Akos Kiss
397dff81ee
Keep IEEE code paths only:
* removed SVID, XOPEN, POSIX code paths from everywhere.
* deleted s_lib_version.c, as version is only useful if multiple
standards are supported.
* deleted k_standard.c, as it handles non-IEEE exception cases only.
* renamed the e_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c sources as
s_.*, dropped the __ieee754_ prefix from the names of the
appropriate functions therein, and deleted the
w_{acos,asin,atan2,exp,fmod,log,pow,sqrt}.c wrapper code.
Keep C99 declaration variants only:
* removed old C-style function declaration variants.
* removed data declaration variants where const qualifier was not
used.
Clean unused sources/functions:
* removed s_{rint,significand,tanh}.c and the appropriate functions
defined therein.
JerryScript-DCO-1.0-Signed-off-by: Akos Kiss akiss@inf.u-szeged.hu
70 lines
1.6 KiB
C
70 lines
1.6 KiB
C
|
|
/* @(#)s_ceil.c 1.3 95/01/18 */
|
|
/*
|
|
* ====================================================
|
|
* Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
|
|
*
|
|
* Developed at SunSoft, a Sun Microsystems, Inc. business.
|
|
* Permission to use, copy, modify, and distribute this
|
|
* software is freely granted, provided that this notice
|
|
* is preserved.
|
|
* ====================================================
|
|
*/
|
|
|
|
/*
|
|
* ceil(x)
|
|
* Return x rounded toward -inf to integral value
|
|
* Method:
|
|
* Bit twiddling.
|
|
* Exception:
|
|
* Inexact flag raised if x not equal to ceil(x).
|
|
*/
|
|
|
|
#include "fdlibm.h"
|
|
|
|
static const double huge = 1.0e300;
|
|
|
|
double ceil(double x)
|
|
{
|
|
int i0,i1,j0;
|
|
unsigned i,j;
|
|
i0 = __HI(x);
|
|
i1 = __LO(x);
|
|
j0 = ((i0>>20)&0x7ff)-0x3ff;
|
|
if(j0<20) {
|
|
if(j0<0) { /* raise inexact if x != 0 */
|
|
if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */
|
|
if(i0<0) {i0=0x80000000;i1=0;}
|
|
else if((i0|i1)!=0) { i0=0x3ff00000;i1=0;}
|
|
}
|
|
} else {
|
|
i = (0x000fffff)>>j0;
|
|
if(((i0&i)|i1)==0) return x; /* x is integral */
|
|
if(huge+x>0.0) { /* raise inexact flag */
|
|
if(i0>0) i0 += (0x00100000)>>j0;
|
|
i0 &= (~i); i1=0;
|
|
}
|
|
}
|
|
} else if (j0>51) {
|
|
if(j0==0x400) return x+x; /* inf or NaN */
|
|
else return x; /* x is integral */
|
|
} else {
|
|
i = ((unsigned)(0xffffffff))>>(j0-20);
|
|
if((i1&i)==0) return x; /* x is integral */
|
|
if(huge+x>0.0) { /* raise inexact flag */
|
|
if(i0>0) {
|
|
if(j0==20) i0+=1;
|
|
else {
|
|
j = i1 + (1<<(52-j0));
|
|
if(j<i1) i0+=1; /* got a carry */
|
|
i1 = j;
|
|
}
|
|
}
|
|
i1 &= (~i);
|
|
}
|
|
}
|
|
__HI(x) = i0;
|
|
__LO(x) = i1;
|
|
return x;
|
|
}
|