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48 lines
1.4 KiB
C
48 lines
1.4 KiB
C
/* Wrapper to implement llogb in terms of ilogb.
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Copyright (C) 2012-2019 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 <math.h>
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#include <errno.h>
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#include <limits.h>
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#include <math_private.h>
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#include <fenv.h>
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long int
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M_DECL_FUNC (__llogb) (FLOAT x)
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{
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int r = M_SUF (__ieee754_ilogb) (x);
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long int lr = r;
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if (__glibc_unlikely (r == FP_ILOGB0)
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|| __glibc_unlikely (r == FP_ILOGBNAN)
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|| __glibc_unlikely (r == INT_MAX))
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{
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#if LONG_MAX != INT_MAX
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if (r == FP_ILOGB0)
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lr = FP_LLOGB0;
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else if (r == FP_ILOGBNAN)
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lr = FP_LLOGBNAN;
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else
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lr = LONG_MAX;
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#endif
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__set_errno (EDOM);
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__feraiseexcept (FE_INVALID);
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}
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return lr;
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}
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declare_mgen_alias (__llogb, llogb)
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