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  • Committer: Package Import Robot
  • Author(s): Matthias Klose
  • Date: 2011-10-04 17:48:26 UTC
  • mfrom: (216.1.23 oneiric)
  • Revision ID: package-import@ubuntu.com-20111004174826-2cyb9ewn3ucymlsx
Tags: 2.13-20ubuntu5
https://launchpad.net/bugs/853688
libc6-dev: Don't break the current {gnat,gcj}-4.4-base versons. LP: #853688.

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sysdeps/ieee754/dbl-64/s_ceil.c
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 * ====================================================
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 */
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#if defined(LIBM_SCCS) && !defined(lint)
 
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static char rcsid[] = "$NetBSD: s_ceil.c,v 1.8 1995/05/10 20:46:53 jtc Exp $";
 
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#endif
 
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/*
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 * ceil(x)
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 * Return x rounded toward -inf to integral value
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#include "math.h"
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#include "math_private.h"
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#ifdef __STDC__
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static const double huge = 1.0e300;
 
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#else
 
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static double huge = 1.0e300;
 
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#endif
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double
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__ceil(double x)
 
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#ifdef __STDC__
 
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        double __ceil(double x)
 
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#else
 
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        double __ceil(x)
 
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        double x;
 
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#endif
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{
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        int32_t i0,i1,j0;
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        u_int32_t i,j;
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        EXTRACT_WORDS(i0,i1,x);
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        j0 = ((i0>>20)&0x7ff)-0x3ff;
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        if(j0<20) {
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            if(j0<0) {  /* raise inexact if x != 0 */
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                math_force_eval(huge+x);
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                /* return 0*sign(x) if |x|<1 */
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                if(i0<0) {i0=0x80000000;i1=0;}
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                else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
 
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            if(j0<0) {  /* raise inexact if x != 0 */
 
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                if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
 
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                    if(i0<0) {i0=0x80000000;i1=0;}
 
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                    else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
 
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                }
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            } else {
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                i = (0x000fffff)>>j0;
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                if(((i0&i)|i1)==0) return x; /* x is integral */
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                math_force_eval(huge+x);        /* raise inexact flag */
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                if(i0>0) i0 += (0x00100000)>>j0;
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                i0 &= (~i); i1=0;
 
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                if(huge+x>0.0) {        /* raise inexact flag */
 
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                    if(i0>0) i0 += (0x00100000)>>j0;
 
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                    i0 &= (~i); i1=0;
 
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                }
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            }
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        } else if (j0>51) {
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            if(j0==0x400) return x+x;   /* inf or NaN */
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        } else {
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            i = ((u_int32_t)(0xffffffff))>>(j0-20);
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            if((i1&i)==0) return x;     /* x is integral */
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            math_force_eval(huge+x);            /* raise inexact flag */
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            if(i0>0) {
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                if(j0==20) i0+=1;
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                else {
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                    j = i1 + (1<<(52-j0));
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                    if(j<i1) i0+=1;     /* got a carry */
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                    i1 = j;
 
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            if(huge+x>0.0) {            /* raise inexact flag */
 
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                if(i0>0) {
 
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                    if(j0==20) i0+=1;
 
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                    else {
 
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                        j = i1 + (1<<(52-j0));
 
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                        if(j<i1) i0+=1; /* got a carry */
 
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                        i1 = j;
 
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                    }
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                }
 
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                i1 &= (~i);
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            }
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            i1 &= (~i);
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        }
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        INSERT_WORDS(x,i0,i1);
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        return x;
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}
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#ifndef __ceil
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weak_alias (__ceil, ceil)
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# ifdef NO_LONG_DOUBLE
 
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#ifdef NO_LONG_DOUBLE
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strong_alias (__ceil, __ceill)
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weak_alias (__ceil, ceill)
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# endif
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#endif