mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-28 13:31:13 +00:00
69 lines
1.8 KiB
C
69 lines
1.8 KiB
C
/* Truncate (toward zero) long double floating-point values.
|
|
IBM extended format long double version.
|
|
Copyright (C) 2006-2020 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
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
|
|
<https://www.gnu.org/licenses/>. */
|
|
|
|
#define NO_MATH_REDIRECT
|
|
#include <math.h>
|
|
#include <math_private.h>
|
|
#include <math_ldbl_opt.h>
|
|
#include <float.h>
|
|
#include <ieee754.h>
|
|
|
|
double ceil (double) asm ("__ceil");
|
|
double floor (double) asm ("__floor");
|
|
double trunc (double) asm ("__trunc");
|
|
|
|
|
|
long double
|
|
__truncl (long double x)
|
|
{
|
|
double xh, xl, hi, lo;
|
|
|
|
ldbl_unpack (x, &xh, &xl);
|
|
|
|
/* Return Inf, Nan, +/-0 unchanged. */
|
|
if (__builtin_expect (xh != 0.0
|
|
&& __builtin_isless (__builtin_fabs (xh),
|
|
__builtin_inf ()), 1))
|
|
{
|
|
hi = trunc (xh);
|
|
if (hi != xh)
|
|
{
|
|
/* The high part is not an integer; the low part does not
|
|
affect the result. */
|
|
xh = hi;
|
|
xl = 0;
|
|
}
|
|
else
|
|
{
|
|
/* The high part is a nonzero integer. */
|
|
lo = xh > 0 ? floor (xl) : ceil (xl);
|
|
xh = hi;
|
|
xl = lo;
|
|
ldbl_canonicalize_int (&xh, &xl);
|
|
}
|
|
}
|
|
else
|
|
/* Quiet signaling NaN arguments. */
|
|
xh += xh;
|
|
|
|
return ldbl_pack (xh, xl);
|
|
}
|
|
|
|
long_double_symbol (libm, __truncl, truncl);
|