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glibc/sysdeps/x86_64/fpu/fesetenv.c
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/* Install given floating-point environment. | |
Copyright (C) 2001-2015 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 <assert.h> | |
int | |
__fesetenv (const fenv_t *envp) | |
{ | |
fenv_t temp; | |
/* 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. */ | |
__asm__ ("fnstenv %0\n" | |
"stmxcsr %1" : "=m" (*&temp), "=m" (*&temp.__mxcsr)); | |
if (envp == FE_DFL_ENV) | |
{ | |
temp.__control_word |= FE_ALL_EXCEPT; | |
temp.__control_word &= ~FE_TOWARDZERO; | |
temp.__status_word &= ~FE_ALL_EXCEPT; | |
temp.__eip = 0; | |
temp.__cs_selector = 0; | |
temp.__opcode = 0; | |
temp.__data_offset = 0; | |
temp.__data_selector = 0; | |
/* Clear SSE exceptions. */ | |
temp.__mxcsr &= ~FE_ALL_EXCEPT; | |
/* Set mask for SSE MXCSR. */ | |
temp.__mxcsr |= (FE_ALL_EXCEPT << 7); | |
/* Set rounding to FE_TONEAREST. */ | |
temp.__mxcsr &= ~ 0x6000; | |
temp.__mxcsr |= (FE_TONEAREST << 3); | |
} | |
else if (envp == FE_NOMASK_ENV) | |
{ | |
temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO); | |
temp.__status_word &= ~FE_ALL_EXCEPT; | |
temp.__eip = 0; | |
temp.__cs_selector = 0; | |
temp.__opcode = 0; | |
temp.__data_offset = 0; | |
temp.__data_selector = 0; | |
/* Clear SSE exceptions. */ | |
temp.__mxcsr &= ~FE_ALL_EXCEPT; | |
/* Set mask for SSE MXCSR. */ | |
/* Set rounding to FE_TONEAREST. */ | |
temp.__mxcsr &= ~ 0x6000; | |
temp.__mxcsr |= (FE_TONEAREST << 3); | |
/* Do not mask exceptions. */ | |
temp.__mxcsr &= ~(FE_ALL_EXCEPT << 7); | |
} | |
else | |
{ | |
temp.__control_word &= ~(FE_ALL_EXCEPT | FE_TOWARDZERO); | |
temp.__control_word |= (envp->__control_word | |
& (FE_ALL_EXCEPT | FE_TOWARDZERO)); | |
temp.__status_word &= ~FE_ALL_EXCEPT; | |
temp.__status_word |= envp->__status_word & FE_ALL_EXCEPT; | |
temp.__eip = envp->__eip; | |
temp.__cs_selector = envp->__cs_selector; | |
temp.__opcode = envp->__opcode; | |
temp.__data_offset = envp->__data_offset; | |
temp.__data_selector = envp->__data_selector; | |
temp.__mxcsr = envp->__mxcsr; | |
} | |
__asm__ ("fldenv %0\n" | |
"ldmxcsr %1" : : "m" (temp), "m" (temp.__mxcsr)); | |
/* Success. */ | |
return 0; | |
} | |
libm_hidden_def (__fesetenv) | |
weak_alias (__fesetenv, fesetenv) | |
libm_hidden_weak (fesetenv) |