94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/*
|
|
* Copyright (C) 2012-2022 Free Software Foundation, Inc.
|
|
*
|
|
* This file is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 3, or (at your option) any
|
|
* later version.
|
|
*
|
|
* This file 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
|
|
* General Public License for more details.
|
|
*
|
|
* Under Section 7 of GPL version 3, you are granted additional
|
|
* permissions described in the GCC Runtime Library Exception, version
|
|
* 3.1, as published by the Free Software Foundation.
|
|
*
|
|
* You should have received a copy of the GNU General Public License and
|
|
* a copy of the GCC Runtime Library Exception along with this program;
|
|
* see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
|
|
* <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef _SOFT_FLOAT
|
|
#include "sfp-machine.h"
|
|
|
|
struct fenv
|
|
{
|
|
unsigned short int __control_word;
|
|
unsigned short int __unused1;
|
|
unsigned short int __status_word;
|
|
unsigned short int __unused2;
|
|
unsigned short int __tags;
|
|
unsigned short int __unused3;
|
|
unsigned int __eip;
|
|
unsigned short int __cs_selector;
|
|
unsigned int __opcode:11;
|
|
unsigned int __unused4:5;
|
|
unsigned int __data_offset;
|
|
unsigned short int __data_selector;
|
|
unsigned short int __unused5;
|
|
} __attribute__ ((gcc_struct));
|
|
|
|
#ifdef __SSE_MATH__
|
|
# define __math_force_eval_div(x, y) \
|
|
do { asm ("" : "+x" (x)); asm volatile ("" : : "x" (x / y)); } while (0)
|
|
#else
|
|
# define __math_force_eval_div(x, y) \
|
|
do { asm ("" : "+t" (x)); asm volatile ("" : : "f" (x / y)); } while (0)
|
|
#endif
|
|
|
|
void
|
|
__sfp_handle_exceptions (int _fex)
|
|
{
|
|
struct fenv temp;
|
|
|
|
if (_fex & FP_EX_INVALID)
|
|
{
|
|
float f = 0.0f;
|
|
__math_force_eval_div (f, f);
|
|
}
|
|
if (_fex & FP_EX_DENORM)
|
|
{
|
|
asm volatile ("fnstenv\t%0" : "=m" (temp));
|
|
temp.__status_word |= FP_EX_DENORM;
|
|
asm volatile ("fldenv\t%0" : : "m" (temp));
|
|
asm volatile ("fwait");
|
|
}
|
|
if (_fex & FP_EX_DIVZERO)
|
|
{
|
|
float f = 1.0f, g = 0.0f;
|
|
__math_force_eval_div (f, g);
|
|
}
|
|
if (_fex & FP_EX_OVERFLOW)
|
|
{
|
|
asm volatile ("fnstenv\t%0" : "=m" (temp));
|
|
temp.__status_word |= FP_EX_OVERFLOW;
|
|
asm volatile ("fldenv\t%0" : : "m" (temp));
|
|
asm volatile ("fwait");
|
|
}
|
|
if (_fex & FP_EX_UNDERFLOW)
|
|
{
|
|
asm volatile ("fnstenv\t%0" : "=m" (temp));
|
|
temp.__status_word |= FP_EX_UNDERFLOW;
|
|
asm volatile ("fldenv\t%0" : : "m" (temp));
|
|
asm volatile ("fwait");
|
|
}
|
|
if (_fex & FP_EX_INEXACT)
|
|
{
|
|
float f = 1.0f, g = 3.0f;
|
|
__math_force_eval_div (f, g);
|
|
}
|
|
}
|
|
#endif
|