diff options
Diffstat (limited to 'REORG.TODO/sysdeps/i386/fpu/fesetround.c')
| -rw-r--r-- | REORG.TODO/sysdeps/i386/fpu/fesetround.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/i386/fpu/fesetround.c b/REORG.TODO/sysdeps/i386/fpu/fesetround.c new file mode 100644 index 0000000000..a3fa6235c0 --- /dev/null +++ b/REORG.TODO/sysdeps/i386/fpu/fesetround.c @@ -0,0 +1,54 @@ +/* Set current rounding direction. + Copyright (C) 1997-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Ulrich Drepper <drepper@cygnus.com>, 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.h> +#include <unistd.h> +#include <ldsodefs.h> +#include <dl-procinfo.h> + +int +__fesetround (int round) +{ + unsigned short int cw; + + if ((round & ~0xc00) != 0) + /* ROUND is no valid rounding mode. */ + return 1; + + __asm__ ("fnstcw %0" : "=m" (*&cw)); + cw &= ~0xc00; + cw |= round; + __asm__ ("fldcw %0" : : "m" (*&cw)); + + /* If the CPU supports SSE we set the MXCSR as well. */ + if (HAS_CPU_FEATURE (SSE)) + { + unsigned int xcw; + + __asm__ ("stmxcsr %0" : "=m" (*&xcw)); + xcw &= ~0x6000; + xcw |= round << 3; + __asm__ ("ldmxcsr %0" : : "m" (*&xcw)); + } + + return 0; +} +libm_hidden_def (__fesetround) +weak_alias (__fesetround, fesetround) +libm_hidden_weak (fesetround) |