mirror of
https://sourceware.org/git/glibc.git
synced 2024-12-25 20:21:07 +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.
53 lines
1.5 KiB
C
53 lines
1.5 KiB
C
/* Copyright (C) 2007-2014 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 chopped rounding mode conversion instructions to implement trunc. */
|
|
|
|
double
|
|
__trunc (double x)
|
|
{
|
|
double two52 = copysign (0x1.0p52, x);
|
|
double r, tmp;
|
|
|
|
__asm (
|
|
#ifdef _IEEE_FP_INEXACT
|
|
"addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0"
|
|
#else
|
|
"addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0"
|
|
#endif
|
|
: "=&f"(r), "=&f"(tmp)
|
|
: "f"(x), "f"(two52));
|
|
|
|
/* trunc(-0) == -0, and in general we'll always have the same
|
|
sign as our input. */
|
|
return copysign (r, x);
|
|
}
|
|
|
|
weak_alias (__trunc, trunc)
|
|
#ifdef NO_LONG_DOUBLE
|
|
strong_alias (__trunc, __truncl)
|
|
weak_alias (__trunc, truncl)
|
|
#endif
|
|
#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_1)
|
|
compat_symbol (libm, __trunc, truncl, GLIBC_2_1);
|
|
#endif
|