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k - libraries_user_guide ARM Compiler ARM C and C++ Libraries and Floating-Point Support User Guide
Floating-point Support Functions
ARM Compiler ARM C and C++ Libraries and Floating-Point Support User Guide Version 5.05
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Floating-point Support Functions topics
Describes ARM support for floating-point computations.
Defined in float.h, the _clearfp() function is provided for compatibility with Microsoft products.
Defined in float.h, the _controlfp() function is provided for compatibility with Microsoft products. It enables you to control exception traps and rounding modes.
Some older versions of the ARM libraries implemented a function called __fp_status() that manipulated a status word in the floating-point environment.
The gamma() and gamma_r() functions both compute the logarithm of the gamma function. They are synonyms for lgamma and lgamma_r.
The ARM® Compiler toolchain supports an interface to the status word in the floating-point environment. This interface is provided as function __ieee_status() and it is generally the most efficient function to use for modifying the status word for VFP.