1 /* Copyright (C) 1998, 1999, 2000, 2006, 2007 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Richard Henderson.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library. If not, see
17 <http://www.gnu.org/licenses/>. */
20 #include <math_ldbl_opt.h>
23 /* Use the -inf rounding mode conversion instructions to implement
24 floor. We note when the exponent is large enough that the value
25 must be integral, as this avoids unpleasant integer overflows. */
30 if (isless (fabs (x
), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */
35 #ifdef _IEEE_FP_INEXACT
36 "cvttq/svim %2,%1\n\t"
41 : "=f"(new_x
), "=&f"(tmp1
)
44 /* floor(-0) == -0, and in general we'll always have the same
46 x
= copysign(new_x
, x
);
51 weak_alias (__floor
, floor
)
53 strong_alias (__floor
, __floorl
)
54 weak_alias (__floor
, floorl
)
56 #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0)
57 compat_symbol (libm
, __floor
, floorl
, GLIBC_2_0
);