ARM VERSION 1.2 Scheda Tecnica Scaricare il pdf (Pagina 213)

Floating-point Support

The exception macros are bit fields. The macro

FE_ALL_EXCEPT

is the bitwise OR of all

of them.

Handling exception flags

C9X provides three functions to clear, test and raise exceptions:

void feclearexcept(int excepts);

int fetestexcept(int excepts);

void feraiseexcept(int excepts);

The

feclearexcept

function clears the sticky flags for the given exceptions. The

fetestexcept

function returns the bitwise OR of the sticky flags for the given exceptions

(so that if the Overflow flag was set but the Underflow flag was not, then calling

fetestexcept(FE_OVERFLOW|FE_UNDERFLOW)

would return

FE_OVERFLOW

The

feraiseexcept

function raises the given exceptions, in unspecified order. If an

exception trap is enabled for an exception raised this way, it is called.

C9X also provides functions to save and restore everything about a given exception.

This includes the sticky flag, whether the exception is trapped, and the address of the

trap handler, if any. These functions are:

void fegetexceptflag(fexcept_t *flagp, int excepts);

void fesetexceptflag(const fexcept_t *flagp, int excepts);

The

fegetexceptflag

function copies all the information relating to the given exceptions

into the

fexcept_t

variable provided. The

fesetexceptflag

function copies all the

information relating to the given exceptions from the

fexcept_t

variable into the current

floating-point environment.

Note

fesetexceptflag

can be used to set the sticky flag of a trapped exception to 1 without

calling the trap handler, whereas

feraiseexcept

calls the trap handler for any trapped

exception.

Handling rounding modes

C9X provides two functions for controlling rounding modes:

int fegetround(void);

int fesetround(int round);

1 2 ... 208 209 210 211 212 213 214 215 216 217 218 ... 275 276

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