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102 lines
2.8 KiB
C
102 lines
2.8 KiB
C
/* Raise given exceptions.
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Copyright (C) 1997-2013 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by David Huggins-Daines <dhd@debian.org>
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library. If not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <float.h>
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#include <math.h>
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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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int
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feraiseexcept (int excepts)
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{
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/* Raise exceptions represented by EXCEPTS. 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 (excepts & FE_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 (excepts & FE_DIVBYZERO)
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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 (excepts & FE_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 (excepts & FE_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 (excepts & FE_INEXACT)
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{
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double d = M_PI;
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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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/* Success. */
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return 0;
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}
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libm_hidden_def (feraiseexcept)
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