| 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 | |
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| 23 | int |
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| 24 | __feraiseexcept (int excepts) |
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| 25 | { |
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| 26 | /* Raise exceptions represented by EXCEPTS. But we must raise only one |
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| 27 | signal at a time. It is important that if the overflow/underflow |
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| 28 | exception and the divide by zero exception are given at the same |
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| 29 | time, the overflow/underflow exception follows the divide by zero |
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| 30 | exception. */ |
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| 31 | |
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| 32 | /* First: invalid exception. */ |
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| 33 | if (excepts & FE_INVALID) |
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| 34 | { |
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| 35 | /* One example of an invalid operation is 0 * Infinity. */ |
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| 36 | double d = HUGE_VAL; |
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| 37 | __asm__ __volatile__ ("fmul%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); |
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| 38 | } |
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| 39 | |
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| 40 | /* Next: division by zero. */ |
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| 41 | if (excepts & FE_DIVBYZERO) |
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| 42 | { |
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| 43 | double d = 1.0; |
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| 44 | __asm__ __volatile__ ("fdiv%.s %#0r0,%0; fnop" : "=f" (d) : "0" (d)); |
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| 45 | } |
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| 46 | |
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| 47 | /* Next: overflow. */ |
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| 48 | if (excepts & FE_OVERFLOW) |
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| 49 | { |
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| 50 | long double d = LDBL_MAX; |
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| 51 | |
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| 52 | __asm__ __volatile__ ("fmul%.x %0,%0; fnop" : "=f" (d) : "0" (d)); |
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| 53 | } |
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| 54 | |
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| 55 | /* Next: underflow. */ |
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| 56 | if (excepts & FE_UNDERFLOW) |
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| 57 | { |
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| 58 | long double d = -LDBL_MAX; |
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| 59 | |
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| 60 | __asm__ __volatile__ ("fetox%.x %0; fnop" : "=f" (d) : "0" (d)); |
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| 61 | } |
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| 62 | |
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| 63 | /* Last: inexact. */ |
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| 64 | if (excepts & FE_INEXACT) |
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| 65 | { |
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| 66 | long double d = 1.0; |
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| 67 | __asm__ __volatile__ ("fdiv%.s %#0r3,%0; fnop" : "=f" (d) : "0" (d)); |
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| 68 | } |
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| 69 | |
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| 70 | /* Success. */ |
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| 71 | return 0; |
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| 72 | } |
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| 73 | |
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| 74 | #include <shlib-compat.h> |
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| 75 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 76 | strong_alias (__feraiseexcept, __old_feraiseexcept) |
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| 77 | compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1); |
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| 78 | #endif |
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| 79 | |
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| 80 | libm_hidden_def (__feraiseexcept) |
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| 81 | libm_hidden_ver (__feraiseexcept, feraiseexcept) |
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| 82 | versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2); |
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| 83 | |
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