| 1 | /* `HUGE_VALL' constant for ix86 (where it is infinity). |
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| 2 | Used by <stdlib.h> and <math.h> functions for overflow. |
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| 3 | Copyright (C) 1992-2016 Free Software Foundation, Inc. |
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| 4 | This file is part of the GNU C Library. |
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| 5 | |
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| 6 | The GNU C Library is free software; you can redistribute it and/or |
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| 7 | modify it under the terms of the GNU Lesser General Public |
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| 8 | License as published by the Free Software Foundation; either |
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| 9 | version 2.1 of the License, or (at your option) any later version. |
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| 10 | |
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| 11 | The GNU C Library is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 14 | Lesser General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU Lesser General Public |
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| 17 | License along with the GNU C Library; if not, see |
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| 18 | <http://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | #ifndef _MATH_H |
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| 21 | # error "Never use <bits/huge_vall.h> directly; include <math.h> instead." |
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| 22 | #endif |
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| 23 | |
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| 24 | #if __GNUC_PREREQ(3,3) |
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| 25 | # define HUGE_VALL (__builtin_huge_vall()) |
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| 26 | #elif __GNUC_PREREQ(2,96) |
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| 27 | # define HUGE_VALL (__extension__ 0x1.0p32767L) |
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| 28 | #else |
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| 29 | |
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| 30 | # define __HUGE_VALL_bytes { 0, 0, 0, 0, 0, 0, 0, 0x80, 0xff, 0x7f, 0, 0 } |
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| 31 | |
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| 32 | # define __huge_vall_t union { unsigned char __c[12]; long double __ld; } |
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| 33 | # ifdef __GNUC__ |
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| 34 | # define HUGE_VALL (__extension__ \ |
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| 35 | ((__huge_vall_t) { __c: __HUGE_VALL_bytes }).__ld) |
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| 36 | # else /* Not GCC. */ |
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| 37 | static __huge_vall_t __huge_vall = { __HUGE_VALL_bytes }; |
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| 38 | # define HUGE_VALL (__huge_vall.__ld) |
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| 39 | # endif /* GCC. */ |
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| 40 | |
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| 41 | #endif /* GCC 2.95 */ |
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| 42 | |
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