void setFPUControl(unsigned long mipsFlag)
{
#if 0
fprnd_t val= FloatValue[mipsFlag & 0x3];
fp_swap_rnd(val);
#endif
}
int
gsl_ieee_set_mode (int precision, int rounding, int exception_mask)
{
fptrap_t mode = 0 ;
fprnd_t rnd = 0 ;
switch (precision)
{
/* I'm not positive about AIX only supporting default precision rounding,
* but this is the best assumption until it's proven otherwise. */
case GSL_IEEE_SINGLE_PRECISION:
GSL_ERROR ("AIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
case GSL_IEEE_DOUBLE_PRECISION:
GSL_ERROR ("AIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
case GSL_IEEE_EXTENDED_PRECISION:
GSL_ERROR ("AIX only supports default precision rounding",
GSL_EUNSUP) ;
break ;
}
switch (rounding)
{
case GSL_IEEE_ROUND_TO_NEAREST:
rnd = FP_RND_RN ;
fp_swap_rnd (rnd) ;
break ;
case GSL_IEEE_ROUND_DOWN:
rnd = FP_RND_RM ;
fp_swap_rnd (rnd) ;
break ;
case GSL_IEEE_ROUND_UP:
rnd = FP_RND_RP ;
fp_swap_rnd (rnd) ;
break ;
case GSL_IEEE_ROUND_TO_ZERO:
rnd = FP_RND_RZ ;
fp_swap_rnd (rnd) ;
break ;
default:
rnd = FP_RND_RN ;
fp_swap_rnd (rnd) ;
}
/* Turn on all the exceptions apart from 'inexact' */
mode = TRP_INVALID | TRP_DIV_BY_ZERO | TRP_OVERFLOW | TRP_UNDERFLOW ;
if (exception_mask & GSL_IEEE_MASK_INVALID)
mode &= ~ TRP_INVALID ;
if (exception_mask & GSL_IEEE_MASK_DENORMALIZED)
{
/* do nothing */
}
else
{
GSL_ERROR ("AIX does not support the denormalized operand exception. "
"Use 'mask-denormalized' to work around this.",
GSL_EUNSUP) ;
}
if (exception_mask & GSL_IEEE_MASK_DIVISION_BY_ZERO)
mode &= ~ TRP_DIV_BY_ZERO ;
if (exception_mask & GSL_IEEE_MASK_OVERFLOW)
mode &= ~ TRP_OVERFLOW ;
if (exception_mask & GSL_IEEE_MASK_UNDERFLOW)
mode &= ~ TRP_UNDERFLOW ;
if (exception_mask & GSL_IEEE_TRAP_INEXACT)
{
mode |= TRP_INEXACT ;
}
else
{
mode &= ~ TRP_INEXACT ;
}
/* AIX appears to require two steps -- first enable floating point traps
* in general... */
fp_trap(FP_TRAP_SYNC);
/* next, enable the traps we're interested in */
fp_enable(mode);
return GSL_SUCCESS ;
}
