1  /* FPU control word definitions.  Stub version.
       2     Copyright (C) 2000-2023 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 _FPU_CONTROL_H
      20  #define _FPU_CONTROL_H
      21  
      22  #include <features.h>
      23  
      24  /* These bits are reserved are not changed.  */
      25  #define _FPU_RESERVED 0x0707FFFC
      26  
      27  /* The fdlibm code requires no interrupts for exceptions.  Don't
      28     change the rounding mode, it would break long double I/O!  */
      29  #define _FPU_DEFAULT  0x00000000 /* Default value.  */
      30  
      31  /* Type of the control word.  */
      32  typedef unsigned int fpu_control_t;
      33  
      34  /* Macros for accessing the hardware control word.  */
      35  #define _FPU_GETCW(cw)  __asm__ __volatile__ ("efpc %0" : "=d" (cw))
      36  #define _FPU_SETCW(cw)  __asm__ __volatile__ ("sfpc %0" : : "d" (cw))
      37  
      38  /* Default control word set at startup.  */
      39  extern fpu_control_t __fpu_control;
      40  
      41  #endif /* _FPU_CONTROL_H */