| 1 | /* Store current floating-point environment and clear exceptions. |
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| 2 | Copyright (C) 2000-2022 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 <string.h> |
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| 21 | |
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| 22 | int |
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| 23 | __feholdexcept (fenv_t *envp) |
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| 24 | { |
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| 25 | union { unsigned long long buf[4]; fenv_t env; } clear; |
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| 26 | unsigned long long *bufptr; |
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| 27 | |
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| 28 | /* Store the environment. */ |
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| 29 | bufptr = clear.buf; |
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| 30 | __asm__ ( |
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| 31 | "fstd %%fr0,0(%1)\n" |
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| 32 | : "=m" (clear) : "r" (bufptr) : "%r0" ); |
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| 33 | memcpy (dest: envp, src: &clear.env, n: sizeof (fenv_t)); |
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| 34 | |
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| 35 | /* Clear exception queues */ |
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| 36 | memset (s: clear.env.__exception, c: 0, n: sizeof (clear.env.__exception)); |
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| 37 | /* And set all exceptions to non-stop. */ |
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| 38 | clear.env.__status_word &= ~FE_ALL_EXCEPT; |
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| 39 | /* Now clear all flags */ |
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| 40 | clear.env.__status_word &= ~(FE_ALL_EXCEPT << 27); |
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| 41 | |
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| 42 | /* Load the new environment. Note: fr0 must load last to enable T-bit. */ |
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| 43 | __asm__ ( |
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| 44 | "fldd 0(%0),%%fr0\n" |
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| 45 | : : "r" (bufptr), "m" (clear) : "%r0" ); |
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| 46 | |
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| 47 | return 0; |
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| 48 | } |
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| 49 | |
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| 50 | libm_hidden_def (__feholdexcept) |
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| 51 | weak_alias (__feholdexcept, feholdexcept) |
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| 52 | libm_hidden_weak (feholdexcept) |
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| 53 | |
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