diff options
Diffstat (limited to 'sysdeps/libm-ieee754/s_ceill.c')
| -rw-r--r-- | sysdeps/libm-ieee754/s_ceill.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_ceill.c b/sysdeps/libm-ieee754/s_ceill.c new file mode 100644 index 0000000000..c5c86487ea --- /dev/null +++ b/sysdeps/libm-ieee754/s_ceill.c @@ -0,0 +1,89 @@ +/* s_ceill.c -- long double version of s_ceil.c. + * Conversion to long double by Ulrich Drepper, + * Cygnus Support, drepper@cygnus.com. + */ + +/* + * ==================================================== + * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. + * + * Developed at SunPro, a Sun Microsystems, Inc. business. + * Permission to use, copy, modify, and distribute this + * software is freely granted, provided that this notice + * is preserved. + * ==================================================== + */ + +#if defined(LIBM_SCCS) && !defined(lint) +static char rcsid[] = "$NetBSD: $"; +#endif + +/* + * ceill(x) + * Return x rounded toward -inf to integral value + * Method: + * Bit twiddling. + * Exception: + * Inexact flag raised if x not equal to ceil(x). + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ +static const long double huge = 1.0e4930; +#else +static long double huge = 1.0e4930; +#endif + +#ifdef __STDC__ + long double __ceill(long double x) +#else + long double __ceill(x) + long double x; +#endif +{ + int32_t i1,j0; + u_int32_t i,j,se,i0,sx; + GET_LDOUBLE_WORDS(se,i0,i1,x); + sx = (se>>15)&1; + j0 = (se&0x7fff)-0x3fff; + if(j0<32) { + if(j0<0) { /* raise inexact if x != 0 */ + if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */ + if(sx) {es=0x8000;i0=0;i1=0;} + else if((i0|i1)!=0) { es=0x3fff;i0=0;i1=0;} + } + } else { + i = (0xffffffff)>>j0; + if(((i0&i)|i1)==0) return x; /* x is integral */ + if(huge+x>0.0) { /* raise inexact flag */ + if(sx==0) { + if (j0>0) i0 += (0x80000000)>>(j0-1); + else ++se; + } + i0 &= (~i); i1=0; + } + } + } else if (j0>63) { + if(j0==0x4000) return x+x; /* inf or NaN */ + else return x; /* x is integral */ + } else { + i = ((u_int32_t)(0xffffffff))>>(j0-32); + if((i1&i)==0) return x; /* x is integral */ + if(huge+x>0.0) { /* raise inexact flag */ + if(sx==0) { + if(j0==32) i0+=1; + else { + j = i1 + (1<<(64-j0)); + if(j<i1) i0+=1; /* got a carry */ + i1 = j; + } + } + i1 &= (~i); + } + } + SET_LDOUBLE_WORDS(x,se,i0,i1); + return x; +} +weak_alias (__ceill, ceill) |