| 1 | /* Install given floating-point control modes. ARM version. |
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| 2 | Copyright (C) 2016-2024 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 <fpu_control.h> |
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| 21 | #include <arm-features.h> |
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| 22 | |
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| 23 | /* NZCV flags, QC bit, IDC bit and bits for IEEE exception status. */ |
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| 24 | #define FPU_STATUS_BITS 0xf800009f |
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| 25 | |
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| 26 | int |
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| 27 | fesetmode (const femode_t *modep) |
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| 28 | { |
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| 29 | fpu_control_t fpscr, new_fpscr; |
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| 30 | |
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| 31 | if (!ARM_HAVE_VFP) |
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| 32 | /* Nothing to do. */ |
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| 33 | return 0; |
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| 34 | |
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| 35 | _FPU_GETCW (fpscr); |
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| 36 | if (modep == FE_DFL_MODE) |
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| 37 | new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT; |
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| 38 | else |
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| 39 | new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS); |
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| 40 | |
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| 41 | if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) |
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| 42 | _FPU_SETCW (new_fpscr); |
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| 43 | |
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| 44 | return 0; |
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| 45 | } |
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| 46 | |
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