1 /* s_ceill.c -- long double version of s_ceil.c. 2 * Conversion to IEEE quad long double by Jakub Jelinek, jj@ultra.linux.cz. 3 */ 4 5 /* 6 * ==================================================== 7 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. 8 * 9 * Developed at SunPro, a Sun Microsystems, Inc. business. 10 * Permission to use, copy, modify, and distribute this 11 * software is freely granted, provided that this notice 12 * is preserved. 13 * ==================================================== 14 */ 15 16 #if defined(LIBM_SCCS) && !defined(lint) 17 static char rcsid[] = "NetBSD: "; 18 #endif 19 20 /* 21 * ceilq(x) 22 * Return x rounded toward -inf to integral value 23 * Method: 24 * Bit twiddling. 25 */ 26 27 #define NO_MATH_REDIRECT 28 29 #include "quadmath-imp.h" 30 31 __float128 ceilq(__float128 x) 32 { 33 int64_t i0,i1,j0; 34 uint64_t i,j; 35 GET_FLT128_WORDS64(i0,i1,x); 36 j0 = ((i0>>48)&0x7fff)-0x3fff; 37 if(j0<48) { 38 if(j0<0) { 39 /* return 0*sign(x) if |x|<1 */ 40 if(i0<0) {i0=0x8000000000000000ULL;i1=0;} 41 else if((i0|i1)!=0) { i0=0x3fff000000000000ULL;i1=0;} 42 } else { 43 i = (0x0000ffffffffffffULL)>>j0; 44 if(((i0&i)|i1)==0) return x; /* x is integral */ 45 if(i0>0) i0 += (0x0001000000000000LL)>>j0; 46 i0 &= (~i); i1=0; 47 } 48 } else if (j0>111) { 49 if(j0==0x4000) return x+x; /* inf or NaN */ 50 else return x; /* x is integral */ 51 } else { 52 i = -1ULL>>(j0-48); 53 if((i1&i)==0) return x; /* x is integral */ 54 if(i0>0) { 55 if(j0==48) i0+=1; 56 else { 57 j = i1+(1LL<<(112-j0)); 58 if(j<i1) i0 +=1 ; /* got a carry */ 59 i1=j; 60 } 61 } 62 i1 &= (~i); 63 } 64 SET_FLT128_WORDS64(x,i0,i1); 65 return x; 66 } 67