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51 lines
1.6 KiB
C
51 lines
1.6 KiB
C
/* Copyright (C) 2012-2015 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 double log10_high = 0x2.4d7637p0;
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static const double log10_low = 0x7.6aaa2b05ba95cp-28;
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double
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__ieee754_exp10 (double arg)
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{
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int32_t lx;
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double arg_high, arg_low;
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double exp_high, exp_low;
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if (!isfinite (arg))
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return __ieee754_exp (arg);
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if (arg < DBL_MIN_10_EXP - DBL_DIG - 10)
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return DBL_MIN * DBL_MIN;
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else if (arg > DBL_MAX_10_EXP + 1)
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return DBL_MAX * DBL_MAX;
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else if (fabs (arg) < 0x1p-56)
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return 1.0;
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GET_LOW_WORD (lx, arg);
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lx &= 0xf8000000;
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arg_high = arg;
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SET_LOW_WORD (arg_high, lx);
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arg_low = arg - arg_high;
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exp_high = arg_high * log10_high;
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exp_low = arg_high * log10_low + arg_low * M_LN10;
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return __ieee754_exp (exp_high) * __ieee754_exp (exp_low);
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}
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strong_alias (__ieee754_exp10, __exp10_finite)
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