sysdeps/s390/fpu/fpu_control.h

   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 %0,0" : "=d" (cw))
  36 #define _FPU_SETCW(cw)  __asm__ __volatile__ ("sfpc  %0,0" : : "d" (cw))
  37
  38 /* Default control word set at startup.  */
  39 extern fpu_control_t __fpu_control;
  40
  41 #endif /* _FPU_CONTROL_H */