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93 lines
3.2 KiB
C
93 lines
3.2 KiB
C
/* Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA. */
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#include <fenv_libc.h>
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#include <sysdep.h>
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#include <float.h>
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#include "kernel-features.h"
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#include "kernel_sysinfo.h"
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int
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__feraiseexcept (int excepts)
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{
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INTERNAL_SYSCALL_DECL (err);
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unsigned long t = excepts;
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long r;
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r = INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_RAISE_EXCEPTION, &t);
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#ifndef __ASSUME_IEEE_RAISE_EXCEPTION
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if (!INTERNAL_SYSCALL_ERROR_P (r, err))
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return 0;
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double d;
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/* If we got an error from SSI_IEEE_RAISE_EXCEPTION, assume it means that
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the system call isn't actually implemented. Do the best we can. */
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/* Invalid implemented with 0 / 0 -> NaN. */
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if (excepts & FE_INVALID)
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__asm__ __volatile__ ("divs/su $f31,$f31,%0; trapb" : "=f"(d) : );
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/* Division By Zero implemented with 1 / 0 -> NaN. */
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if (excepts & FE_DIVBYZERO)
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__asm__ __volatile__ ("divs/su %1,$f31,%0; trapb" : "=&f"(d) : "f"(1.0f));
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/* Overflow and underflow cannot be had all by themselves. We can
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generate them with arithmetic, but we always get INEXACT raised
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at the same time. Prepare to undo. */
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if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW)) && !(excepts & FE_INEXACT))
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INTERNAL_SYSCALL (osf_getsysinfo, err, 2, GSI_IEEE_FP_CONTROL, &t);
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/* Overflow implemented with FLT_MAX + FLT_MAX -> Inf. */
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if (excepts & FE_OVERFLOW)
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__asm__ __volatile__ ("adds/sui %1,%1,%0; trapb"
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: "=&f"(d) : "f"(FLT_MAX));
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/* Underflow implemented with FLT_MIN * FLT_MIN -> 0. */
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if (excepts & FE_UNDERFLOW)
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__asm__ __volatile__ ("muls/sui %1,%1,%0; trapb"
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: "=&f"(d) : "f"(FLT_MIN));
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/* Inexact implemented with (long)0.5 -> 0. */
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if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)) == FE_INEXACT)
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__asm__ __volatile__ ("cvttq/svi %1,%0; trapb" : "=&f"(d) : "f"(0.5f));
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/* If we raised inexact when not asked, and inexact was not previously
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raised, then clear that exception. */
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if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW))
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&& !((excepts | t) & FE_INEXACT))
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{
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t |= excepts & SWCR_STATUS_MASK;
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INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_FP_CONTROL, &t);
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}
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#endif /* !__ASSUME_IEEE_RAISE_EXCEPTION */
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return 0;
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}
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#include <shlib-compat.h>
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#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2)
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strong_alias (__feraiseexcept, __old_feraiseexcept)
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compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1);
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#endif
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libm_hidden_ver (__feraiseexcept, feraiseexcept)
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versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2);
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