1  /* Total order operation on absolute values.  ldbl-96 version.
       2     Copyright (C) 2016-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #include <float.h>
      20  #include <math.h>
      21  #include <math_private.h>
      22  #include <libm-alias-ldouble.h>
      23  #include <nan-high-order-bit.h>
      24  #include <stdint.h>
      25  #include <shlib-compat.h>
      26  #include <first-versions.h>
      27  
      28  int
      29  __totalordermagl (const long double *x, const long double *y)
      30  {
      31    uint16_t expx, expy;
      32    uint32_t hx, hy;
      33    uint32_t lx, ly;
      34    GET_LDOUBLE_WORDS (expx, hx, lx, *x);
      35    GET_LDOUBLE_WORDS (expy, hy, ly, *y);
      36    expx &= 0x7fff;
      37    expy &= 0x7fff;
      38    if (LDBL_MIN_EXP == -16382)
      39      {
      40        /* M68K variant: for the greatest exponent, the high mantissa
      41  	 bit is not significant and both values of it are valid, so
      42  	 set it before comparing.  For the Intel variant, only one
      43  	 value of the high mantissa bit is valid for each exponent, so
      44  	 this is not necessary.  */
      45        if (expx == 0x7fff)
      46  	hx |= 0x80000000;
      47        if (expy == 0x7fff)
      48  	hy |= 0x80000000;
      49      }
      50  #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
      51  # error not implemented
      52  #endif
      53    return expx < expy || (expx == expy && (hx < hy || (hx == hy && lx <= ly)));
      54  }
      55  #ifdef SHARED
      56  # define CONCATX(x, y) x ## y
      57  # define CONCAT(x, y) CONCATX (x, y)
      58  # define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__)
      59  # define do_symbol(orig_name, name, aliasname)		\
      60    strong_alias (orig_name, name)			\
      61    versioned_symbol (libm, name, aliasname, GLIBC_2_31)
      62  # undef weak_alias
      63  # define weak_alias(name, aliasname)			\
      64    do_symbol (name, UNIQUE_ALIAS (name), aliasname);
      65  #endif
      66  libm_alias_ldouble (__totalordermag, totalordermag)
      67  #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
      68  int
      69  attribute_compat_text_section
      70  __totalordermag_compatl (long double x, long double y)
      71  {
      72    return __totalordermagl (&x, &y);
      73  }
      74  #undef do_symbol
      75  #define do_symbol(orig_name, name, aliasname)			\
      76    strong_alias (orig_name, name)				\
      77    compat_symbol (libm, name, aliasname,				\
      78  		 CONCAT (FIRST_VERSION_libm_, aliasname))
      79  libm_alias_ldouble (__totalordermag_compat, totalordermag)
      80  #endif