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30891f35fa
We stopped adding "Contributed by" or similar lines in sources in 2012 in favour of git logs and keeping the Contributors section of the glibc manual up to date. Removing these lines makes the license header a bit more consistent across files and also removes the possibility of error in attribution when license blocks or files are copied across since the contributed-by lines don't actually reflect reality in those cases. Move all "Contributed by" and similar lines (Written by, Test by, etc.) into a new file CONTRIBUTED-BY to retain record of these contributions. These contributors are also mentioned in manual/contrib.texi, so we just maintain this additional record as a courtesy to the earlier developers. The following scripts were used to filter a list of files to edit in place and to clean up the CONTRIBUTED-BY file respectively. These were not added to the glibc sources because they're not expected to be of any use in future given that this is a one time task: https://gist.github.com/siddhesh/b5ecac94eabfd72ed2916d6d8157e7dc https://gist.github.com/siddhesh/15ea1f5e435ace9774f485030695ee02 Reviewed-by: Carlos O'Donell <carlos@redhat.com>
96 lines
3.0 KiB
C
96 lines
3.0 KiB
C
/* Return classification value corresponding to argument.
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Copyright (C) 1997-2021 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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<https://www.gnu.org/licenses/>. */
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#include <math.h>
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#include <math_private.h>
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#include <math_ldbl_opt.h>
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/*
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* hx lx
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* +NaN 7ffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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* -NaN fffn nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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* +Inf 7ff0 0000 0000 0000 xxxx xxxx xxxx xxxx
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* -Inf fff0 0000 0000 0000 xxxx xxxx xxxx xxxx
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* +0 0000 0000 0000 0000 xxxx xxxx xxxx xxxx
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* -0 8000 0000 0000 0000 xxxx xxxx xxxx xxxx
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* +normal 0360 0000 0000 0000 0000 0000 0000 0000 (smallest)
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* -normal 8360 0000 0000 0000 0000 0000 0000 0000 (smallest)
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* +normal 7fef ffff ffff ffff 7c8f ffff ffff fffe (largest)
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* +normal ffef ffff ffff ffff fc8f ffff ffff fffe (largest)
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* +denorm 0360 0000 0000 0000 8000 0000 0000 0001 (largest)
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* -denorm 8360 0000 0000 0000 0000 0000 0000 0001 (largest)
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* +denorm 000n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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* -denorm 800n nnnn nnnn nnnn xxxx xxxx xxxx xxxx
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*/
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int
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___fpclassifyl (long double x)
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{
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uint64_t hx, lx;
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int retval = FP_NORMAL;
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double xhi, xlo;
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ldbl_unpack (x, &xhi, &xlo);
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EXTRACT_WORDS64 (hx, xhi);
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if ((hx & 0x7ff0000000000000ULL) == 0x7ff0000000000000ULL) {
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/* +/-NaN or +/-Inf */
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if (hx & 0x000fffffffffffffULL) {
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/* +/-NaN */
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retval = FP_NAN;
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} else {
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retval = FP_INFINITE;
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}
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} else {
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/* +/-zero or +/- normal or +/- denormal */
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if (hx & 0x7fffffffffffffffULL) {
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/* +/- normal or +/- denormal */
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if ((hx & 0x7ff0000000000000ULL) > 0x0360000000000000ULL) {
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/* +/- normal */
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retval = FP_NORMAL;
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} else {
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if ((hx & 0x7ff0000000000000ULL) == 0x0360000000000000ULL) {
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EXTRACT_WORDS64 (lx, xlo);
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if ((lx & 0x7fffffffffffffff) /* lower is non-zero */
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&& ((lx^hx) & 0x8000000000000000ULL)) { /* and sign differs */
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/* +/- denormal */
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retval = FP_SUBNORMAL;
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} else {
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/* +/- normal */
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retval = FP_NORMAL;
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}
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} else {
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/* +/- denormal */
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retval = FP_SUBNORMAL;
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}
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}
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} else {
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/* +/- zero */
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retval = FP_ZERO;
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}
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}
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return retval;
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}
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long_double_symbol (libm, ___fpclassifyl, __fpclassifyl);
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#ifdef __LONG_DOUBLE_MATH_OPTIONAL
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libm_hidden_ver (___fpclassifyl, __fpclassifyl)
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#else
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libm_hidden_def (__fpclassifyl)
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#endif
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