| 1 | /* Clear given exceptions in current floating-point environment. |
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| 2 | Copyright (C) 1997-2022 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 <unistd.h> |
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| 21 | #include <ldsodefs.h> |
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| 22 | #include <dl-procinfo.h> |
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| 23 | |
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| 24 | int |
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| 25 | __feclearexcept (int excepts) |
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| 26 | { |
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| 27 | fenv_t temp; |
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| 28 | |
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| 29 | /* Mask out unsupported bits/exceptions. */ |
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| 30 | excepts &= FE_ALL_EXCEPT; |
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| 31 | |
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| 32 | /* Bah, we have to clear selected exceptions. Since there is no |
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| 33 | `fldsw' instruction we have to do it the hard way. */ |
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| 34 | __asm__ ("fnstenv %0" : "=m" (*&temp)); |
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| 35 | |
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| 36 | /* Clear the relevant bits. */ |
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| 37 | temp.__status_word &= excepts ^ FE_ALL_EXCEPT; |
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| 38 | |
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| 39 | /* Put the new data in effect. */ |
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| 40 | __asm__ ("fldenv %0" : : "m" (*&temp)); |
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| 41 | |
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| 42 | /* If the CPU supports SSE, we clear the MXCSR as well. */ |
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| 43 | if (CPU_FEATURE_USABLE (SSE)) |
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| 44 | { |
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| 45 | unsigned int xnew_exc; |
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| 46 | |
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| 47 | /* Get the current MXCSR. */ |
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| 48 | __asm__ ("stmxcsr %0" : "=m" (*&xnew_exc)); |
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| 49 | |
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| 50 | /* Clear the relevant bits. */ |
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| 51 | xnew_exc &= ~excepts; |
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| 52 | |
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| 53 | /* Put the new data in effect. */ |
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| 54 | __asm__ ("ldmxcsr %0" : : "m" (*&xnew_exc)); |
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| 55 | } |
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| 56 | |
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| 57 | /* Success. */ |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |
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| 61 | #include <shlib-compat.h> |
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| 62 | #if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) |
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| 63 | strong_alias (__feclearexcept, __old_feclearexcept) |
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| 64 | compat_symbol (libm, __old_feclearexcept, feclearexcept, GLIBC_2_1); |
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| 65 | #endif |
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| 66 | |
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| 67 | libm_hidden_ver (__feclearexcept, feclearexcept) |
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| 68 | versioned_symbol (libm, __feclearexcept, feclearexcept, GLIBC_2_2); |
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| 69 | |
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