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author | Roland McGrath <roland@gnu.org> | 1996-05-30 16:12:42 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 1996-05-30 16:12:42 +0000 |
commit | 76060ec0b8b5d6f0a860a94f100dc6e48041bac3 (patch) | |
tree | b4ff1b5370a30a16705239598cb8e98f4b80b9ca /sysdeps/libm-ieee754/s_rintl.c | |
parent | c3352e623384fe221743a6d2212c17d9619041ef (diff) | |
download | glibc-76060ec0b8b5d6f0a860a94f100dc6e48041bac3.tar.gz glibc-76060ec0b8b5d6f0a860a94f100dc6e48041bac3.tar.xz glibc-76060ec0b8b5d6f0a860a94f100dc6e48041bac3.zip |
Thu May 30 11:24:05 1996 Roland McGrath <roland@delasyd.gnu.ai.mit.edu> cvs/libc-960602 cvs/libc-960601 cvs/libc-960531
* po/header.pot: Replace with exact boilerplate pinard dictates. * sysdeps/i386/strtok.S (Lillegal_argument): Remove this code to set errno and the check that jumped to it. * sysdeps/mach/hurd/Makefile (errnos.d): Use $(sed-remove-objpfx). Thu May 30 03:21:57 1996 Ulrich Drepper <drepper@cygnus.com> * FAQ: Document need of gperf program for developers. * elf/elf.h: Fix typos in comments. * libio/stdio.h [!__STRICT_ANSI__ || _POSIX_SOURCE]: Add prototypes for `ctermid' and `cuserid'. * locale/programs/locale.c: Switch to user selected locale before printing variables. * math/Makefile [$(long-double-fcts)==yes]: Define long-m-routines and long-c-routines. Only if the `long double' data type is available we need to compile the functions. (libm-routines): Add $(long-m-routines). (routines): Remove isinfl, isnanl. Use new file s_isinfl and s_isnanl instead if `long double' is available. * math/math.h: Include <mathcalls.h> again to define `long double' functions. * math/math_private.h: Define data types, prototypes and access macros for `long double'. * stdlib/stdlib.h: Add prototypes for `strtoll' and `strtoull'. [GCC2 && OPTIMIZE]: Define strto{,u}ll as inline function which calls __strto{,u}q_internal. * stdlib/strfmon.c: Replace PTR by `void *'. * stdlib/strtoq.c: Define strtoll as weak alias. * stdlib/strtouq.c: Define strtoull as weak alias. * string/tester.c: Correct `strsep' test. * sysdeps/generic/strsep.c: Make compatible with BSD version. Trailing characters of skip set are not skipped. In this case empty tokens are returned. * sysdeps/i386/isinfl.c, sysdeps/i386/isnanl.c, sysdeps/ieee754/isinf.c, sysdeps/ieee754/isinfl.c, sysdeps/ieee754/isnan.c, sysdeps/ieee754/isnanl.c: Removed. We now use the versions part of libm. * sysdeps/i386/strsep.S: Removed. Generic C version is of similar speed. * sysdeps/i386/strtok.S: Remove support for `strsep'. * sysdeps/libm-i387/e_acosl.S, sysdeps/libm-i387/s_ceill.S, sysdeps/libm-i387/s_copysignl.S, sysdeps/libm-i387/s_finitel.S, sysdeps/libm-i387/s_floorl.S, sysdeps/libm-i387/s_isinfl.c, sysdeps/libm-i387/s_isnanl.c, sysdeps/libm-i387/s_nextafterl.c, sysdeps/libm-i387/s_rintl.S, sysdeps/libm-i387/s_significandl.S: New i387 specific math functions implementing `long double' versions. * sysdeps/libm-ieee754/s_ceill.c, sysdeps/libm-ieee754/s_copysignl.c, sysdeps/libm-ieee754/s_fabsl.c, sysdeps/libm-ieee754/s_finitel.c, sysdeps/libm-ieee754/s_floorl.c, sysdeps/libm-ieee754/s_isinfl.c, sysdeps/libm-ieee754/s_isnanl.c, sysdeps/libm-ieee754/s_nextafterl.c, sysdeps/libm-ieee754/s_rintl.c, sysdeps/libm-ieee754/s_scalbnl.c, sysdeps/libm-ieee754/s_significandl.c: New generic `long double' versions of libm functions. * sysdeps/libm-i387/e_exp.S: Add a few comments to explain the Intel FPU nonsense. * sysdeps/libm-i387/s_ceil.S, sysdeps/libm-i387/s_ceilf.S, sysdeps/libm-i387/s_floor.S, sysdeps/libm-i387/s_floorf.S: Correct handling of local variables. The old version created a stack frame but stored the values outside. * sysdeps/libm-ieee754/s_isinf.c, sysdeps/libm-ieee754/s_isnan.c [!NO_LONG_DOUBLE]: Define alias with `long double' versions name. * login/pututline_r.c: Include sys/stat.h. Fix typos. according to currently used locale for category LC_CTYPE by inet_nsap_ntoa. Now in <arpa/inet.h>. _IO_dup2 to contain complete parameter list.
Diffstat (limited to 'sysdeps/libm-ieee754/s_rintl.c')
-rw-r--r-- | sysdeps/libm-ieee754/s_rintl.c | 96 |
1 files changed, 96 insertions, 0 deletions
diff --git a/sysdeps/libm-ieee754/s_rintl.c b/sysdeps/libm-ieee754/s_rintl.c new file mode 100644 index 0000000000..c9f12b162a --- /dev/null +++ b/sysdeps/libm-ieee754/s_rintl.c @@ -0,0 +1,96 @@ +/* s_rintl.c -- long double version of s_rint.c. + * Conversion to long double 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 + +/* + * rintl(x) + * Return x rounded to integral value according to the prevailing + * rounding mode. + * Method: + * Using floating addition. + * Exception: + * Inexact flag raised if x not equal to rintl(x). + */ + +#include "math.h" +#include "math_private.h" + +#ifdef __STDC__ +static const long double +#else +static long double +#endif +TWO64[2]={ + 1.844674407370955161600000e+19, /* 0x403F, 0x00000000, 0x00000000 */ + -1.844674407370955161600000e+19, /* 0xC03F, 0x00000000, 0x00000000 */ +}; + +#ifdef __STDC__ + long double __rintl(long double x) +#else + long double __rintl(x) + long double x; +#endif +{ + int32_t se,j0,sx; + u_int32_t i,i0,i1; + long double w,t; + GET_LDOUBLE_WORDS(se,i0,i1,x); + sx = (se>>15)&1; + j0 = (se&0x7fff)-0x3fff; + if(j0<32) { + if(j0<0) { + if(((se&0x7fff)|i0|i1)==0) return x; + i1 |= i0; + i0 &= 0xe0000000; + i0 |= (i1|-i1)&0x80000000; + SET_LDOUBLE_MSW(x,i0); + w = TWO64[sx]+x; + t = w-TWO64[sx]; + GET_LDOUBLE_EXP(i0,t); + SET_LDOUBLE_EXP(t,(i0&0x7fff)|(sx<<15)); + return t; + } else { + i = (0xffffffff)>>j0; + if(((i0&i)|i1)==0) return x; /* x is integral */ + i>>=1; + if(((i0&i)|i1)!=0) { + if(j0==31) i1 = 0x40000000; else + i0 = (i0&(~i))|((0x20000000)>>j0); + /* Shouldn't this be + if (j0 >= 30) i1 = 0x80000000 >> (j0 - 30); + i0 = (i0&(~i))|((0x20000000)>>j0); + If yes, this should be correct in s_rint and + s_rintf, too. -- drepper@cygnus.com */ + } + } + } else if (j0>63) { + if(j0==0x4000) return x+x; /* inf or NaN */ + else return x; /* x is integral */ + } else { + i = ((u_int32_t)(0xffffffff))>>(j0-32); + if((i1&i)==0) return x; /* x is integral */ + i>>=1; + if((i1&i)!=0) i1 = (i1&(~i))|((0x40000000)>>(j0-32)); + } + SET_LDOUBLE_WORDS(x,se,i0,i1); + w = TWO64[sx]+x; + return w-TWO64[sx]; +} +weak_alias (__rintl, rintl) |