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79 lines
2.0 KiB
C
79 lines
2.0 KiB
C
/* Copyright (C) 1997-2017 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 License as
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published by the Free Software Foundation; either version 2.1 of the
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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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int
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__fesetenv (const fenv_t *envp)
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{
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fpu_control_t fpcr;
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fpu_control_t fpcr_new;
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fpu_control_t updated_fpcr;
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fpu_fpsr_t fpsr;
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fpu_fpsr_t fpsr_new;
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_FPU_GETCW (fpcr);
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if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV))
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{
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/* The new FPCR/FPSR are valid, so don't merge the reserved flags. */
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fpcr_new = envp->__fpcr;
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if (fpcr != fpcr_new)
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_FPU_SETCW (fpcr_new);
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_FPU_SETFPSR (envp->__fpsr);
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return 0;
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}
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_FPU_GETFPSR (fpsr);
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fpcr_new = fpcr & _FPU_RESERVED;
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fpsr_new = fpsr & _FPU_FPSR_RESERVED;
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if (envp == FE_DFL_ENV)
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{
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fpcr_new |= _FPU_DEFAULT;
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fpsr_new |= _FPU_FPSR_DEFAULT;
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}
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else
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{
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fpcr_new |= _FPU_FPCR_IEEE;
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fpsr_new |= _FPU_FPSR_IEEE;
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}
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_FPU_SETFPSR (fpsr_new);
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if (fpcr != fpcr_new)
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{
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_FPU_SETCW (fpcr_new);
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/* Trapping exceptions are optional in AArch64; the relevant enable
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bits in FPCR are RES0 hence the absence of support can be detected
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by reading back the FPCR and comparing with the required value. */
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_FPU_GETCW (updated_fpcr);
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return fpcr_new & ~updated_fpcr;
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}
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return 0;
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}
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libm_hidden_def (__fesetenv)
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weak_alias (__fesetenv, fesetenv)
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libm_hidden_weak (fesetenv)
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