1  /* Copyright (C) 2010-2023 Free Software Foundation, Inc.
       2  
       3     This file is part of GCC.
       4  
       5     GCC is free software; you can redistribute it and/or modify it
       6     under the terms of the GNU General Public License as published by
       7     the Free Software Foundation; either version 3, or (at your option)
       8     any later version.
       9  
      10     GCC is distributed in the hope that it will be useful, but WITHOUT
      11     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      12     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
      13     License for more details.
      14  
      15     Under Section 7 of GPL version 3, you are granted additional
      16     permissions described in the GCC Runtime Library Exception, version
      17     3.1, as published by the Free Software Foundation.
      18  
      19     You should have received a copy of the GNU General Public License
      20     and a copy of the GCC Runtime Library Exception along with this
      21     program; see the files COPYING3 and COPYING.RUNTIME respectively.
      22     If not, see <http://www.gnu.org/licenses/>.  */
      23  
      24  #ifdef __mips_hard_float
      25  
      26  /* Flush denormalized numbers to zero.  */
      27  #define _FPU_FLUSH_TZ   0x1000000
      28  
      29  /* Rounding control.  */
      30  #define _FPU_RC_NEAREST 0x0     /* RECOMMENDED */
      31  #define _FPU_RC_ZERO    0x1
      32  #define _FPU_RC_UP      0x2
      33  #define _FPU_RC_DOWN    0x3
      34  
      35  /* Enable interrupts for IEEE exceptions.  */
      36  #define _FPU_IEEE     0x00000F80
      37  
      38  /* Macros for accessing the hardware control word.  */
      39  #define _FPU_GETCW(cw) __asm__ ("cfc1 %0,$31" : "=r" (cw))
      40  #define _FPU_SETCW(cw) __asm__ ("ctc1 %0,$31" : : "r" (cw))
      41  
      42  static void __attribute__((constructor,nomips16))
      43  set_fast_math (void)
      44  {
      45    unsigned int fcr;
      46  
      47    /* Flush to zero, round to nearest, IEEE exceptions disabled.  */
      48    fcr = _FPU_FLUSH_TZ | _FPU_RC_NEAREST;
      49  
      50    _FPU_SETCW(fcr);
      51  }
      52  
      53  #endif /* __mips_hard_float */