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author | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-12-27 19:51:23 +0000 |
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committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2018-12-27 19:51:23 +0000 |
commit | 9a47d57c4784163dcf838c7461c53de29ca7a61f (patch) | |
tree | 80c130f3da27db25996b0a5f93270df554dcd8b4 /sysdeps/arm/fesetmode.c | |
parent | e0b77a51a258fc7554aeb194ac6b219ee3078f0d (diff) | |
parent | 82dd75a7f436a19047325d62182590c9f9e23a78 (diff) |
Merge branch 't/tls' into refs/top-bases/tschwinge/Roger_Whittaker
Diffstat (limited to 'sysdeps/arm/fesetmode.c')
-rw-r--r-- | sysdeps/arm/fesetmode.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/sysdeps/arm/fesetmode.c b/sysdeps/arm/fesetmode.c new file mode 100644 index 0000000000..1ba825416e --- /dev/null +++ b/sysdeps/arm/fesetmode.c @@ -0,0 +1,45 @@ +/* Install given floating-point control modes. ARM version. + Copyright (C) 2016-2018 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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 <fpu_control.h> +#include <arm-features.h> + +/* NZCV flags, QC bit, IDC bit and bits for IEEE exception status. */ +#define FPU_STATUS_BITS 0xf800009f + +int +fesetmode (const femode_t *modep) +{ + fpu_control_t fpscr, new_fpscr; + + if (!ARM_HAVE_VFP) + /* Nothing to do. */ + return 0; + + _FPU_GETCW (fpscr); + if (modep == FE_DFL_MODE) + new_fpscr = (fpscr & (_FPU_RESERVED | FPU_STATUS_BITS)) | _FPU_DEFAULT; + else + new_fpscr = (fpscr & FPU_STATUS_BITS) | (*modep & ~FPU_STATUS_BITS); + + if (((new_fpscr ^ fpscr) & ~_FPU_MASK_NZCV) != 0) + _FPU_SETCW (new_fpscr); + + return 0; +} |