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44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Set the FPU control word.
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Copyright (C) 1996-2020 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<https://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <fpu_control.h>
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#include <arm-features.h>
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void
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__setfpucw (fpu_control_t set)
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{
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fpu_control_t fpscr, new_fpscr;
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/* Do nothing if a VFP unit isn't present. */
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if (!ARM_HAVE_VFP)
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return;
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_FPU_GETCW (fpscr);
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/* Preserve the reserved bits, and set the rest as the user
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specified (or the default, if the user gave zero). */
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new_fpscr = fpscr & _FPU_RESERVED;
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new_fpscr |= set & ~_FPU_RESERVED;
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/* Write FPSCR if changed. */
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if (new_fpscr != fpscr)
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_FPU_SETCW (fpscr);
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}
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