diff options
Diffstat (limited to 'sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c')
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c | 119 |
1 files changed, 119 insertions, 0 deletions
diff --git a/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c new file mode 100644 index 0000000..39d0e6a --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c @@ -0,0 +1,119 @@ +/* s_nextafterl.c -- long double version of s_nextafter.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 + +/* IEEE functions + * nextafterl(x,y) + * return the next machine floating-point number of x in the + * direction toward y. + * Special cases: + */ + +#include <math.h> +#include <math_private.h> +#include <math_ldbl_opt.h> + +#ifdef __STDC__ + long double __nextafterl(long double x, long double y) +#else + long double __nextafterl(x,y) + long double x,y; +#endif +{ + int64_t hx,hy,ihx,ihy,ilx; + u_int64_t lx,ly; + + GET_LDOUBLE_WORDS64(hx,lx,x); + GET_LDOUBLE_WORDS64(hy,ly,y); + ihx = hx&0x7fffffffffffffffLL; /* |hx| */ + ilx = lx&0x7fffffffffffffffLL; /* |lx| */ + ihy = hy&0x7fffffffffffffffLL; /* |hy| */ + + if((((ihx&0x7ff0000000000000LL)==0x7ff0000000000000LL)&& + ((ihx&0x000fffffffffffffLL)!=0)) || /* x is nan */ + (((ihy&0x7ff0000000000000LL)==0x7ff0000000000000LL)&& + ((ihy&0x000fffffffffffffLL)!=0))) /* y is nan */ + return x+y; /* signal the nan */ + if(x==y) + return y; /* x=y, return y */ + if(ihx == 0 && ilx == 0) { /* x == 0 */ + long double u; + hy = (hy & 0x8000000000000000ULL) | 1; + SET_LDOUBLE_WORDS64(x,hy,0ULL);/* return +-minsubnormal */ + u = math_opt_barrier (x); + u = u * u; + math_force_eval (u); /* raise underflow flag */ + return x; + } + + long double u; + if(x > y) { /* x > y, x -= ulp */ + if((hx==0xffefffffffffffffLL)&&(lx==0xfc8ffffffffffffeLL)) + return x+x; /* overflow, return -inf */ + if (hx >= 0x7ff0000000000000LL) { + SET_LDOUBLE_WORDS64(u,0x7fefffffffffffffLL,0x7c8ffffffffffffeLL); + return u; + } + if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */ + u = math_opt_barrier (x); + x -= __LDBL_DENORM_MIN__; + if (ihx < 0x0360000000000000LL + || (hx > 0 && (int64_t) lx <= 0) + || (hx < 0 && (int64_t) lx > 1)) { + u = u * u; + math_force_eval (u); /* raise underflow flag */ + } + return x; + } + if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */ + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL); + u *= 0x1.0000000000000p-105L; + } else + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL); + return x - u; + } else { /* x < y, x += ulp */ + if((hx==0x7fefffffffffffffLL)&&(lx==0x7c8ffffffffffffeLL)) + return x+x; /* overflow, return +inf */ + if ((u_int64_t) hx >= 0xfff0000000000000ULL) { + SET_LDOUBLE_WORDS64(u,0xffefffffffffffffLL,0xfc8ffffffffffffeLL); + return u; + } + if(ihx <= 0x0360000000000000LL) { /* x <= LDBL_MIN */ + u = math_opt_barrier (x); + x += __LDBL_DENORM_MIN__; + if (ihx < 0x0360000000000000LL + || (hx > 0 && (int64_t) lx < 0 && lx != 0x8000000000000001LL) + || (hx < 0 && (int64_t) lx >= 0)) { + u = u * u; + math_force_eval (u); /* raise underflow flag */ + } + if (x == 0.0L) /* handle negative __LDBL_DENORM_MIN__ case */ + x = -0.0L; + return x; + } + if (ihx < 0x06a0000000000000LL) { /* ulp will denormal */ + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL),0ULL); + u *= 0x1.0000000000000p-105L; + } else + SET_LDOUBLE_WORDS64(u,(hx&0x7ff0000000000000LL)-0x0690000000000000LL,0ULL); + return x + u; + } +} +strong_alias (__nextafterl, __nexttowardl) +long_double_symbol (libm, __nextafterl, nextafterl); +long_double_symbol (libm, __nexttowardl, nexttowardl); |