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0ecb606c | 1 | /* Copyright (C) 1998, 1999, 2000, 2006 Free Software Foundation, Inc. |
7d84a067 RH |
2 | This file is part of the GNU C Library. |
3 | Contributed by Richard Henderson. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
41bdb6e2 AJ |
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. | |
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9 | |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
7d84a067 | 14 | |
41bdb6e2 AJ |
15 | You should have received a copy of the GNU Lesser General Public |
16 | License along with the GNU C Library; if not, write to the Free | |
17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
18 | 02111-1307 USA. */ | |
7d84a067 | 19 | |
7d84a067 | 20 | #include <math.h> |
0ecb606c | 21 | #include <math_ldbl_opt.h> |
7d84a067 | 22 | |
6eaccb75 UD |
23 | |
24 | /* Use the -inf rounding mode conversion instructions to implement | |
25 | floor. We note when the exponent is large enough that the value | |
26 | must be integral, as this avoids unpleasant integer overflows. */ | |
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27 | |
28 | double | |
29 | __floor (double x) | |
30 | { | |
b7434f82 | 31 | if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ |
d51913e9 | 32 | { |
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33 | double tmp1, new_x; |
34 | ||
d51913e9 UD |
35 | __asm ( |
36 | #ifdef _IEEE_FP_INEXACT | |
37 | "cvttq/svim %2,%1\n\t" | |
38 | #else | |
39 | "cvttq/svm %2,%1\n\t" | |
40 | #endif | |
41 | "cvtqt/m %1,%0\n\t" | |
b7434f82 | 42 | : "=f"(new_x), "=&f"(tmp1) |
d51913e9 | 43 | : "f"(x)); |
b7434f82 RH |
44 | |
45 | /* floor(-0) == -0, and in general we'll always have the same | |
46 | sign as our input. */ | |
47 | x = copysign(new_x, x); | |
d51913e9 UD |
48 | } |
49 | return x; | |
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50 | } |
51 | ||
52 | weak_alias (__floor, floor) | |
53 | #ifdef NO_LONG_DOUBLE | |
54 | strong_alias (__floor, __floorl) | |
55 | weak_alias (__floor, floorl) | |
56 | #endif | |
0ecb606c JJ |
57 | #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0) |
58 | compat_symbol (libm, __floor, floorl, GLIBC_2_0); | |
59 | #endif |