| 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 <fpu_control.h> |
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| 22 | #include <math.h> |
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| 23 | |
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| 24 | int |
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| 25 | __feraiseexcept (int excepts) |
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| 26 | { |
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| 27 | if (excepts == 0) |
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| 28 | return 0; |
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| 29 | |
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| 30 | /* Raise exceptions represented by EXPECTS. */ |
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| 31 | |
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| 32 | if (excepts & FE_INEXACT) |
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| 33 | { |
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| 34 | double d = 1.0, x = 3.0; |
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| 35 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
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| 36 | } |
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| 37 | |
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| 38 | if (excepts & FE_UNDERFLOW) |
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| 39 | { |
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| 40 | long double d = LDBL_MIN, x = 10; |
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| 41 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
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| 42 | } |
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| 43 | |
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| 44 | if (excepts & FE_OVERFLOW) |
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| 45 | { |
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| 46 | long double d = LDBL_MAX; |
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| 47 | __asm__ __volatile__ ("fmul %0, %0" : "+d" (d) : "d" (d)); |
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| 48 | } |
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| 49 | |
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| 50 | if (excepts & FE_DIVBYZERO) |
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| 51 | { |
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| 52 | double d = 1.0, x = 0.0; |
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| 53 | __asm__ __volatile__ ("fdiv %1, %0" : "+d" (d) : "d" (x)); |
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| 54 | } |
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| 55 | |
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| 56 | if (excepts & FE_INVALID) |
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| 57 | { |
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| 58 | double d = HUGE_VAL, x = 0.0; |
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| 59 | __asm__ __volatile__ ("fmul %1, %0" : "+d" (d) : "d" (x)); |
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| 60 | } |
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| 61 | |
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| 62 | { |
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| 63 | /* Restore flag fields. */ |
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| 64 | fpu_control_t cw; |
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| 65 | _FPU_GETCW (cw); |
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| 66 | cw |= (excepts & FE_ALL_EXCEPT); |
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| 67 | _FPU_SETCW (cw); |
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| 68 | } |
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| 69 | |
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| 70 | return 0; |
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| 71 | } |
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| 72 | libm_hidden_def (__feraiseexcept) |
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| 73 | weak_alias (__feraiseexcept, feraiseexcept) |
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| 74 | libm_hidden_weak (feraiseexcept) |
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| 75 | |
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