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001f7b773c
writes if the FPSCR remains unchanged. 2014-06-24 Wilco <wdijkstr@arm.com> * sysdeps/arm/fclrexcpt.c (feclearexcept): Optimize to avoid unnecessary FPSCR writes. * sysdeps/arm/fedisblxcpt.c (fedisableexcept): Likewise. * sysdeps/arm/feenablxcpt.c (feenableexcept): Likewise. * sysdeps/arm/fsetexcptflg.c (fesetexceptflag): Likewise. * sysdeps/arm/setfpucw.c (__setfpucw): Likewise.
44 lines
1.3 KiB
C
44 lines
1.3 KiB
C
/* Clear given exceptions in current floating-point environment.
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Copyright (C) 1997-2014 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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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <fpu_control.h>
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#include <arm-features.h>
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int
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feclearexcept (int excepts)
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{
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fpu_control_t fpscr, new_fpscr;
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/* Fail if a VFP unit isn't present unless nothing needs to be done. */
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if (!ARM_HAVE_VFP)
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return (excepts != 0);
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_FPU_GETCW (fpscr);
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excepts &= FE_ALL_EXCEPT;
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new_fpscr = fpscr & ~excepts;
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/* Write new exception flags if changed. */
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if (new_fpscr != fpscr)
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_FPU_SETCW (new_fpscr);
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return 0;
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}
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libm_hidden_def (feclearexcept)
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