b75bc69cdf
The implementation of lround in dbl-64/wordsize-64 as an alias or wrapper for llround is always incorrect when long is not 64-bit, because it misses required exceptions in overflow cases, as shown by my recently added tests. This patch removes that alias / wrapper in the non-LP64 case, together with the REGISTER_CAST_INT32_TO_INT64 macro, restoring the previous version of lround for dbl-64/wordsize-64 (newly conditioned on !_LP64). Tested for x86_64, and for mips64 with use of dbl-64/wordsize-64 enabled. [BZ #19079] * sysdeps/ieee754/dbl-64/wordsize-64/s_lround.c: Restore previous file, conditioned on [!_LP64]. * sysdeps/ieee754/dbl-64/wordsize-64/s_llround.c [!_LP64] (__lround): Do not define as function or alias. [!_LP64] (lround): Likewise. [!_LP64] (__lroundl): Likewise. [!_LP64] (lroundl): Likewise. * sysdeps/tile/sysdep.h (REGISTER_CAST_INT32_TO_INT64): Remove macro. * sysdeps/x86_64/x32/sysdep.h (REGISTER_CAST_INT32_TO_INT64): Likewise.
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/* Round double value to long long int.
|
|
Copyright (C) 1997-2015 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#define lround __hidden_lround
|
|
#define __lround __hidden___lround
|
|
|
|
#include <math.h>
|
|
#include <sysdep.h>
|
|
|
|
#include <math_private.h>
|
|
|
|
|
|
long long int
|
|
__llround (double x)
|
|
{
|
|
int32_t j0;
|
|
int64_t i0;
|
|
long long int result;
|
|
int sign;
|
|
|
|
EXTRACT_WORDS64 (i0, x);
|
|
j0 = ((i0 >> 52) & 0x7ff) - 0x3ff;
|
|
sign = i0 < 0 ? -1 : 1;
|
|
i0 &= UINT64_C(0xfffffffffffff);
|
|
i0 |= UINT64_C(0x10000000000000);
|
|
|
|
if (j0 < (int32_t) (8 * sizeof (long long int)) - 1)
|
|
{
|
|
if (j0 < 0)
|
|
return j0 < -1 ? 0 : sign;
|
|
else if (j0 >= 52)
|
|
result = i0 << (j0 - 52);
|
|
else
|
|
{
|
|
i0 += UINT64_C(0x8000000000000) >> j0;
|
|
|
|
result = i0 >> (52 - j0);
|
|
}
|
|
}
|
|
else
|
|
{
|
|
/* The number is too large. It is left implementation defined
|
|
what happens. */
|
|
return (long long int) x;
|
|
}
|
|
|
|
return sign * result;
|
|
}
|
|
|
|
weak_alias (__llround, llround)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__llround, __llroundl)
|
|
weak_alias (__llround, llroundl)
|
|
#endif
|
|
|
|
/* long has the same width as long long on LP64 machines, so use an alias. */
|
|
#undef lround
|
|
#undef __lround
|
|
#ifdef _LP64
|
|
strong_alias (__llround, __lround)
|
|
weak_alias (__llround, lround)
|
|
# ifdef NO_LONG_DOUBLE
|
|
strong_alias (__llround, __lroundl)
|
|
weak_alias (__llround, lroundl)
|
|
# endif
|
|
#endif
|