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[FAST486]

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No underflows will occur in Fast486FpuAdd when the signs are different, since
the exponent won't be reduced.


svn path=/trunk/; revision=67840
This commit is contained in:
Aleksandar Andrejevic 2015-05-21 00:51:21 +00:00
parent 4e457245b2
commit 1e5d331ec6
1 changed files with 2 additions and 21 deletions
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19
reactos/lib/fast486/fpu.c
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@ -728,30 +728,11 @@ Fast486FpuAdd(PFAST486_STATE State,
{ {
if (TempResult.Mantissa >= FirstAdjusted.Mantissa if (TempResult.Mantissa >= FirstAdjusted.Mantissa
&& TempResult.Mantissa >= SecondAdjusted.Mantissa) && TempResult.Mantissa >= SecondAdjusted.Mantissa)
{
if (TempResult.Exponent == 0)
{
/* Raise the underflow exception */
State->FpuStatus.Ue = TRUE;
if (State->FpuControl.Um)
{
/* Total overflow, return zero */
TempResult.Mantissa = 0ULL;
}
else
{
Fast486FpuException(State);
return FALSE;
}
}
else
{ {
/* Reverse the mantissa */ /* Reverse the mantissa */
TempResult.Mantissa = -(LONGLONG)TempResult.Mantissa; TempResult.Mantissa = -(LONGLONG)TempResult.Mantissa;
} }
} }
}
/* Normalize the result and return it */ /* Normalize the result and return it */
if (!Fast486FpuNormalize(State, &TempResult)) if (!Fast486FpuNormalize(State, &TempResult))