diff options
Diffstat (limited to 'REORG.TODO/sysdeps/aarch64/fpu/fesetenv.c')
-rw-r--r-- | REORG.TODO/sysdeps/aarch64/fpu/fesetenv.c | 78 |
1 files changed, 78 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/aarch64/fpu/fesetenv.c b/REORG.TODO/sysdeps/aarch64/fpu/fesetenv.c new file mode 100644 index 0000000000..9875188735 --- /dev/null +++ b/REORG.TODO/sysdeps/aarch64/fpu/fesetenv.c @@ -0,0 +1,78 @@ +/* Copyright (C) 1997-2017 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> + +int +__fesetenv (const fenv_t *envp) +{ + fpu_control_t fpcr; + fpu_control_t fpcr_new; + fpu_control_t updated_fpcr; + fpu_fpsr_t fpsr; + fpu_fpsr_t fpsr_new; + + _FPU_GETCW (fpcr); + + if ((envp != FE_DFL_ENV) && (envp != FE_NOMASK_ENV)) + { + /* The new FPCR/FPSR are valid, so don't merge the reserved flags. */ + fpcr_new = envp->__fpcr; + + if (fpcr != fpcr_new) + _FPU_SETCW (fpcr_new); + + _FPU_SETFPSR (envp->__fpsr); + return 0; + } + + _FPU_GETFPSR (fpsr); + fpcr_new = fpcr & _FPU_RESERVED; + fpsr_new = fpsr & _FPU_FPSR_RESERVED; + + if (envp == FE_DFL_ENV) + { + fpcr_new |= _FPU_DEFAULT; + fpsr_new |= _FPU_FPSR_DEFAULT; + } + else + { + fpcr_new |= _FPU_FPCR_IEEE; + fpsr_new |= _FPU_FPSR_IEEE; + } + + _FPU_SETFPSR (fpsr_new); + + if (fpcr != fpcr_new) + { + _FPU_SETCW (fpcr_new); + + /* Trapping exceptions are optional in AArch64; the relevant enable + bits in FPCR are RES0 hence the absence of support can be detected + by reading back the FPCR and comparing with the required value. */ + _FPU_GETCW (updated_fpcr); + + return fpcr_new & ~updated_fpcr; + } + + return 0; +} +libm_hidden_def (__fesetenv) +weak_alias (__fesetenv, fesetenv) +libm_hidden_weak (fesetenv) |