| /* floorq.c -- __float128 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. |
| * ==================================================== |
| */ |
| |
| #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; |
| } |
