minix/lib/libc/arch/i386/math/fegetround.c

23 lines
525 B
C

#include <assert.h>
#include <fenv.h>
#include "fpu_cw.h"
int fegetround(void)
{
u16_t cw;
/* read and categorize FPUCW */
cw = fpu_cw_get();
switch (cw & FPUCW_ROUNDING_CONTROL)
{
case FPUCW_ROUNDING_CONTROL_NEAREST: return FE_TONEAREST;
case FPUCW_ROUNDING_CONTROL_DOWN: return FE_DOWNWARD;
case FPUCW_ROUNDING_CONTROL_UP: return FE_UPWARD;
case FPUCW_ROUNDING_CONTROL_TRUNC: return FE_TOWARDZERO;
}
/* each case has been handled, otherwise the constants are wrong */
assert(0);
return -1;
}