sysdeps/ia64/fpu/fesetmode.c

   1 /* Install given floating-point control modes.  IA64 version.
   2    Copyright (C) 2016-2021 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 #include <fenv.h>
  20
  21 #define FPSR_STATUS 0x1f80UL
  22 #define FPSR_STATUS_ALL ((FPSR_STATUS << 6) | (FPSR_STATUS << 19) \
  23                          | (FPSR_STATUS << 32) | (FPSR_STATUS << 45))
  24
  25 int
  26 fesetmode (const femode_t *modep)
  27 {
  28   femode_t mode;
  29
  30   /* As in fesetenv.  */
  31   if (((fenv_t) modep >> 62) == 0x03)
  32     mode = (femode_t) modep & 0x3fffffffffffffffUL;
  33   else
  34     mode = *modep;
  35
  36   femode_t fpsr;
  37   __asm__ __volatile__ ("mov.m %0=ar.fpsr" : "=r" (fpsr));
  38   fpsr = (fpsr & FPSR_STATUS_ALL) | (mode & ~FPSR_STATUS_ALL);
  39   __asm__ __volatile__ ("mov.m ar.fpsr=%0;;" :: "r" (fpsr));
  40
  41   return 0;
  42 }