1 /* s_floorl.c -- long double version of s_floor.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 * floorq(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 floorq(__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=i1=0;} 41 else if(((i0&0x7fffffffffffffffLL)|i1)!=0) 42 { i0=0xbfff000000000000ULL;i1=0;} 43 } else { 44 i = (0x0000ffffffffffffULL)>>j0; 45 if(((i0&i)|i1)==0) return x; /* x is integral */ 46 if(i0<0) i0 += (0x0001000000000000LL)>>j0; 47 i0 &= (~i); i1=0; 48 } 49 } else if (j0>111) { 50 if(j0==0x4000) return x+x; /* inf or NaN */ 51 else return x; /* x is integral */ 52 } else { 53 i = -1ULL>>(j0-48); 54 if((i1&i)==0) return x; /* x is integral */ 55 if(i0<0) { 56 if(j0==48) i0+=1; 57 else { 58 j = i1+(1LL<<(112-j0)); 59 if(j<i1) i0 +=1 ; /* got a carry */ 60 i1=j; 61 } 62 } 63 i1 &= (~i); 64 } 65 SET_FLT128_WORDS64(x,i0,i1); 66 return x; 67 } 68