| /* Install given floating-point control modes. x86_64 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> |
| |
| /* All exceptions, including the x86-specific "denormal operand" |
| exception. */ |
| #define FE_ALL_EXCEPT_X86 (FE_ALL_EXCEPT | __FE_DENORM) |
| |
| int |
| fesetmode (const femode_t *modep) |
| { |
| fpu_control_t cw; |
| unsigned int mxcsr; |
| __asm__ ("stmxcsr %0" : "=m" (mxcsr)); |
| /* Preserve SSE exception flags but restore other state in |
| MXCSR. */ |
| mxcsr &= FE_ALL_EXCEPT_X86; |
| if (modep == FE_DFL_MODE) |
| { |
| cw = _FPU_DEFAULT; |
| /* Default MXCSR state has all bits zero except for those |
| masking exceptions. */ |
| mxcsr |= FE_ALL_EXCEPT_X86 << 7; |
| } |
| else |
| { |
| cw = modep->__control_word; |
| mxcsr |= modep->__mxcsr & ~FE_ALL_EXCEPT_X86; |
| } |
| _FPU_SETCW (cw); |
| __asm__ ("ldmxcsr %0" : : "m" (mxcsr)); |
| return 0; |
| } |
