part of the standard distribution of the ARM
compilation tools suite of C libraries.
5.41.1 See also
Concepts
• Compiler support for floating-point arithmetic on page 5-53.
Using ARM ® C and C++ Libraries and Floating-Point Support:
• Chapter 4 Floating-point support.
ARM DUI 0375C Copyright © 2007-2008, 2011 ARM. All rights reserved. 5-55
ID061811
Non-Confidential