lib/i386/math/fegetround.c

   1 #include <assert.h>
   2 #include <fenv.h>
   3
   4 #include "fpu_cw.h"
   5
   6 int fegetround(void)
   7 {
   8         u16_t cw;
   9
  10         /* read and categorize FPUCW */
  11         cw = fpu_cw_get();
  12         switch (cw & FPUCW_ROUNDING_CONTROL)
  13         {
  14                 case FPUCW_ROUNDING_CONTROL_NEAREST: return FE_TONEAREST;
  15                 case FPUCW_ROUNDING_CONTROL_DOWN:    return FE_DOWNWARD;
  16                 case FPUCW_ROUNDING_CONTROL_UP:      return FE_UPWARD;
  17                 case FPUCW_ROUNDING_CONTROL_TRUNC:   return FE_TOWARDZERO;
  18         }
  19
  20         /* each case has been handled, otherwise the constants are wrong */
  21         assert(0);
  22         return -1;
  23 }