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fesetprec(3m) [sunos man page]

fesetprec(3M)						  Mathematical Library Functions					     fesetprec(3M)

NAME
fesetprec, fegetprec - control floating point rounding precision modes SYNOPSIS
cc [ flag... ] file... -lm [ library... ] #include <fenv.h> int fesetprec(int prec); int fegetprec(void); DESCRIPTION
The IEEE 754 standard defines rounding precision modes for systems that always deliver intermediate results to destinations in extended double precision format. These modes allow such systems to deliver correctly rounded single and double precision results (in the absence of underflow and overflow) with only one rounding. The fesetprec() function sets the current rounding precision to the precision specified by prec, which must be one of the following values defined in <fenv.h>: FE_FLTPREC round to single precision FE_DBLPREC round to double precision FE_LDBLPREC round to extended double precision The default rounding precision when a program starts is FE_LDBLPREC. The fegetprec() function returns the current rounding precision. RETURN VALUES
The fesetprec() function returns a non-zero value if the requested rounding precision is established and 0 otherwise. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | |Architecture |Intel (see below) | |Availability |SUNWlibms | |Interface Stability |Stable | |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ These functions are not available on SPARC systems because SPARC processors deliver intermediate results to destinations in single or dou- ble format as determined by each floating point instruction. SEE ALSO
fegetenv(3M), fesetround(3M), attributes(5) Numerical Computation Guide SunOS 5.10 1 Oct 2003 fesetprec(3M)

Check Out this Related Man Page

FPGETMASK(3)						   BSD Library Functions Manual 					      FPGETMASK(3)

NAME
fpgetmask, fpgetprec, fpgetround, fpgetsticky, fpsetmask, fpsetprec, fpsetround, fpsetsticky -- IEEE FP mode control LIBRARY
Standard C Library (libc, -lc) SYNOPSIS
#include <ieeefp.h> fp_except_t fpgetmask(void); fp_prec_t fpgetprec(void); fp_rnd_t fpgetround(void); fp_except_t fpgetsticky(void); fp_except_t fpsetmask(fp_except_t mask); fp_prec_t fpsetprec(fp_prec_t prec); fp_rnd_t fpsetround(fp_rnd_t rnd_dir); fp_except_t fpsetsticky(fp_except_t sticky); DESCRIPTION
A rounding mode fp_rnd_t is one of: FP_RZ rounding towards zero FP_RM rounding down to (Minus infinity) FP_RN rounding to nearest FP_RP rounding down to (Plus infinity) The default mode is FP_RN. An fp_except_t value is a bitmask specifying an exception type and containing any of the values listed below. FP_X_INV Invalid Operation FP_X_DZ Division by zero FP_X_OFL Overflow FP_X_UFL Underflow FP_X_IMP Imprecision (inexact) FP_X_IOV Integer Overflow An fp_prec_t specifies the precision of the floating point operations listed below. FP_PS 24 bit (single-precision) FP_PRS reserved FP_PD 53 bit (double-precision) FP_PE 64 bit (extended-precision) The fpsetmask() function will set the current exception mask, i.e., it will cause future operations with the specified result status to raise the SIGFPE exception. The fpgetmask() function will return the current exception mask. The fpgetprec() function will return the current floating point precision. The fpsetprec() function will set the floating point precision and will return the previous precision. The fpsetround() function will cause future operations to use the specified dynamic rounding mode. The fpgetround() function will return the current rounding mode. Note: On some architectures, instructions can optionally specify static rounding modes and exception enables that will supersede the speci- fied dynamic mode. On other architectures, these features may not be fully supported. A ``sticky'' status word may be maintained in which a bit is set every time an exceptional floating point condition is encountered, whether or not a SIGFPE is generated. The fpsetsticky() function will set or clear the specified exception history bits. The fpgetsticky() function will return the exception history bits. RETURN VALUES
The fpgetround() and fpsetround() functions return the (previous) rounding mode. The fpgetmask(), fpsetmask(), fpgetsticky(), and fpsetsticky() functions return the (previous) exception mask and exception history bits. SEE ALSO
sigaction(2), fenv(3) BUGS
There is no way to return an unsupported value. Not all processors support all the modes. These interfaces are deprecated and the ones in fenv(3) should be used, although the interfaces in fenv(3) don't support getting or setting the precision. BSD
March 26, 2011 BSD

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