__fpc_rs() — read floating-point control register and change rounding mode field
Standards
| Standards / Extensions | C or C++ | Dependencies |
|---|---|---|
| Both | OS/390® V2R6 |
Syntax
#include <_Ieee754.h>
void __fpc_rs(_FP_fpcreg_t *cur_ptr, _FP_rmode_t rmode);General description
The __fpc_rs() function
stores the current contents of the floating-point control (FPC) register
at the location pointed to by cur_ptr and
then sets the rounding mode field of the FPC based on the value specified
by rmode as follows:
- Value
- Rounding Mode
- _RMODE_RN
- Round to nearest
- _RMODE_RZ
- Round toward zero
- _RMODE_RP
- Round toward +Infinity
- _RMODE_RM
- Round toward -Infinity
Note:
- 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.
- This function does not return or update decimal floating-point rounding mode bits.
Return values
None