newlib/libm/mathfp/sf_floor.c

   1
   2 /* @(#)z_floorf.c 1.0 98/08/13 */
   3 /*****************************************************************
   4  * floor
   5  *
   6  * Input:
   7  *   x  - floating point value
   8  *
   9  * Output:
  10  *   Smallest integer less than x.
  11  *
  12  * Description:
  13  *   This routine returns the smallest integer less than x.
  14  *
  15  *****************************************************************/
  16
  17 #include "fdlibm.h"
  18 #include "zmath.h"
  19
  20 float
  21 floorf (float x)
  22 {
  23   float f, y;
  24
  25   if (x > -1.0 && x < 1.0)
  26     return (x >= 0 ? 0 : -1.0);
  27
  28   y = modff (x, &f);
  29
  30   if (y == 0.0)
  31     return (x);
  32
  33   return (x >= 0 ? f : f - 1.0);
  34 }
  35
  36 #ifdef _DOUBLE_IS_32BITS
  37 double floor (double x)
  38 {
  39   return (double) floorf ((float) x);
  40 }
  41
  42 #endif /* defined(_DOUBLE_IS_32BITS) */