| /* Software floating-point emulation. |
| Helper routine for _Q_* routines. |
| Simulate exceptions using double arithmetics. |
| Copyright (C) 1999-2014 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Jakub Jelinek (jj@ultra.linux.cz). |
| |
| 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 <float.h> |
| #include <math.h> |
| #include <assert.h> |
| #include "soft-fp.h" |
| |
| unsigned long long ___Q_zero = 0x0000000000000000ULL; |
| |
| void ___Q_simulate_exceptions(int exceptions) |
| { |
| if (exceptions & FP_EX_INVALID) |
| { |
| float f = 0.0; |
| __asm__ __volatile__ ("fdivs %0, %0, %0" : "+f" (f)); |
| } |
| if (exceptions & FP_EX_DIVZERO) |
| { |
| float f = 1.0, g = 0.0; |
| __asm__ __volatile__ ("fdivs %0, %1, %0" |
| : "+f" (f) |
| : "f" (g)); |
| } |
| if (exceptions & FP_EX_OVERFLOW) |
| { |
| float f = FLT_MAX; |
| __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f)); |
| exceptions &= ~FP_EX_INEXACT; |
| } |
| if (exceptions & FP_EX_UNDERFLOW) |
| { |
| float f = FLT_MIN; |
| __asm__ __volatile__("fmuls %0, %0, %0" : "+f" (f)); |
| exceptions &= ~FP_EX_INEXACT; |
| } |
| if (exceptions & FP_EX_INEXACT) |
| { |
| double d = 1.0, e = M_PI; |
| __asm__ __volatile__ ("fdivd %0, %1, %0" |
| : "+f" (d) |
| : "f" (e)); |
| } |
| } |
