ARM Compiler toolchain Using ARM C and C++ Libraries and Floating-Point Support: C99 rounding mode and floating-point exception macros

ARM Compiler toolchain Using ARM C and C++ Libraries and Floating-Point Support

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C99 rounding mode and floating-point exception macros

Note

The following functionality requires you to select a floating-point model that supports exceptions, such as --fpmode=ieee_full or --fpmode=ieee_fixed.

C99 defines a macro for each rounding mode and each exception. The macros are:

FE_DIVBYZERO
FE_INEXACT
FE_INVALID
FE_OVERFLOW
FE_UNDERFLOW
FE_ALL_EXCEPT
FE_DOWNWARD
FE_TONEAREST
FE_TOWARDZERO
FE_UPWARD.

The exception macros are bit fields. The macro FE_ALL_EXCEPT is the bitwise OR of all of them.

See also

Concepts

C99-compatible functions for controlling the ARM floating-point environment.

Reference

Compiler Reference:

--fpmode=model.

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