102 lines
2.9 KiB
C
102 lines
2.9 KiB
C
/*
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* Copyright (C) 1997-2022 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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#define HUGE_VAL (__builtin_huge_val ())
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/* Please see section 10,
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page 10-5 "Delayed Trapping" in the PA-RISC 2.0 Architecture manual */
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void
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__sfp_handle_exceptions (int _fex)
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{
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/* Raise exceptions represented by _FEX. But we must raise only one
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signal at a time. It is important that if the overflow/underflow
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exception and the divide by zero exception are given at the same
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time, the overflow/underflow exception follows the divide by zero
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exception. */
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/* We do these bits in assembly to be certain GCC doesn't optimize
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away something important, and so we can force delayed traps to
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occur. */
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/* We use "fldd 0(%%sr0,%%sp),%0" to flush the delayed exception */
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/* First: Invalid exception. */
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if (_fex & FP_EX_INVALID)
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{
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/* One example of an invalid operation is 0 * Infinity. */
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double d = HUGE_VAL;
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__asm__ __volatile__ (
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" fcpy,dbl %%fr0,%%fr22\n"
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" fmpy,dbl %0,%%fr22,%0\n"
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" fldd 0(%%sr0,%%sp),%0"
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: "+f" (d) : : "%fr22" );
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}
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/* Second: Division by zero. */
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if (_fex & FP_EX_DIVZERO)
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{
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double d = 1.0;
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__asm__ __volatile__ (
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" fcpy,dbl %%fr0,%%fr22\n"
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" fdiv,dbl %0,%%fr22,%0\n"
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" fldd 0(%%sr0,%%sp),%0"
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: "+f" (d) : : "%fr22" );
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}
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/* Third: Overflow. */
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if (_fex & FP_EX_OVERFLOW)
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{
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double d = __DBL_MAX__;
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__asm__ __volatile__ (
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" fadd,dbl %0,%0,%0\n"
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" fldd 0(%%sr0,%%sp),%0"
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: "+f" (d) );
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}
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/* Fourth: Underflow. */
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if (_fex & FP_EX_UNDERFLOW)
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{
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double d = __DBL_MIN__;
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double e = 3.0;
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__asm__ __volatile__ (
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" fdiv,dbl %0,%1,%0\n"
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" fldd 0(%%sr0,%%sp),%0"
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: "+f" (d) : "f" (e) );
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}
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/* Fifth: Inexact */
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if (_fex & FP_EX_INEXACT)
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{
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double d = 3.14159265358979323846;
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double e = 69.69;
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__asm__ __volatile__ (
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" fdiv,dbl %0,%1,%%fr22\n"
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" fcnvfxt,dbl,sgl %%fr22,%%fr22L\n"
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" fldd 0(%%sr0,%%sp),%%fr22"
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: : "f" (d), "f" (e) : "%fr22" );
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}
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}
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