fp_read_rnd() — Determine rounding mode

Standards

Standards / Extensions	C or C++	Dependencies
	both	OS/390 V2R6

Format

#define _AIX_COMPATIBILITY 1
#include <float.h>

fprnd_t fp_read_rnd(void);

General description

For an application running in binary floating-point mode, the fp_read_rnd() function returns the current rounding mode indicated by the rounding mode field of the floating-point control (FPC) register. For an application running in hexadecimal floating-point mode, fp_read_rnd() returns 0.

Note: This function will not return or update decimal floating-point rounding mode bits.

Returned value

For an application running in IEEE Binary Floating-Point mode, fp_read_rnd() returns the following:

Value: Rounding Mode
_FP_RND_RZ: Round toward 0
_FP_RND_RN: Round to nearest
_FP_RND_RP: Round toward +infinity
_FP_RND_RM: Round toward -infinity

For an application running in hexadecimal floating-point mode, fp_read_rnd() returns 0.

Related information

float.h
fp_swap_rnd() — Swap rounding mode
__isBFP() — Determine application floating-point format