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54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* Set floating-point environment exception handling.
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Copyright (C) 2001-2014 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 <math.h>
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int
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fesetexceptflag (const fexcept_t *flagp, int excepts)
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{
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fenv_t temp;
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unsigned int mxcsr;
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/* XXX: Do we really need to set both the exception in both units?
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Shouldn't it be enough to set only the SSE unit? */
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/* Get the current x87 FPU environment. We have to do this since we
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cannot separately set the status word. */
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__asm__ ("fnstenv %0" : "=m" (*&temp));
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temp.__status_word &= ~(excepts & FE_ALL_EXCEPT);
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temp.__status_word |= *flagp & excepts & FE_ALL_EXCEPT;
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/* Store the new status word (along with the rest of the environment.
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Possibly new exceptions are set but they won't get executed unless
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the next floating-point instruction. */
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__asm__ ("fldenv %0" : : "m" (*&temp));
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/* And now the same for SSE. */
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__asm__ ("stmxcsr %0" : "=m" (*&mxcsr));
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mxcsr &= ~(excepts & FE_ALL_EXCEPT);
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mxcsr |= *flagp & excepts & FE_ALL_EXCEPT;
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__asm__ ("ldmxcsr %0" : : "m" (*&mxcsr));
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/* Success. */
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return 0;
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}
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