fesetround()
QNX SDP8.0C Library ReferenceAPIDeveloper
Set the floating-point rounding direction
Synopsis:
#include <fenv.h>
int fesetround( int round );
Arguments:
- round
- The rounding direction; one of the following:
- FE_DOWNWARD
- FE_TONEAREST
- FE_TOWARDZERO
- FE_UPWARD
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 fesetround() function sets the current floating-point rounding direction. If the value of round isn't a valid rounding direction macro, the rounding direction isn't changed. The FLT_ROUNDS macro reflects the updated rounding direction.
Returns:
0 on success, or a nonzero value if an error occurred.
Classification:
| Safety: | |
|---|---|
| Cancellation point | No |
| Signal handler | Yes |
| Thread | Yes |
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