| 1 | /* Set floating-point environment exception handling. |
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| 2 | Copyright (C) 2000-2024 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_libc.h> |
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| 20 | #include <math.h> |
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| 21 | #include <fpu_control.h> |
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| 22 | |
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| 23 | int |
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| 24 | fesetexceptflag (const fexcept_t *flagp, int excepts) |
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| 25 | { |
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| 26 | fexcept_t fpc, fpc_new; |
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| 27 | |
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| 28 | /* Get the current environment. We have to do this since we cannot |
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| 29 | separately set the status word. */ |
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| 30 | _FPU_GETCW (fpc); |
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| 31 | |
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| 32 | /* Clear the current exception bits. */ |
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| 33 | fpc_new = fpc & ~((excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT); |
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| 34 | if ((fpc & FPC_NOT_FPU_EXCEPTION) == 0) |
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| 35 | /* Bits 6, 7 of dxc-byte are zero, |
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| 36 | thus bits 0-5 of dxc-byte correspond to the flag-bits. |
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| 37 | Clear given exceptions in dxc-field. */ |
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| 38 | fpc_new &= ~((excepts & FE_ALL_EXCEPT) << FPC_DXC_SHIFT); |
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| 39 | |
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| 40 | /* Set exceptions from flagp in flags-field. */ |
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| 41 | fpc_new |= (*flagp & excepts & FE_ALL_EXCEPT) << FPC_FLAGS_SHIFT; |
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| 42 | |
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| 43 | /* Store the new status word (along with the rest of the environment. |
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| 44 | Possibly new exceptions are set but they won't get executed. */ |
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| 45 | _FPU_SETCW (fpc_new); |
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| 46 | |
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| 47 | /* Success. */ |
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| 48 | return 0; |
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| 49 | } |
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| 50 | |
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