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glibc  2.9
Functions | Variables
s_floorf.c File Reference
#include "math.h"
#include "math_private.h"

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Functions

float __floorf (float x)

Variables

static float huge = 1.0e30

Function Documentation

float __floorf ( float  x)

Definition at line 41 of file s_floorf.c.

{
       int32_t i0,j0;
       u_int32_t i;
       GET_FLOAT_WORD(i0,x);
       j0 = ((i0>>23)&0xff)-0x7f;
       if(j0<23) {
           if(j0<0) {       /* raise inexact if x != 0 */
              if(huge+x>(float)0.0) {/* return 0*sign(x) if |x|<1 */
                  if(i0>=0) {i0=0;} 
                  else if((i0&0x7fffffff)!=0)
                     { i0=0xbf800000;}
              }
           } else {
              i = (0x007fffff)>>j0;
              if((i0&i)==0) return x; /* x is integral */
              if(huge+x>(float)0.0) {     /* raise inexact flag */
                  if(i0<0) i0 += (0x00800000)>>j0;
                  i0 &= (~i);
              }
           }
       } else {
           if(j0==0x80) return x+x;       /* inf or NaN */
           else return x;          /* x is integral */
       }
       SET_FLOAT_WORD(x,i0);
       return x;
}

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Variable Documentation

float huge = 1.0e30 [static]

Definition at line 35 of file s_floorf.c.