103 lines
3.0 KiB
C
103 lines
3.0 KiB
C
/* Copyright (C) 2013-2021 Free Software Foundation, Inc.
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This file is part of the GNU Atomic Library (libatomic).
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Libatomic 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
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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more details.
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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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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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#include "libatomic_i.h"
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#define FE_INVALID 0x01
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#define FE_DENORM 0x02
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#define FE_DIVBYZERO 0x04
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#define FE_OVERFLOW 0x08
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#define FE_UNDERFLOW 0x10
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#define FE_INEXACT 0x20
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struct fenv
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{
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unsigned short int __control_word;
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unsigned short int __unused1;
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unsigned short int __status_word;
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unsigned short int __unused2;
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unsigned short int __tags;
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unsigned short int __unused3;
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unsigned int __eip;
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unsigned short int __cs_selector;
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unsigned int __opcode:11;
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unsigned int __unused4:5;
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unsigned int __data_offset;
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unsigned short int __data_selector;
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unsigned short int __unused5;
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} __attribute__ ((gcc_struct));
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#ifdef __SSE_MATH__
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+x" (x)); asm volatile ("" : : "x" (x / y)); } while (0)
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#else
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# define __math_force_eval_div(x, y) \
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do { asm ("" : "+t" (x)); asm volatile ("" : : "f" (x / y)); } while (0)
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#endif
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/* Raise the supported floating-point exceptions from EXCEPTS. Other
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bits in EXCEPTS are ignored. */
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void
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__atomic_feraiseexcept (int excepts)
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{
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struct fenv temp;
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if (excepts & FE_INVALID)
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{
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float f = 0.0f;
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__math_force_eval_div (f, f);
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}
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if (excepts & FE_DENORM)
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{
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_DENORM;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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asm volatile ("fwait");
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}
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if (excepts & FE_DIVBYZERO)
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{
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float f = 1.0f, g = 0.0f;
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__math_force_eval_div (f, g);
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}
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if (excepts & FE_OVERFLOW)
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{
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_OVERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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asm volatile ("fwait");
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}
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if (excepts & FE_UNDERFLOW)
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{
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asm volatile ("fnstenv\t%0" : "=m" (temp));
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temp.__status_word |= FE_UNDERFLOW;
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asm volatile ("fldenv\t%0" : : "m" (temp));
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asm volatile ("fwait");
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}
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if (excepts & FE_INEXACT)
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{
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float f = 1.0f, g = 3.0f;
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__math_force_eval_div (f, g);
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}
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}
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