71 lines
2.2 KiB
C
71 lines
2.2 KiB
C
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/* Install given floating-point environment.
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Copyright (C) 1997, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>, 2000
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Based on the m68k version by
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Andreas Schwab <schwab@suse.de>
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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 Library General Public License as
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published by the Free Software Foundation; either version 2 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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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <fenv.h>
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int
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fesetenv (const fenv_t *envp)
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{
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fenv_t temp;
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/* Install the environment specified by ENVP. But there are a few
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values which we do not want to come from the saved environment.
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Therefore, we get the current environment and replace the values
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we want to use from the environment specified by the parameter. */
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{
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fenv_t * _regs = &temp;
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__asm__ (
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"fstd %%fr0,0(%2)\n"
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"fstd,ma %%fr1,8(%2)\n"
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"fstd,ma %%fr2,8(%2)\n"
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"fstd %%fr3,0(%2)\n"
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: "=m" (*_regs), "=r" (_regs) : "1" (_regs));
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}
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temp.__status_word &= ~(FE_ALL_EXCEPT
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| (FE_ALL_EXCEPT << 27)
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| FE_DOWNWARD);
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if (envp == FE_DFL_ENV)
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;
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else if (envp == FE_NOMASK_ENV)
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temp.__status_word |= FE_ALL_EXCEPT;
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else
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temp.__status_word |= (envp->__status_word
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& (FE_ALL_EXCEPT
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| FE_DOWNWARD
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| (FE_ALL_EXCEPT << 27)));
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/* Load the new environment. */
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{
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fenv_t * _regs = &temp + 1;
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__asm__ (
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"fldd,mb -8(%2),%%fr3\n"
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"fldd,mb -8(%2),%%fr2\n"
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"fldd,mb -8(%2),%%fr1\n"
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"fldd -8(%2),%%fr0\n"
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: "=m" (*_regs), "=r" (_regs) : "1" (_regs));
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}
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/* Success. */
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return 0;
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}
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