diff options
Diffstat (limited to 'ports/sysdeps/alpha/fpu/fesetround.c')
| -rw-r--r-- | ports/sysdeps/alpha/fpu/fesetround.c | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/fpu/fesetround.c b/ports/sysdeps/alpha/fpu/fesetround.c new file mode 100644 index 0000000000..86378d4ca9 --- /dev/null +++ b/ports/sysdeps/alpha/fpu/fesetround.c @@ -0,0 +1,42 @@ +/* Set current rounding direction. + Copyright (C) 1997, 2000, 2005 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson <rth@tamu.edu>, 1997 + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library. If not, see + <http://www.gnu.org/licenses/>. */ + +#include <fenv_libc.h> + +int +fesetround (int round) +{ + unsigned long fpcr; + + if (round & ~3) + return 1; + + /* Get the current state. */ + __asm__ __volatile__("excb; mf_fpcr %0" : "=f"(fpcr)); + + /* Set the relevant bits. */ + fpcr = ((fpcr & ~FPCR_ROUND_MASK) + | ((unsigned long)round << FPCR_ROUND_SHIFT)); + + /* Put the new state in effect. */ + __asm__ __volatile__("mt_fpcr %0; excb" : : "f"(fpcr)); + + return 0; +} +libm_hidden_def (fesetround) |