diff options
author | Kito Cheng <kito@andestech.com> | 2017-07-27 11:45:12 +0300 |
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committer | Jeff Johnston <jjohnstn@redhat.com> | 2017-08-17 19:54:56 +0300 |
commit | 7040b2de0883e8346af9c976cd711cf75307e854 (patch) | |
tree | a974232927342683efd84c7ae496dbc7d1362f95 /newlib/libm/machine/riscv/feupdateenv.c | |
parent | 979d467ff6e39ee5c52cf1aac7a6c9c63058141c (diff) |
Add RISC-V port for libm
Contributor list:
- Michael Neilly <mneilly@yahoo.com>
- Kito Cheng <kito.cheng@gmail.com>
Diffstat (limited to 'newlib/libm/machine/riscv/feupdateenv.c')
-rw-r--r-- | newlib/libm/machine/riscv/feupdateenv.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/newlib/libm/machine/riscv/feupdateenv.c b/newlib/libm/machine/riscv/feupdateenv.c new file mode 100644 index 000000000..737095c2b --- /dev/null +++ b/newlib/libm/machine/riscv/feupdateenv.c @@ -0,0 +1,89 @@ +/* + (c) Copyright 2017 Michael R. Neilly + All rights reserved. + + Redistribution and use in source and binary forms, with or without + modification, are permitted provided that the following conditions + are met: + + * Redistributions of source code must retain the above copyright + notice, this list of conditions and the following disclaimer. + + * Redistributions in binary form must reproduce the above copyright + notice, this list of conditions and the following disclaimer in the + documentation and/or other materials provided with the distribution. + + * Neither the names of the copyright holders nor the names of their + contributors may be used to endorse or promote products derived from + this software without specific prior written permission. + + THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS + FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE + COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, + INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, + BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER + CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN + ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE + POSSIBILITY OF SUCH DAMAGE. +*/ + +#include <fenv.h> + +/* This implementation is intended to comply with the following + * specification: + * + * http://pubs.opengroup.org/onlinepubs/9699919799/functions/feupdateenv.html + * + * "The feupdateenv() function shall attempt to save the currently + * raised floating-point exceptions in its automatic storage, attempt + * to install the floating-point environment represented by the object + * pointed to by envp, and then attempt to raise the saved + * floating-point exceptions. The argument envp shall point to an + * object set by a call to feholdexcept() or fegetenv(), or equal a + * floating-point environment macro." + */ + +int feupdateenv(const fenv_t *envp) +{ + +#if __riscv_flen + + /* Get current exception flags */ + + fexcept_t flags; + asm volatile("frflags %0" : "=r"(flags)); + + /* Set the environment as requested */ + + fenv_t fcsr = *envp; /* Environment to install */ + asm volatile("fscsr %0" : : "r"(fcsr)); /* Install environment */ + + /* OR in the saved exception flags */ + + asm volatile("csrs fflags, %0" : : "r"(flags)); + + /* "The feupdateenv() function shall return a zero value if and only + * if all the required actions were successfully carried out." + */ + + return 0; + +#else + + /* For soft float */ + +#if defined FE_NOMASK_ENV && FE_ALL_EXCEPT != 0 + + if (envp == FE_NOMASK_ENV) + return 1; + +#endif + + return 0; + +#endif +} |