| 1 | /* Raise given exceptions. |
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| 2 | Copyright (C) 1997-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 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 |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <fenv.h> |
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| 20 | #include <float.h> |
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| 21 | #include <math.h> |
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| 22 | #include <shlib-compat.h> |
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| 23 | #include <math-barriers.h> |
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| 24 | |
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| 25 | int |
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| 26 | __feraiseexcept (int excepts) |
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| 27 | { |
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| 28 | static const struct { |
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| 29 | double zero, one, max, min, pi; |
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| 30 | } c = { |
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| 31 | 0.0, 1.0, DBL_MAX, DBL_MIN, M_PI |
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| 32 | }; |
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| 33 | double d; |
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| 34 | |
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| 35 | /* Raise exceptions represented by EXPECTS. But we must raise only |
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| 36 | one signal at a time. It is important the if the overflow/underflow |
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| 37 | exception and the inexact exception are given at the same time, |
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| 38 | the overflow/underflow exception follows the inexact exception. */ |
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| 39 | |
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| 40 | /* First: invalid exception. */ |
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| 41 | if ((FE_INVALID & excepts) != 0) |
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| 42 | { |
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| 43 | /* One example of an invalid operation is 0/0. */ |
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| 44 | __asm ("" : "=e" (d) : "0" (c.zero)); |
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| 45 | d /= c.zero; |
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| 46 | math_force_eval (d); |
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| 47 | } |
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| 48 | |
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| 49 | /* Next: division by zero. */ |
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| 50 | if ((FE_DIVBYZERO & excepts) != 0) |
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| 51 | { |
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| 52 | __asm ("" : "=e" (d) : "0" (c.one)); |
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| 53 | d /= c.zero; |
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| 54 | math_force_eval (d); |
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| 55 | } |
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| 56 | |
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| 57 | /* Next: overflow. */ |
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| 58 | if ((FE_OVERFLOW & excepts) != 0) |
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| 59 | { |
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| 60 | __asm ("" : "=e" (d) : "0" (c.max)); |
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| 61 | d *= d; |
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| 62 | math_force_eval (d); |
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| 63 | } |
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| 64 | |
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| 65 | /* Next: underflow. */ |
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| 66 | if ((FE_UNDERFLOW & excepts) != 0) |
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| 67 | { |
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| 68 | __asm ("" : "=e" (d) : "0" (c.min)); |
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| 69 | d *= d; |
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| 70 | math_force_eval (d); |
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| 71 | } |
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| 72 | |
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| 73 | /* Last: inexact. */ |
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| 74 | if ((FE_INEXACT & excepts) != 0) |
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| 75 | { |
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| 76 | __asm ("" : "=e" (d) : "0" (c.one)); |
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| 77 | d /= c.pi; |
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| 78 | math_force_eval (d); |
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| 79 | } |
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| 80 | |
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| 81 | /* Success. */ |
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| 82 | return 0; |
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| 83 | } |
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| 84 | |
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| 85 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 86 | strong_alias (__feraiseexcept, __old_feraiseexcept) |
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| 87 | compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1); |
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| 88 | #endif |
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| 89 | |
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| 90 | libm_hidden_def (__feraiseexcept) |
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| 91 | libm_hidden_ver (__feraiseexcept, feraiseexcept) |
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| 92 | versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2); |
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| 93 | |
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