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glibc/ports/sysdeps/unix/sysv/linux/alpha/fraiseexcpt.c
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/* Copyright (C) 2004,2006 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library 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 | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library. If not, see | |
<http://www.gnu.org/licenses/>. */ | |
#include <fenv_libc.h> | |
#include <sysdep.h> | |
#include <float.h> | |
#include <kernel-features.h> | |
#include "kernel_sysinfo.h" | |
int | |
__feraiseexcept (int excepts) | |
{ | |
INTERNAL_SYSCALL_DECL (err); | |
unsigned long t = excepts; | |
long r; | |
r = INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_RAISE_EXCEPTION, &t); | |
#ifndef __ASSUME_IEEE_RAISE_EXCEPTION | |
if (!INTERNAL_SYSCALL_ERROR_P (r, err)) | |
return 0; | |
double d; | |
/* If we got an error from SSI_IEEE_RAISE_EXCEPTION, assume it means that | |
the system call isn't actually implemented. Do the best we can. */ | |
/* Invalid implemented with 0 / 0 -> NaN. */ | |
if (excepts & FE_INVALID) | |
__asm__ __volatile__ ("divs/su $f31,$f31,%0; trapb" : "=f"(d) : ); | |
/* Division By Zero implemented with 1 / 0 -> NaN. */ | |
if (excepts & FE_DIVBYZERO) | |
__asm__ __volatile__ ("divs/su %1,$f31,%0; trapb" : "=&f"(d) : "f"(1.0f)); | |
/* Overflow and underflow cannot be had all by themselves. We can | |
generate them with arithmetic, but we always get INEXACT raised | |
at the same time. Prepare to undo. */ | |
if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW)) && !(excepts & FE_INEXACT)) | |
INTERNAL_SYSCALL (osf_getsysinfo, err, 2, GSI_IEEE_FP_CONTROL, &t); | |
/* Overflow implemented with FLT_MAX + FLT_MAX -> Inf. */ | |
if (excepts & FE_OVERFLOW) | |
__asm__ __volatile__ ("adds/sui %1,%1,%0; trapb" | |
: "=&f"(d) : "f"(FLT_MAX)); | |
/* Underflow implemented with FLT_MIN * FLT_MIN -> 0. */ | |
if (excepts & FE_UNDERFLOW) | |
__asm__ __volatile__ ("muls/sui %1,%1,%0; trapb" | |
: "=&f"(d) : "f"(FLT_MIN)); | |
/* Inexact implemented with (long)0.5 -> 0. */ | |
if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW | FE_INEXACT)) == FE_INEXACT) | |
__asm__ __volatile__ ("cvttq/svi %1,%0; trapb" : "=&f"(d) : "f"(0.5f)); | |
/* If we raised inexact when not asked, and inexact was not previously | |
raised, then clear that exception. */ | |
if ((excepts & (FE_OVERFLOW | FE_UNDERFLOW)) | |
&& !((excepts | t) & FE_INEXACT)) | |
{ | |
t |= excepts & SWCR_STATUS_MASK; | |
INTERNAL_SYSCALL (osf_setsysinfo, err, 2, SSI_IEEE_FP_CONTROL, &t); | |
} | |
#endif /* !__ASSUME_IEEE_RAISE_EXCEPTION */ | |
return 0; | |
} | |
#include <shlib-compat.h> | |
#if SHLIB_COMPAT (libm, GLIBC_2_1, GLIBC_2_2) | |
strong_alias (__feraiseexcept, __old_feraiseexcept) | |
compat_symbol (libm, __old_feraiseexcept, feraiseexcept, GLIBC_2_1); | |
#endif | |
libm_hidden_ver (__feraiseexcept, feraiseexcept) | |
versioned_symbol (libm, __feraiseexcept, feraiseexcept, GLIBC_2_2); |