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54 lines
1.8 KiB
C
54 lines
1.8 KiB
C
/* Raise given exceptions, given the SPEFSCR bits for those exceptions.
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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
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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_libc.h>
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int
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__FERAISEEXCEPT_INTERNAL (int excepts)
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{
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unsigned long f;
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f = fegetenv_register ();
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f |= (excepts & SPEFSCR_ALL_EXCEPT);
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fesetenv_register (f);
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/* Force the operations that cause the exceptions. */
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if ((SPEFSCR_FINVS & excepts) != 0)
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/* 0 / 0 */
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asm volatile ("efsdiv %0,%0,%1" : : "r" (0), "r" (0));
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if ((SPEFSCR_FDBZS & excepts) != 0)
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/* 1.0 / 0.0 */
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asm volatile ("efsdiv %0,%0,%1" : : "r" (1.0F), "r" (0));
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if ((SPEFSCR_FOVFS & excepts) != 0)
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/* Largest normalized number plus itself. */
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asm volatile ("efsadd %0,%0,%1" : : "r" (0x7f7fffff), "r" (0x7f7fffff));
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if ((SPEFSCR_FUNFS & excepts) != 0)
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/* Smallest normalized number times itself. */
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asm volatile ("efsmul %0,%0,%1" : : "r" (0x800000), "r" (0x800000));
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if ((SPEFSCR_FINXS & excepts) != 0)
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/* Smallest normalized minus 1.0 raises the inexact flag. */
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asm volatile ("efssub %0,%0,%1" : : "r" (0x00800000), "r" (1.0F));
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/* Success. */
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return 0;
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}
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