projects / thirdparty / glibc.git / blame
| Commit | Line | Data |
|---|---|---|
| 76060ec0 RM |
1 | /* s_nextafterl.c -- long double version of s_nextafter.c. |
| 2 | * Conversion to long double by Ulrich Drepper, | |
| 3 | * Cygnus Support, drepper@cygnus.com. | |
| 4 | */ | |
| 5 | ||
| 6 | /* | |
| 7 | * ==================================================== | |
| 8 | * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved. | |
| 9 | * | |
| 10 | * Developed at SunPro, a Sun Microsystems, Inc. business. | |
| 11 | * Permission to use, copy, modify, and distribute this | |
| 12 | * software is freely granted, provided that this notice | |
| 13 | * is preserved. | |
| 14 | * ==================================================== | |
| 15 | */ | |
| 16 | ||
| 17 | #if defined(LIBM_SCCS) && !defined(lint) | |
| 18 | static char rcsid[] = "$NetBSD: $"; | |
| 19 | #endif | |
| 20 | ||
| 21 | /* IEEE functions | |
| 22 | * nextafterl(x,y) | |
| 23 | * return the next machine floating-point number of x in the | |
| 24 | * direction toward y. | |
| 25 | * Special cases: | |
| 26 | */ | |
| 27 | ||
| 28 | #include "math.h" | |
| 32c075e1 | 29 | #include <math_private.h> |
| 76060ec0 RM |
30 | |
| 31 | #ifdef __STDC__ | |
| 32 | long double __nextafterl(long double x, long double y) | |
| 33 | #else | |
| 34 | long double __nextafterl(x,y) | |
| 35 | long double x,y; | |
| 36 | #endif | |
| 37 | { | |
| 38 | int32_t hx,hy,ix,iy; | |
| 39 | u_int32_t lx,ly,esx,esy; | |
| 40 | ||
| 41 | GET_LDOUBLE_WORDS(esx,hx,lx,x); | |
| 42 | GET_LDOUBLE_WORDS(esy,hy,ly,y); | |
| 43 | ix = esx&0x7fff; /* |x| */ | |
| 44 | iy = esy&0x7fff; /* |y| */ | |
| 45 | ||
| c831ae54 AJ |
46 | if (((ix==0x7fff)&&((hx|lx)!=0)) || /* x is nan */ |
| 47 | ((iy==0x7fff)&&((hy|ly)!=0))) /* y is nan */ | |
| 76060ec0 | 48 | return x+y; |
| bc9f6000 | 49 | if(x==y) return y; /* x=y, return y */ |
| 76060ec0 | 50 | if((ix|hx|lx)==0) { /* x == 0 */ |
| 32c075e1 | 51 | long double u; |
| 636ccfc8 | 52 | SET_LDOUBLE_WORDS(x,esy&0x8000,0,1);/* return +-minsubnormal */ |
| 32c075e1 JJ |
53 | u = math_opt_barrier (x); |
| 54 | u = u * u; | |
| 55 | math_force_eval (u); /* raise underflow flag */ | |
| 56 | return x; | |
| 76060ec0 RM |
57 | } |
| 58 | if(esx<0x8000) { /* x > 0 */ | |
| 59 | if(ix>iy||((ix==iy) && (hx>hy||((hx==hy)&&(lx>ly))))) { | |
| 60 | /* x > y, x -= ulp */ | |
| 61 | if(lx==0) { | |
| 62 | if (hx==0) esx -= 1; | |
| 63 | hx -= 1; | |
| 64 | } | |
| 65 | lx -= 1; | |
| 66 | } else { /* x < y, x += ulp */ | |
| 67 | lx += 1; | |
| 68 | if(lx==0) { | |
| 69 | hx += 1; | |
| 70 | if (hx==0) | |
| 71 | esx += 1; | |
| 72 | } | |
| 73 | } | |
| 74 | } else { /* x < 0 */ | |
| 75 | if(esy>=0||(ix>iy||((ix==iy)&&(hx>hy||((hx==hy)&&(lx>ly)))))){ | |
| 76 | /* x < y, x -= ulp */ | |
| 77 | if(lx==0) { | |
| 78 | if (hx==0) esx -= 1; | |
| 79 | hx -= 1; | |
| 80 | } | |
| 81 | lx -= 1; | |
| 82 | } else { /* x > y, x += ulp */ | |
| 83 | lx += 1; | |
| 84 | if(lx==0) { | |
| 85 | hx += 1; | |
| 86 | if (hx==0) esx += 1; | |
| 87 | } | |
| 88 | } | |
| 89 | } | |
| 90 | esy = esx&0x7fff; | |
| 32c075e1 JJ |
91 | if(esy==0x7fff) return x+x; /* overflow */ |
| 92 | if(esy==0) { | |
| 93 | long double u = x*x; /* underflow */ | |
| 94 | math_force_eval (u); /* raise underflow flag */ | |
| 76060ec0 RM |
95 | } |
| 96 | SET_LDOUBLE_WORDS(x,esx,hx,lx); | |
| 97 | return x; | |
| 98 | } | |
| 99 | weak_alias (__nextafterl, nextafterl) | |
| 36fe9ac9 UD |
100 | strong_alias (__nextafterl, __nexttowardl) |
| 101 | weak_alias (__nextafterl, nexttowardl) |