7e3706ea25
unused ily variable. Fix nextafterl on +-__LDBL_MAX__ and +-Inf. Remove unreachable code at the end. 2007-06-01 Steven Munroe <sjmunroe@us.ibm.com> * sysdeps/ieee754/ldbl-128ibm/s_fpclassifyl.c: Correct description of ldbl-128ibm in comment. (fpclassifyl): Correct classification of denormals. * sysdeps/ieee754/ldbl-128ibm/s_nextafterl.c (nextafterl): Correct return value for MIN denormal. Rewrite using long double math too correctly handle denormals and canonicalize the results. 2007-06-05 Jakub Jelinek <jakub@redhat.com> * sysdeps/ieee754/ldbl-128ibm/mpn2ldbl.c (__mpn_construct_long_double): Fix conversion where result ought to be smaller than __LDBL_MIN__, or the low double should be denormal. Fix decision where to negate low double - honor round to even rules. * stdio-common/tst-sprintf2.c: Include string.h. (COMPARE_LDBL): Define. (TEST): Also test whether a string hexadecimal float representation can be parsed back to the number. (main): Add a couple of further tests. 2007-06-04 Jakub Jelinek <jakub@redhat.com>
96 lines
3.1 KiB
C
96 lines
3.1 KiB
C
/* Return classification value corresponding to argument.
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Copyright (C) 1997,1999,2002,2004,2006,2007 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@cygnus.com>, 1997 and
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Jakub Jelinek <jj@ultra.linux.cz>, 1999.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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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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u_int64_t hx, lx;
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int retval = FP_NORMAL;
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GET_LDOUBLE_WORDS64 (hx, lx, x);
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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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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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