mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-20 17:51:16 +00:00
dd33e89fb2
1997-04-17 16:55 Ulrich Drepper <drepper@cygnus.com> * misc/libgen.h: Change prototype for of basename to XPG variant. * stdlib/Makefile (routines): Add xpg_basename. * stdlib/basename.c: New file. * string/string.h: Don't declare basename function if basename macro is available. 1997-04-16 17:33 Miles Bader <miles@gnu.ai.mit.edu> * login/utmp_file.c (proc_utmp_eq): Only use ut_id field if valid. 1997-04-15 12:47 Andreas Schwab <schwab@issan.informatik.uni-dortmund.de> * sysdeps/m68k/fpu/fclrexcpt.c: New file. * sysdeps/m68k/fpu/fenvbits.h: New file. * sysdeps/m68k/fpu/fegetenv.c: New file. * sysdeps/m68k/fpu/fegetround.c: New file. * sysdeps/m68k/fpu/fesetenv.c: New file. * sysdeps/m68k/fpu/fesetround.c: New file. * sysdeps/m68k/fpu/feupdateenv.c: New file. * sysdeps/m68k/fpu/fgetexcptflg.c: New file. * sysdeps/m68k/fpu/fraiseexcpt.c: New file. * sysdeps/m68k/fpu/fsetexcptflg.c: New file. * sysdeps/m68k/fpu/ftestexcept.c: New file. * sysdeps/m68k/fpu/mathbits.h: New file. * sysdeps/m68k/fpu/s_remquo.c: New file. * sysdeps/m68k/fpu/s_remquol.c: New file. * sysdeps/m68k/fpu/s_remquof.c: New file. * sysdeps/libm-ieee754/s_roundl.c: Restore integer bit when mantissa overflows into exponent. Fix priority of >> vs +. * math/libm-test.c (basic_tests): Use the appropriate isnan and isinf function to test the value of the nan function. 1997-04-15 13:40 Ulrich Drepper <drepper@cygnus.com> * sysdeps/libm-i387/s_finite.S: Fix typo. * sysdeps/i386/fpu/__math.h: Add optimized versions of isgreater, isgreaterequal, isless, islessequal, islessgreater, and isunordered.
107 lines
2.3 KiB
C
107 lines
2.3 KiB
C
/* Round long double to integer away from zero.
|
|
Copyright (C) 1997 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Library General Public License as
|
|
published by the Free Software Foundation; either version 2 of the
|
|
License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Library General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Library General Public
|
|
License along with the GNU C Library; see the file COPYING.LIB. If not,
|
|
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
|
|
Boston, MA 02111-1307, USA. */
|
|
|
|
#include <math.h>
|
|
|
|
#include "math_private.h"
|
|
|
|
|
|
static const long double huge = 1.0e4930;
|
|
|
|
|
|
long double
|
|
__roundl (long double x)
|
|
{
|
|
int32_t j0;
|
|
u_int32_t se, i1, i0;
|
|
|
|
GET_LDOUBLE_WORDS (se, i0, i1, x);
|
|
j0 = (se & 0x7fff) - 0x3fff;
|
|
if (j0 < 31)
|
|
{
|
|
if (j0 < 0)
|
|
{
|
|
if (huge + x > 0.0)
|
|
{
|
|
se &= 0x8000;
|
|
i0 = i1 = 0;
|
|
if (j0 == -1)
|
|
{
|
|
se |= 0x3fff;
|
|
i0 = 0x80000000;
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
u_int32_t i = 0x7fffffff >> j0;
|
|
if (((i0 & i) | i1) == 0)
|
|
/* X is integral. */
|
|
return x;
|
|
if (huge + x > 0.0)
|
|
{
|
|
/* Raise inexact if x != 0. */
|
|
u_int32_t j = i0 + (0x40000000 >> j0);
|
|
if (j < i0)
|
|
se += 1;
|
|
i0 = (j & ~i) | 0x80000000;
|
|
i1 = 0;
|
|
}
|
|
}
|
|
}
|
|
else if (j0 > 62)
|
|
{
|
|
if (j0 == 0x4000)
|
|
/* Inf or NaN. */
|
|
return x + x;
|
|
else
|
|
return x;
|
|
}
|
|
else
|
|
{
|
|
u_int32_t i = 0xffffffff >> (j0 - 31);
|
|
if ((i1 & i) == 0)
|
|
/* X is integral. */
|
|
return x;
|
|
|
|
if (huge + x > 0.0)
|
|
{
|
|
/* Raise inexact if x != 0. */
|
|
u_int32_t j = i1 + (1 << (62 - j0));
|
|
if (j < i1)
|
|
{
|
|
u_int32_t k = i0 + 1;
|
|
if (k < i0)
|
|
{
|
|
se += 1;
|
|
k |= 0x80000000;
|
|
}
|
|
i0 = k;
|
|
}
|
|
i1 = j;
|
|
}
|
|
i1 &= ~i;
|
|
}
|
|
|
|
SET_LDOUBLE_WORDS (x, se, i0, i1);
|
|
return x;
|
|
}
|
|
weak_alias (__roundl, roundl)
|