1  /* Control when floating-point expressions are evaluated.  x86 version.
       2     Copyright (C) 2007-2023 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  #ifndef X86_MATH_BARRIERS_H
      20  #define X86_MATH_BARRIERS_H 1
      21  
      22  #ifdef __SSE2_MATH__
      23  # define math_opt_barrier(x)						\
      24    ({ __typeof(x) __x;							\
      25       if (sizeof (x) <= sizeof (double)					\
      26  	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
      27         __asm ("" : "=x" (__x) : "0" (x));				\
      28       else								\
      29         __asm ("" : "=t" (__x) : "0" (x));				\
      30       __x; })
      31  # define math_force_eval(x)						\
      32    do {									\
      33      if (sizeof (x) <= sizeof (double)					\
      34  	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
      35        __asm __volatile ("" : : "x" (x));				\
      36      else								\
      37        __asm __volatile ("" : : "f" (x));				\
      38    } while (0)
      39  #else
      40  # define math_opt_barrier(x)						\
      41    ({ __typeof (x) __x;							\
      42       if (__builtin_types_compatible_p (__typeof (x), _Float128))	\
      43         {								\
      44  	 __x = (x);							\
      45  	 __asm ("" : "+m" (__x));					\
      46         }								\
      47       else								\
      48         __asm ("" : "=t" (__x) : "0" (x));				\
      49       __x; })
      50  # define math_force_eval(x)						\
      51    do {									\
      52      __typeof (x) __x = (x);						\
      53      if (sizeof (x) <= sizeof (double)					\
      54  	|| __builtin_types_compatible_p (__typeof (x), _Float128))	\
      55        __asm __volatile ("" : : "m" (__x));				\
      56      else								\
      57        __asm __volatile ("" : : "f" (__x));				\
      58    } while (0)
      59  #endif
      60  
      61  #endif