| /* Install given floating-point environment. |
| Copyright (C) 1997-2018 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by David Huggins-Daines <dhd@debian.org>, 2000 |
| Based on the m68k version by |
| Andreas Schwab <schwab@suse.de> |
| |
| 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> |
| |
| int |
| __fesetenv (const fenv_t *envp) |
| { |
| union { unsigned long long buf[4]; fenv_t env; } temp; |
| unsigned long long *bufptr; |
| |
| /* Install the environment specified by ENVP. But there are a few |
| values which we do not want to come from the saved environment. |
| Therefore, we get the current environment and replace the values |
| we want to use from the environment specified by the parameter. */ |
| bufptr = temp.buf; |
| __asm__ ( |
| "fstd %%fr0,0(%1)\n" |
| : "=m" (temp) : "r" (bufptr) : "%r0"); |
| |
| temp.env.__status_word &= ~(FE_ALL_EXCEPT |
| | (FE_ALL_EXCEPT << 27) |
| | FE_DOWNWARD); |
| if (envp == FE_DFL_ENV) |
| temp.env.__status_word = 0; |
| else if (envp == FE_NOMASK_ENV) |
| temp.env.__status_word |= FE_ALL_EXCEPT; |
| else |
| temp.env.__status_word |= (envp->__status_word |
| & (FE_ALL_EXCEPT |
| | FE_DOWNWARD |
| | (FE_ALL_EXCEPT << 27))); |
| |
| /* Load the new environment. We use bufptr again since the |
| initial asm has modified the value of the register and here |
| we take advantage of that to load in reverse order so fr0 |
| is loaded last and T-Bit is enabled. */ |
| __asm__ ( |
| "fldd 0(%1),%%fr0\n" |
| : : "m" (temp), "r" (bufptr) : "%r0" ); |
| |
| /* Success. */ |
| return 0; |
| } |
| libm_hidden_def (__fesetenv) |
| weak_alias (__fesetenv, fesetenv) |
| libm_hidden_weak (fesetenv) |