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9e97f239ea
Remove the wordsize-64 implementations by merging them into the main dbl-64 directory. The second patch just moves all wordsize-64 files and removes a few wordsize-64 uses in comments and Implies files. Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>
67 lines
1.8 KiB
C
67 lines
1.8 KiB
C
/* Copyright (C) 2011-2021 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gmail.com>, 2011.
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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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<https://www.gnu.org/licenses/>. */
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#include <inttypes.h>
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#include <math.h>
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#include <math_private.h>
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#include <libm-alias-double.h>
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/*
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* for non-zero, finite x
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* x = frexp(arg,&exp);
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* return a double fp quantity x such that 0.5 <= |x| <1.0
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* and the corresponding binary exponent "exp". That is
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* arg = x*2^exp.
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* If arg is inf, 0.0, or NaN, then frexp(arg,&exp) returns arg
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* with *exp=0.
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*/
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double
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__frexp (double x, int *eptr)
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{
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int64_t ix;
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EXTRACT_WORDS64 (ix, x);
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int32_t ex = 0x7ff & (ix >> 52);
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int e = 0;
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if (__glibc_likely (ex != 0x7ff && x != 0.0))
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{
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/* Not zero and finite. */
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e = ex - 1022;
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if (__glibc_unlikely (ex == 0))
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{
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/* Subnormal. */
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x *= 0x1p54;
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EXTRACT_WORDS64 (ix, x);
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ex = 0x7ff & (ix >> 52);
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e = ex - 1022 - 54;
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}
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ix = (ix & INT64_C (0x800fffffffffffff)) | INT64_C (0x3fe0000000000000);
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INSERT_WORDS64 (x, ix);
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}
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else
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/* Quiet signaling NaNs. */
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x += x;
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*eptr = e;
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return x;
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}
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libm_alias_double (__frexp, frexp)
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