106 lines
3.3 KiB
C
106 lines
3.3 KiB
C
|
/* Raise given exceptions.
|
||
|
|
Copyright (C) 2000-2022 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
|
||
|
|
<https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <fenv_libc.h>
|
||
|
|
#include <float.h>
|
||
|
|
#include <math.h>
|
||
|
|
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
fexceptdiv (float d, float e)
|
||
|
|
{
|
||
|
|
__asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
|
||
|
|
}
|
||
|
|
|
||
|
|
static __inline__ void
|
||
|
|
fexceptadd (float d, float e)
|
||
|
|
{
|
||
|
|
__asm__ __volatile__ ("aebr %0,%1" : : "f" (d), "f" (e) );
|
||
|
|
}
|
||
|
|
|
||
|
|
#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
|
||
|
|
static __inline__ void
|
||
|
|
fexceptround (double e)
|
||
|
|
{
|
||
|
|
float d;
|
||
|
|
/* Load rounded from double to float with M3 = round toward 0, M4 = Suppress
|
||
|
|
IEEE-inexact exception.
|
||
|
|
In case of e=0x1p128 and the overflow-mask bit is zero, only the
|
||
|
|
IEEE-overflow flag is set. If overflow-mask bit is one, DXC field is set to
|
||
|
|
0x20 "IEEE overflow, exact".
|
||
|
|
In case of e=0x1p-150 and the underflow-mask bit is zero, only the
|
||
|
|
IEEE-underflow flag is set. If underflow-mask bit is one, DXC field is set
|
||
|
|
to 0x10 "IEEE underflow, exact".
|
||
|
|
This instruction is available with a zarch machine >= z196. */
|
||
|
|
__asm__ __volatile__ ("ledbra %0,5,%1,4" : "=f" (d) : "f" (e) );
|
||
|
|
}
|
||
|
|
#endif
|
||
|
|
|
||
|
|
int
|
||
|
|
__feraiseexcept (int excepts)
|
||
|
|
{
|
||
|
|
/* Raise exceptions represented by EXPECTS. But we must raise only
|
||
|
|
one signal at a time. It is important that if the overflow/underflow
|
||
|
|
exception and the inexact exception are given at the same time,
|
||
|
|
the overflow/underflow exception follows the inexact exception. */
|
||
|
|
|
||
|
|
/* First: invalid exception. */
|
||
|
|
if (FE_INVALID & excepts)
|
||
|
|
fexceptdiv (0.0, 0.0);
|
||
|
|
|
||
|
|
/* Next: division by zero. */
|
||
|
|
if (FE_DIVBYZERO & excepts)
|
||
|
|
fexceptdiv (1.0, 0.0);
|
||
|
|
|
||
|
|
/* Next: overflow. */
|
||
|
|
if (FE_OVERFLOW & excepts)
|
||
|
|
{
|
||
|
|
#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
|
||
|
|
fexceptround (0x1p128);
|
||
|
|
#else
|
||
|
|
/* If overflow-mask bit is zero, both IEEE-overflow and IEEE-inexact flags
|
||
|
|
are set. If overflow-mask bit is one, DXC field is set to 0x2C "IEEE
|
||
|
|
overflow, inexact and incremented". */
|
||
|
|
fexceptadd (FLT_MAX, 1.0e32);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Next: underflow. */
|
||
|
|
if (FE_UNDERFLOW & excepts)
|
||
|
|
{
|
||
|
|
#ifdef HAVE_S390_MIN_Z196_ZARCH_ASM_SUPPORT
|
||
|
|
fexceptround (0x1p-150);
|
||
|
|
#else
|
||
|
|
/* If underflow-mask bit is zero, both IEEE-underflow and IEEE-inexact
|
||
|
|
flags are set. If underflow-mask bit is one, DXC field is set to 0x1C
|
||
|
|
"IEEE underflow, inexact and incremented". */
|
||
|
|
fexceptdiv (FLT_MIN, 3.0);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Last: inexact. */
|
||
|
|
if (FE_INEXACT & excepts)
|
||
|
|
fexceptdiv (2.0, 3.0);
|
||
|
|
|
||
|
|
/* Success. */
|
||
|
|
return 0;
|
||
|
|
}
|
||
|
|
libm_hidden_def (__feraiseexcept)
|
||
|
|
weak_alias (__feraiseexcept, feraiseexcept)
|
||
|
|
libm_hidden_weak (feraiseexcept)
|