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SunOS 5.10 - man page for fesetprec (sunos section 3m)

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

fesetprec, fegetprec - control floating point rounding precision modes
cc [ flag... ] file... -lm [ library... ] #include <fenv.h> int fesetprec(int prec); int fegetprec(void);
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.
The fesetprec() function returns a non-zero value if the requested rounding precision is established and 0 otherwise.
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.
fegetenv(3M), fesetround(3M), attributes(5) Numerical Computation Guide SunOS 5.10 1 Oct 2003 fesetprec(3M)