fesetprec()
QNX SDP8.0C Library ReferenceAPIDeveloper
Set the floating-point precision
Synopsis:
#include <fenv.h>
int fesetprec( int prec );
Arguments:
- prec
- The new precision; one of the following:
- FE_PREC_SINGLE
- FE_PREC_DOUBLE
- FE_PREC_EXTENDED
Library:
- libm
- The general-purpose math library.
- libm-sve
- A library that optimizes the code for ARMv8.2 chips that have Scalable Vector Extension hardware.
Your system requirements will determine how you should work with these libraries:
- If you want only selected processes to run with the SVE version, you can include both libraries in your OS image and use the -l m or -l m-sve option to qcc to link explicitly against the appropriate one.
- If you want all processes to use the SVE version, include libm-sve.so in your OS image and set up a symbolic link from libm.so to libm-sve.so. Use the -l m option to qcc to link against the library.
Note:
Compile your program with the -fno-builtin option to prevent the compiler from using a
built-in version of the function.
Description:
The fesetprec() function sets the floating-point precision. To get the current precision, call fegetprec().
Returns:
0 on success, or -1 if the prec was invalid.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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