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[thirdparty/gcc.git] / libgcc / config / loongarch / crtfastmath.c

/* Copyright (C) 2021-2024 Free Software Foundation, Inc.
   Contributed by Loongson Ltd.
   Based on MIPS target for GNU compiler.

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3, or (at your option)
any later version.

GCC is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
License for more details.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License
and a copy of the GCC Runtime Library Exception along with this
program; see the files COPYING3 and COPYING.RUNTIME respectively.
If not, see <http://www.gnu.org/licenses/>.  */

#ifdef __loongarch_hard_float

/* Rounding control.  */
#define _FPU_RC_NEAREST 0x000     /* RECOMMENDED.  */
#define _FPU_RC_ZERO    0x100
#define _FPU_RC_UP      0x200
#define _FPU_RC_DOWN    0x300

/* Enable interrupts for IEEE exceptions.  */
#define _FPU_IEEE     0x0000001F

/* Macros for accessing the hardware control word.  */
#define _FPU_GETCW(cw) __asm__ volatile ("movfcsr2gr %0,$r0" : "=r" (cw))
#define _FPU_SETCW(cw) __asm__ volatile ("movgr2fcsr $r0,%0" : : "r" (cw))

static void __attribute__((constructor))
set_fast_math (void)
{
  unsigned int fcr;

  /* Flush to zero, round to nearest, IEEE exceptions disabled.  */
  fcr = _FPU_RC_NEAREST;

  _FPU_SETCW (fcr);
}

#endif /* __loongarch_hard_float  */