| 1 | /* Install given floating-point environment and raise 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_libc.h> |
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| 20 | #include <fpu_control.h> |
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| 21 | |
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| 22 | int |
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| 23 | __feupdateenv (const fenv_t *envp) |
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| 24 | { |
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| 25 | fenv_union_t old, new; |
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| 26 | |
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| 27 | /* Save the currently set exceptions. */ |
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| 28 | new.fenv = *envp; |
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| 29 | old.fenv = fegetenv_register (); |
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| 30 | |
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| 31 | /* Restore rounding mode and exception enable from *envp and merge |
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| 32 | exceptions. Leave fraction rounded/inexact and FP result/CC bits |
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| 33 | unchanged. */ |
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| 34 | new.l = (old.l & 0xffffffff1fffff00LL) | (new.l & 0x1ff80fff); |
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| 35 | |
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| 36 | __TEST_AND_EXIT_NON_STOP (old.l, new.l); |
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| 37 | __TEST_AND_ENTER_NON_STOP (old.l, new.l); |
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| 38 | |
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| 39 | /* Atomically enable and raise (if appropriate) exceptions set in `new'. */ |
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| 40 | fesetenv_register (new.fenv); |
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| 41 | |
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| 42 | /* Success. */ |
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| 43 | return 0; |
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| 44 | } |
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| 45 | |
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| 46 | #include <shlib-compat.h> |
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| 47 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 48 | strong_alias (__feupdateenv, __old_feupdateenv) |
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| 49 | compat_symbol (libm, __old_feupdateenv, feupdateenv, GLIBC_2_1); |
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| 50 | #endif |
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| 51 | |
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| 52 | libm_hidden_def (__feupdateenv) |
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| 53 | libm_hidden_ver (__feupdateenv, feupdateenv) |
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| 54 | versioned_symbol (libm, __feupdateenv, feupdateenv, GLIBC_2_2); |
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| 55 | |
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