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60 lines
1.8 KiB
C
60 lines
1.8 KiB
C
/* Install given floating-point environment.
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Copyright (C) 1998, 1999, 2000, 2002, 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Alexandre Oliva <aoliva@redhat.com>
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based on corresponding file in the MIPS port.
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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 <shlib-compat.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 cw;
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/* We want to clear all EF bits for the default end IEEE. */
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if (envp == FE_DFL_ENV)
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_FPU_SETFCW (_FPU_DEFAULT|FE_ALL_EXCEPT);
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else if (envp == FE_NOMASK_ENV)
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_FPU_SETFCW (_FPU_IEEE|FE_ALL_EXCEPT);
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else
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{
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fpu_control_t temp;
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_FPU_GETCW (temp);
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cw = *envp;
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/* If EF bits are cleared and the user requests them to be set,
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we have to fail, because there's no way to do it. */
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if (~temp & cw & FE_ALL_EXCEPT)
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return -1;
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/* We clear EF bits by storing a 1 in them, so flip the
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FE_ALL_EXCEPT bits. */
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cw = (cw & ~FE_ALL_EXCEPT) | (~cw & FE_ALL_EXCEPT);
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_FPU_SETFCW (cw);
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}
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/* Success. */
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return 0;
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}
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libm_hidden_ver (__fesetenv, fesetenv)
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versioned_symbol (libm, __fesetenv, fesetenv, GLIBC_2_2);
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