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49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/* Copyright (C) 2012-2017 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 <math.h>
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#include <math_private.h>
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#include <float.h>
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static const long double log10_high = 0x2.4d763776aaap+0L;
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static const long double log10_low = 0x2.b05ba95b58ae0b4c28a38a3fb4p-48L;
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long double
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__ieee754_exp10l (long double arg)
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{
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union ibm_extended_long_double u;
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long double arg_high, arg_low;
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long double exp_high, exp_low;
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if (!isfinite (arg))
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return __ieee754_expl (arg);
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if (arg < LDBL_MIN_10_EXP - LDBL_DIG - 10)
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return LDBL_MIN * LDBL_MIN;
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else if (arg > LDBL_MAX_10_EXP + 1)
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return LDBL_MAX * LDBL_MAX;
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else if (fabsl (arg) < 0x1p-109L)
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return 1.0L;
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u.ld = arg;
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arg_high = u.d[0].d;
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arg_low = u.d[1].d;
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exp_high = arg_high * log10_high;
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exp_low = arg_high * log10_low + arg_low * M_LN10l;
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return __ieee754_expl (exp_high) * __ieee754_expl (exp_low);
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}
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strong_alias (__ieee754_exp10l, __exp10l_finite)
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