?? fedisblxcpt.c
字號(hào):
/* Disable floating-point exceptions. Copyright (C) 2001, 2007 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Andreas Jaeger <aj@suse.de>, 2001. 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, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */#include <fenv.h>intfedisableexcept (int excepts){ unsigned short int new_exc, old_exc; unsigned int new; excepts &= FE_ALL_EXCEPT; /* Get the current control word of the x87 FPU. */ __asm__ ("fstcw %0" : "=m" (*&new_exc)); old_exc = (~new_exc) & FE_ALL_EXCEPT; new_exc |= excepts; __asm__ ("fldcw %0" : : "m" (*&new_exc)); /* And now the same for the SSE MXCSR register. */ __asm__ ("stmxcsr %0" : "=m" (*&new)); /* The SSE exception masks are shifted by 7 bits. */ new |= excepts << 7; __asm__ ("ldmxcsr %0" : : "m" (*&new)); return old_exc;}
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