1  /* Total order operation.  flt-32 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 <math.h>
      20  #include <math_private.h>
      21  #include <libm-alias-float.h>
      22  #include <nan-high-order-bit.h>
      23  #include <stdint.h>
      24  #include <shlib-compat.h>
      25  #include <first-versions.h>
      26  
      27  int
      28  __totalorderf (const float *x, const float *y)
      29  {
      30    int32_t ix, iy;
      31    GET_FLOAT_WORD (ix, *x);
      32    GET_FLOAT_WORD (iy, *y);
      33  #if HIGH_ORDER_BIT_IS_SET_FOR_SNAN
      34    /* For the preferred quiet NaN convention, this operation is a
      35       comparison of the representations of the arguments interpreted as
      36       sign-magnitude integers.  If both arguments are NaNs, invert the
      37       quiet/signaling bit so comparing that way works.  */
      38    if ((ix & 0x7fffffff) > 0x7f800000 && (iy & 0x7fffffff) > 0x7f800000)
      39      {
      40        ix ^= 0x00400000;
      41        iy ^= 0x00400000;
      42      }
      43  #endif
      44    uint32_t ix_sign = ix >> 31;
      45    uint32_t iy_sign = iy >> 31;
      46    ix ^= ix_sign >> 1;
      47    iy ^= iy_sign >> 1;
      48    return ix <= iy;
      49  }
      50  #ifdef SHARED
      51  # define CONCATX(x, y) x ## y
      52  # define CONCAT(x, y) CONCATX (x, y)
      53  # define UNIQUE_ALIAS(name) CONCAT (name, __COUNTER__)
      54  # define do_symbol(orig_name, name, aliasname)		\
      55    strong_alias (orig_name, name)			\
      56    versioned_symbol (libm, name, aliasname, GLIBC_2_31)
      57  # undef weak_alias
      58  # define weak_alias(name, aliasname)			\
      59    do_symbol (name, UNIQUE_ALIAS (name), aliasname);
      60  #endif
      61  libm_alias_float (__totalorder, totalorder)
      62  #if SHLIB_COMPAT (libm, GLIBC_2_25, GLIBC_2_31)
      63  int
      64  attribute_compat_text_section
      65  __totalorder_compatf (float x, float y)
      66  {
      67    return __totalorderf (&x, &y);
      68  }
      69  #undef do_symbol
      70  #define do_symbol(orig_name, name, aliasname)			\
      71    strong_alias (orig_name, name)				\
      72    compat_symbol (libm, name, aliasname,				\
      73  		 CONCAT (FIRST_VERSION_libm_, aliasname))
      74  libm_alias_float (__totalorder_compat, totalorder)
      75  #endif