mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
68b7efaadb
Also fixed the following whitespace nits to satisfy the push: sysdeps/alpha/alphaev6/memset.S:142: space before tab in indent. sysdeps/alpha/configure:1: new blank line at EOF. sysdeps/alpha/fpu/e_sqrt.c:126: space before tab in indent. sysdeps/alpha/preconfigure:1: new blank line at EOF. sysdeps/unix/sysv/linux/alpha/syscalls.list:1: new blank line at EOF.
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Copyright (C) 1998-2014 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
Contributed by Richard Henderson.
|
|
|
|
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/>. */
|
|
|
|
#include <math.h>
|
|
#include <math_ldbl_opt.h>
|
|
|
|
/* Use the -inf rounding mode conversion instructions to implement
|
|
ceil, via something akin to -floor(-x). This is much faster than
|
|
playing with the fpcr to achieve +inf rounding mode. */
|
|
|
|
double
|
|
__ceil (double x)
|
|
{
|
|
if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
|
|
{
|
|
double tmp1, new_x;
|
|
|
|
new_x = -x;
|
|
__asm (
|
|
#ifdef _IEEE_FP_INEXACT
|
|
"cvttq/svim %2,%1\n\t"
|
|
#else
|
|
"cvttq/svm %2,%1\n\t"
|
|
#endif
|
|
"cvtqt/m %1,%0\n\t"
|
|
: "=f"(new_x), "=&f"(tmp1)
|
|
: "f"(new_x));
|
|
|
|
/* Fix up the negation we did above, as well as handling -0 properly. */
|
|
x = copysign(new_x, x);
|
|
}
|
|
return x;
|
|
}
|
|
|
|
weak_alias (__ceil, ceil)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__ceil, __ceill)
|
|
weak_alias (__ceil, ceill)
|
|
#endif
|
|
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
|
|
compat_symbol (libm, __ceil, ceill, GLIBC_2_0);
|
|
#endif
|