__fpc_rw() — read and write the floating-point control register

Standards

Standards / Extensions C or C++ Dependencies
  Both OS/390® V2R6

Syntax

#include <_Ieee754.h>
void __fpc_rw(_FP_fpcreg_t *cur_ptr, _FP_fpcreg_t *new_ptr);

General description

The __fpc_rw() function stores the current contents of the floating-point control (FPC) register at the location pointed to by cur_ptr and then replaces the contents of the floating-point control (FPC) register with the value pointed to by new_ptr.

Note:
  1. When processing IEEE floating-point values, the C/C++ runtime library math functions require IEEE rounding mode of round to nearest. The C/C++ runtime library takes care of setting round to nearest rounding mode while executing math functions and restoring application rounding mode before returning to the caller.
  2. This function does not return or update decimal floating-point rounding mode bits.

Return values

None

Related information

Parent topic: IEEE floating-point functions