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

long double __rintl (long double x)

Variables

static long double TWO112 [2]

Function Documentation

long double __rintl ( long double  x)

Definition at line 46 of file s_rintl.c.

{
       int64_t i0,j0,sx;
       u_int64_t i,i1;
       long double w,t;
       GET_LDOUBLE_WORDS64(i0,i1,x);
       sx = (((u_int64_t)i0)>>63);
       j0 = ((i0>>48)&0x7fff)-0x3fff;
       if(j0<48) {
           if(j0<0) {
              if(((i0&0x7fffffffffffffffLL)|i1)==0) return x;
              i1 |= (i0&0x0000ffffffffffffLL);
              i0 &= 0xffffe00000000000ULL;
              i0 |= ((i1|-i1)>>16)&0x0000800000000000LL;
              SET_LDOUBLE_MSW64(x,i0);
               w = TWO112[sx]+x;
               t = w-TWO112[sx];
              GET_LDOUBLE_MSW64(i0,t);
              SET_LDOUBLE_MSW64(t,(i0&0x7fffffffffffffffLL)|(sx<<63));
               return t;
           } else {
              i = (0x0000ffffffffffffLL)>>j0;
              if(((i0&i)|i1)==0) return x; /* x is integral */
              i>>=1;
              if(((i0&i)|i1)!=0) {
                  if(j0==47) i1 = 0x4000000000000000ULL; else
                  i0 = (i0&(~i))|((0x0000200000000000LL)>>j0);
              }
           }
       } else if (j0>111) {
           if(j0==0x4000) return x+x;     /* inf or NaN */
           else return x;          /* x is integral */
       } else {
           i = -1ULL>>(j0-48);
           if((i1&i)==0) return x; /* x is integral */
           i>>=1;
           if((i1&i)!=0) i1 = (i1&(~i))|((0x4000000000000000LL)>>(j0-48));
       }
       SET_LDOUBLE_WORDS64(x,i0,i1);
       w = TWO112[sx]+x;
       return w-TWO112[sx];
}

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Variable Documentation

long double TWO112[2] [static]
Initial value:
{
  5.19229685853482762853049632922009600E+33L, 
 -5.19229685853482762853049632922009600E+33L  
}

Definition at line 38 of file s_rintl.c.