1  /* Copyright (C) 2021-2023 Free Software Foundation, Inc.
       2     Contributed by Loongson Ltd.
       3     Based on MIPS target for GNU compiler.
       4  
       5  This file is part of GCC.
       6  
       7  GCC is free software; you can redistribute it and/or modify it
       8  under the terms of the GNU General Public License as published by
       9  the Free Software Foundation; either version 3, or (at your option)
      10  any later version.
      11  
      12  GCC is distributed in the hope that it will be useful, but WITHOUT
      13  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      14  or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
      15  License for more details.
      16  
      17  Under Section 7 of GPL version 3, you are granted additional
      18  permissions described in the GCC Runtime Library Exception, version
      19  3.1, as published by the Free Software Foundation.
      20  
      21  You should have received a copy of the GNU General Public License
      22  and a copy of the GCC Runtime Library Exception along with this
      23  program; see the files COPYING3 and COPYING.RUNTIME respectively.
      24  If not, see <http://www.gnu.org/licenses/>.  */
      25  
      26  #ifdef __loongarch_hard_float
      27  
      28  /* Rounding control.  */
      29  #define _FPU_RC_NEAREST 0x000     /* RECOMMENDED.  */
      30  #define _FPU_RC_ZERO    0x100
      31  #define _FPU_RC_UP      0x200
      32  #define _FPU_RC_DOWN    0x300
      33  
      34  /* Enable interrupts for IEEE exceptions.  */
      35  #define _FPU_IEEE     0x0000001F
      36  
      37  /* Macros for accessing the hardware control word.  */
      38  #define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$r0" : "=r" (cw))
      39  #define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $r0,%0" : : "r" (cw))
      40  
      41  static void __attribute__((constructor))
      42  set_fast_math (void)
      43  {
      44    unsigned int fcr;
      45  
      46    /* Flush to zero, round to nearest, IEEE exceptions disabled.  */
      47    fcr = _FPU_RC_NEAREST;
      48  
      49    _FPU_SETCW (fcr);
      50  }
      51  
      52  #endif /* __loongarch_hard_float  */