| /* s_floorl.c -- long double version of s_floor.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 | |
| /* | |
| * floorq(x) | |
| * Return x rounded toward -inf to integral value | |
| * Method: | |
| * Bit twiddling. | |
| */ | |
| #define NO_MATH_REDIRECT | |
| #include "quadmath-imp.h" | |
| __float128 floorq(__float128 x) | |
| { | |
| int64_t i0,i1,j0; | |
| uint64_t i,j; | |
| GET_FLT128_WORDS64(i0,i1,x); | |
| j0 = ((i0>>48)&0x7fff)-0x3fff; | |
| if(j0<48) { | |
| if(j0<0) { | |
| /* return 0*sign(x) if |x|<1 */ | |
| if(i0>=0) {i0=i1=0;} | |
| else if(((i0&0x7fffffffffffffffLL)|i1)!=0) | |
| { i0=0xbfff000000000000ULL;i1=0;} | |
| } else { | |
| i = (0x0000ffffffffffffULL)>>j0; | |
| if(((i0&i)|i1)==0) return x; /* x is integral */ | |
| 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(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_FLT128_WORDS64(x,i0,i1); | |
| return x; | |
| } |