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a334319f | 1 | /* Copyright (C) 1998, 2000 Free Software Foundation, Inc. |
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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 | |
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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 | |
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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. */ | |
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19 | |
20 | #include <math.h> | |
21 | ||
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22 | /* Use the -inf rounding mode conversion instructions to implement |
23 | ceil, via something akin to -floor(-x). This is much faster than | |
24 | playing with the fpcr to achieve +inf rounding mode. */ | |
25 | ||
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26 | double |
27 | __ceil (double x) | |
28 | { | |
b7434f82 | 29 | if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ |
7d84a067 | 30 | { |
b7434f82 | 31 | double tmp1, new_x; |
7d84a067 | 32 | |
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33 | new_x = -x; |
34 | __asm ( | |
7d84a067 | 35 | #ifdef _IEEE_FP_INEXACT |
b7434f82 | 36 | "cvttq/svim %2,%1\n\t" |
7d84a067 | 37 | #else |
b7434f82 | 38 | "cvttq/svm %2,%1\n\t" |
7d84a067 | 39 | #endif |
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40 | "cvtqt/m %1,%0\n\t" |
41 | : "=f"(new_x), "=&f"(tmp1) | |
42 | : "f"(new_x)); | |
7d84a067 | 43 | |
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44 | /* Fix up the negation we did above, as well as handling -0 properly. */ |
45 | x = copysign(new_x, x); | |
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46 | } |
47 | return x; | |
48 | } | |
49 | ||
50 | weak_alias (__ceil, ceil) | |
51 | #ifdef NO_LONG_DOUBLE | |
52 | strong_alias (__ceil, __ceill) | |
53 | weak_alias (__ceil, ceill) | |
54 | #endif |