77 lines
2.2 KiB
C
77 lines
2.2 KiB
C
/*
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* Copyright (C) 2012-2018 Free Software Foundation, Inc.
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*
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* This file is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation; either version 3, or (at your option) any
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* later version.
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*
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* This file is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* Under Section 7 of GPL version 3, you are granted additional
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* permissions described in the GCC Runtime Library Exception, version
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* 3.1, as published by the Free Software Foundation.
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*
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* You should have received a copy of the GNU General Public License and
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* a copy of the GCC Runtime Library Exception along with this program;
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* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include "sfp-machine.h"
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void
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__sfp_handle_exceptions (int _fex)
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{
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const float fp_max = __FLT_MAX__;
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const float fp_min = __FLT_MIN__;
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const float fp_1e32 = 1.0e32f;
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const float fp_zero = 0.0;
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const float fp_one = 1.0;
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unsigned fpsr;
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if (_fex & FP_EX_INVALID)
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{
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__asm__ __volatile__ ("fdiv\ts0, %s0, %s0"
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:
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: "w" (fp_zero)
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: "s0");
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__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
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}
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if (_fex & FP_EX_DIVZERO)
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{
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__asm__ __volatile__ ("fdiv\ts0, %s0, %s1"
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:
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: "w" (fp_one), "w" (fp_zero)
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: "s0");
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__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
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}
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if (_fex & FP_EX_OVERFLOW)
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{
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__asm__ __volatile__ ("fadd\ts0, %s0, %s1"
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:
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: "w" (fp_max), "w" (fp_1e32)
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: "s0");
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__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
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}
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if (_fex & FP_EX_UNDERFLOW)
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{
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__asm__ __volatile__ ("fmul\ts0, %s0, %s0"
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:
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: "w" (fp_min)
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: "s0");
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__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
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}
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if (_fex & FP_EX_INEXACT)
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{
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__asm__ __volatile__ ("fsub\ts0, %s0, %s1"
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:
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: "w" (fp_max), "w" (fp_one)
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: "s0");
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__asm__ __volatile__ ("mrs\t%0, fpsr" : "=r" (fpsr));
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}
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}
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