| #include <fenv.h> | |
| /* 7.6.3.2 | |
| The fesetround function establishes the rounding direction | |
| represented by its argument round. If the argument is not equal | |
| to the value of a rounding direction macro, the rounding direction | |
| is not changed. */ | |
| int fesetround (int mode) | |
| { | |
| unsigned short _cw; | |
| if ((mode & ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO)) | |
| != 0) | |
| return -1; | |
| __asm__ volatile ("fnstcw %0;": "=m" (_cw)); | |
| _cw &= ~(FE_TONEAREST | FE_DOWNWARD | FE_UPWARD | FE_TOWARDZERO); | |
| _cw |= mode; | |
| __asm__ volatile ("fldcw %0;" : : "m" (_cw)); | |
| return 0; | |
| } |