| /* s_ceill.c -- long double version of s_ceil.c. |
| * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. |
| */ |
| |
| /* |
| * ==================================================== |
| * 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 = 1.0e4930L; |
| #else |
| static long double huge = 1.0e4930L; |
| #endif |
| |
| #ifdef __STDC__ |
| long double __ceill(long double x) |
| #else |
| long double __ceill(x) |
| long double x; |
| #endif |
| { |
| int64_t i0,i1,j0; |
| u_int64_t i,j; |
| GET_LDOUBLE_WORDS64(i0,i1,x); |
| j0 = ((i0>>48)&0x7fff)-0x3fff; |
| if(j0<48) { |
| if(j0<0) { /* raise inexact if x != 0 */ |
| if(huge+x>0.0) {/* return 0*sign(x) if |x|<1 */ |
| if(i0<0) {i0=0x8000000000000000ULL;i1=0;} |
| else if((i0|i1)!=0) { i0=0x3fff000000000000ULL;i1=0;} |
| } |
| } else { |
| i = (0x0000ffffffffffffULL)>>j0; |
| if(((i0&i)|i1)==0) return x; /* x is integral */ |
| if(huge+x>0.0) { /* raise inexact flag */ |
| if(i0>0) i0 += (0x0001000000000000LL)>>j0; |
| i0 &= (~i); i1=0; |
| } |
| } |
| } 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 */ |
| if(huge+x>0.0) { /* raise inexact flag */ |
| if(i0>0) { |
| if(j0==48) i0+=1; |
| else { |
| j = i1+(1LL<<(112-j0)); |
| if(j<i1) i0 +=1 ; /* got a carry */ |
| i1=j; |
| } |
| } |
| i1 &= (~i); |
| } |
| } |
| SET_LDOUBLE_WORDS64(x,i0,i1); |
| return x; |
| } |
| weak_alias (__ceill, ceill) |
