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author | Ulrich Drepper <drepper@redhat.com> | 1999-01-19 10:11:00 +0000 |
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committer | Ulrich Drepper <drepper@redhat.com> | 1999-01-19 10:11:00 +0000 |
commit | 36fe9ac901177d677c7dced4b71e5fcd8c68a32d (patch) | |
tree | da8e39df0b8df30cdab9befe1ad66fec35c5ee60 /sysdeps/libm-ieee754/s_nexttoward.c | |
parent | 1ca8b61adeabc83e3ba81f0f6aaa43df70ca98d1 (diff) | |
download | glibc-36fe9ac901177d677c7dced4b71e5fcd8c68a32d.tar.gz glibc-36fe9ac901177d677c7dced4b71e5fcd8c68a32d.tar.xz glibc-36fe9ac901177d677c7dced4b71e5fcd8c68a32d.zip |
Update.
1999-01-19 Ulrich Drepper <drepper@cygnus.com> * math/Makefile (libm-calls): Rename s_nextafterx to s_nexttoward. * math/Versions: Likewise. * math/bits/mathcalls.h: Likewise. * manual/arith.texi: Likewise. * sysdeps/libm-ieee754/s_nextafterl.c: Likewise. * sysdeps/libm-ieee754/s_nextafterx.c: Replaced by... * sysdeps/libm-ieee754/s_nexttoward.c: New file. * sysdeps/libm-ieee754/s_nextafterxf.c: Replaced by... * sysdeps/libm-ieee754/s_nexttowardf.c: New file. * sysdeps/libm-ieee754/s_nextafterxl.c: Replaced by... * sysdeps/libm-ieee754/s_nexttowardl.c: New file. * time/Makefile (routines): Removed strfxtime. * time/Versions: Likewise. * time/strfxtime.c: Removed. * time/time.h: Remove _LOCALTIME, _NO_LEAP_SECONDS, struct tmx, mkxtime, and strfxtime.
Diffstat (limited to 'sysdeps/libm-ieee754/s_nexttoward.c')
-rw-r--r-- | sysdeps/libm-ieee754/s_nexttoward.c | 98 |
1 files changed, 98 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_nexttoward.c b/sysdeps/libm-ieee754/s_nexttoward.c new file mode 100644 index 0000000000..0bb57d8465 --- /dev/null +++ b/sysdeps/libm-ieee754/s_nexttoward.c @@ -0,0 +1,98 @@ +/* s_nexttoward.c + * Conversion from s_nextafter.c by Ulrich Drepper, Cygnus Support, + * drepper@cygnus.com. + */ + +/* + * ==================================================== + * 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 + * nextafterx(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" + +#ifdef __STDC__ + double __nexttoward(double x, long double y) +#else + double __nexttoward(x,y) + double x; + long double y; +#endif +{ + int32_t hx,ix,iy; + u_int32_t lx,hy,ly,esy; + + EXTRACT_WORDS(hx,lx,x); + GET_LDOUBLE_WORDS(esy,hy,ly,y); + ix = hx&0x7fffffff; /* |x| */ + iy = esy&0x7fff; /* |y| */ + + if(((ix>=0x7ff00000)&&((ix-0x7ff00000)|lx)!=0) || /* x is nan */ + ((iy>=0x7fff)&&((hy|ly)|-(hy|ly))!=0)) /* y is nan */ + return x+y; + if((long double) x==y) return x; /* x=y, return x */ + if((ix|lx)==0) { /* x == 0 */ + double x2; + INSERT_WORDS(x,esy&0x8000?0x80000000:0,1);/* return +-minsub */ + x2 = x*x; + if(x2==x) return x2; else return x; /* raise underflow flag */ + } + if(hx>=0) { /* x > 0 */ + if (esy>=0x8000||((ix>>20)&0x7ff)>iy + || (((ix>>20)&0x7ff)==iy + && (((hx<<11)|(lx>>21))>(hy&0x7fffffff) + || (((hx<<11)|(lx>>21))==(hy&0x7fffffff) + && (lx<<11)>ly)))) { /* x > y, x -= ulp */ + if(lx==0) hx -= 1; + lx -= 1; + } else { /* x < y, x += ulp */ + lx += 1; + if(lx==0) hx += 1; + } + } else { /* x < 0 */ + if (esy<0x8000||((ix>>20)&0x7ff)>iy + || (((ix>>20)&0x7ff)==iy + && (((hx<<11)|(lx>>21))>(hy&0x7fffffff) + || (((hx<<11)|(lx>>21))==(hy&0x7fffffff) + && (lx<<11)>ly)))) {/* x < y, x -= ulp */ + if(lx==0) hx -= 1; + lx -= 1; + } else { /* x > y, x += ulp */ + lx += 1; + if(lx==0) hx += 1; + } + } + hy = hx&0x7ff00000; + if(hy>=0x7ff00000) return x+x; /* overflow */ + if(hy<0x00100000) { /* underflow */ + double x2 = x*x; + if(x2!=x) { /* raise underflow flag */ + INSERT_WORDS(x2,hx,lx); + return x2; + } + } + INSERT_WORDS(x,hx,lx); + return x; +} +weak_alias (__nexttoward, nexttoward) +#ifdef NO_LONG_DOUBLE +strong_alias (__nexttoward, __nexttowardl) +weak_alias (__nexttoward, nexttowardl) +#endif |